A connecting structure of a truss reinforced concrete laminated slab and a cast-in-place concrete beam and a rotary welding device for construction thereof

Abstract

A truss reinforced concrete composite slab and cast-in-situ concrete beam connecting structure and a rotating welding equipment for construction thereof, the truss reinforced concrete composite slab is provided with multiple rows of stress reinforcement, each row of the stress reinforcement includes a pre-buried section inside the truss reinforced concrete composite slab and an overhanging section extending out of the edge of the truss reinforced concrete composite slab; the end of the pre-buried section is 100-500 mm away from the edge of the truss reinforced concrete composite slab; the truss reinforced concrete composite slab is provided with a blind hole at the end of the pre-buried section away from the edge of the truss reinforced concrete composite slab; the overhanging section is inserted into the blind hole and connected with the pre-buried section through rotating welding, and the overhanging section extends to the inside of the main body of the cast-in-situ concrete beam, and the rotating welding equipment for construction of the connecting structure is also involved.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building connection structures, and in particular to a connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam, and also to a rotary welding equipment for the construction of the connection structure. Background Technology

[0002] In modern construction engineering, prefabricated buildings have gradually become an industry trend due to their numerous advantages such as high efficiency and environmental friendliness. Prefabricated concrete buildings refer to reinforced concrete structures assembled from precast concrete components in part or all of the main structure. Currently, cast-in-place construction is used for beams and columns, while precast composite slabs are commonly used for slabs. As an important component of prefabricated buildings, precast composite slabs are often used in conjunction with cast-in-place concrete frame beams. Truss reinforced concrete composite slabs are the most widely used, but from the perspective of current technology, the connection of truss reinforced concrete composite slabs often adopts the form of a pre-reserved cast-in-place strip of about 300mm width. On-site formwork and supports for the cast-in-place strip are required, resulting in low construction efficiency. Furthermore, the outward reinforcing bars of the precast base slab often collide with the reinforcing bars of adjacent beams, walls, and columns during construction and installation, affecting construction quality and speed. These two problems have long plagued the development of the prefabricated concrete structure industry.

[0003] The current common practice is to lay the bottom formwork of the beams and slabs according to the original cast-in-place structure, then tie the beam reinforcement, and then use deflectors to bend the main beam reinforcement and partially remove the already tied main beam reinforcement. The slab end reinforcement is also bent in a way that resembles prefabricated construction. While the protruding "bearded reinforcement" at one end of the truss reinforced concrete composite slab can effectively extend into the beam, the "bearded reinforcement" at the other end may not be fully extended into the beam during on-site construction. Some reinforcement may be bent or cut off, failing to form an effective connection with the cast-in-place beam, affecting construction quality and posing safety hazards. Furthermore, Chinese patent application (publication number CN208441314U) discloses a prefabricated composite slab and a quick assembly connection structure between the composite slab and the cast-in-place beam. Compared to traditional prefabricated composite slabs, it cuts off the exposed reinforcement and connects the support members and the external reinforcement through a secondary mechanical connection using connectors. This achieves a detachable connection between the support members and the external components, solving the technical problem of cross-conflict and installation difficulties when connecting the prefabricated composite slab reinforcement to the main reinforcement of the cast-in-place beam. However, mechanical connections require threading at the ends of the reinforcing bars and also require additional threaded sleeves, which increases installation costs and affects installation efficiency. More importantly, mechanical connections have relatively poor overall integrity and are prone to loosening during construction (such as concrete vibration), which is extremely detrimental to construction quality.

[0004] Furthermore, currently, apart from the connection of the protruding steel bars between the precast layer of the cast-in-place concrete beam and the precast layer of the reinforced concrete composite slab, there are no other connection measures between the precast layer itself and the cast-in-place concrete beam. Under the action of seismic forces, the protruding steel bars are prone to slippage or pull-out, which is not conducive to the seismic resistance of the building structure. Summary of the Invention

[0005] The purpose of this utility model is to provide a connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam, and also to provide a rotary welding equipment for its construction. This equipment can solve the technical problems mentioned in the background art, achieve convenient and efficient construction, effectively improve the integrity of the steel reinforcement connection, ensure construction quality, and improve the seismic performance of the structural connection structure.

[0006] This utility model provides a connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam. The truss reinforced concrete composite slab is provided with multiple rows of reinforcing bars. Each row of reinforcing bars includes a pre-embedded section inside the truss reinforced concrete composite slab and an extended section extending out of the edge of the truss reinforced concrete composite slab. The distance between the end of the embedded section and the edge of the truss reinforced concrete composite slab is 100-500mm; the truss reinforced concrete composite slab is provided with blind holes at the end of the embedded section and the edge of the truss reinforced concrete composite slab. The extended section is inserted into the blind hole and connected to the pre-embedded section by rotational welding. The extended section extends into the main body of the cast-in-place concrete beam.

[0007] Preferably, the distances between the ends of the embedded sections of two adjacent rows of reinforcing bars and the edge of the truss reinforced concrete composite slab are different, so that the connection positions of the embedded sections and overhangs of multiple rows of reinforcing bars are located on multiple different sections of the truss reinforced concrete composite slab.

[0008] Preferably, a pre-embedded sleeve is provided in the blind hole. The pre-embedded sleeve includes a sleeve body. A concave, trumpet-shaped partition is provided in the middle of the sleeve body. A reinforcing bar through hole is provided in the middle of the partition. The diameter of the reinforcing bar through hole is slightly larger than the diameter of the stressed reinforcing bar. A grouting hole is provided on the partition body.

[0009] Preferably, the inner end of the sleeve body is provided with a concave flared end plate, and a steel bar through hole is provided in the middle of the end. The diameter of the steel bar through hole is slightly larger than the diameter of the stressed steel bar and a sealing layer is provided at the edge. A grouting pipe is provided at the upper end of the sleeve body near the end plate, and an exhaust pipe is provided at the upper end of the sleeve body between the end plate and the partition. The grouting pipe and the exhaust pipe extend to the top of the truss reinforced concrete composite slab.

[0010] Preferably, the embedded section has a frustum-shaped groove on the side near the cast-in-place concrete beam, and a first annular shoulder is provided on the outside of the frustum-shaped groove. The extended section has a frustum-shaped protrusion on the side away from the cast-in-place concrete beam, and a second annular shoulder is provided on the outside of the frustum-shaped protrusion. The size of the frustum-shaped protrusion is slightly larger than the size of the frustum-shaped groove.

[0011] Preferably, the surfaces of the frustum-shaped protrusion and the frustum-shaped groove are rough surfaces.

[0012] This utility model also provides a rotary welding equipment for the construction of a connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam, as described above. The rotary welding equipment is used to rotary weld the extended section to the embedded section. The rotary welding equipment includes a machine body, and the machine body is equipped with an electric chuck and a drive device. The drive device is located at the top of the machine body, and the electric chuck is located at the bottom of the machine body. The drive device and the electric chuck are connected by a transmission mechanism so that the drive device drives the electric chuck to rotate at high speed. The bottom of the machine body can be inserted into the connection node between the truss reinforced concrete composite slab and the cast-in-place concrete beam to facilitate the clamping of the end of the extended section by the electric clamp.

[0013] Preferably, the machine body includes a gearbox at the bottom, an electric chuck rotatably mounted on the right end of the gearbox, a riser at the upper end of the gearbox, a handle at the top of the riser, and a mounting plate on one side of the upper part of the riser. The bottom of the mounting plate is higher than the top surface of the cast-in-place concrete beam. The drive device is mounted on the mounting plate, and the transmission mechanism is located in the middle of the riser. The drive device is connected to the transmission mechanism, and the transmission mechanism is connected to the gearbox. The gearbox can drive the electric chuck to rotate.

[0014] Preferably, the transmission mechanism includes a transmission shaft, a first bearing, a second bearing, and a first bevel gear. The transmission shaft is installed in the middle of the riser via the first and second bearings. The bottom end of the transmission shaft is connected to a gearbox. The first bevel gear is provided in the middle of the transmission shaft. The driving device is a high-speed motor. The drive shaft of the high-speed motor passes through the riser, and a second bevel gear is provided at the end of the drive shaft. The first bevel gear meshes with the second bevel gear.

[0015] Preferably, the left side end and the bottom end of the gearbox are respectively provided with a jacking telescopic device and a height adjustment device. The jacking telescopic device includes a first electric telescopic rod, and the telescopic end of the first electric telescopic rod is provided with a top plate. The height adjustment device includes a second electric telescopic rod, and the telescopic end of the second electric telescopic rod is provided with a support plate. The bottom of the support plate is provided with a rolling structure.

[0016] The technical effects that this utility model can achieve are: (1) The truss reinforced concrete composite slab of this utility model has blind holes at the end of the pre-embedded section at the edge of the truss reinforced concrete composite slab; the blind holes, in conjunction with the aforementioned reserved distance, allow concrete to enter the blind holes during the casting of the cast-in-place concrete beam. Combined with the protruding reinforcing bars, this forms a structure inserted into the precast layer of the truss reinforced concrete composite slab, creating a similar effect to pile foundations. This significantly improves the overall integrity of the connection structure and effectively enhances its seismic performance. When the truss reinforced concrete composite slab is installed on site, after it is hoisted into place, the protruding section is inserted into the blind holes and connected to the pre-embedded section by rotary welding. The protruding section extends into the main body of the cast-in-place concrete beam. The connection between the extended section and the embedded section of this invention is located inside a blind hole, and is affected by the bottom formwork of the cast-in-place concrete beam, making it impossible to effectively weld with a conventional welding gun. This invention cleverly utilizes rotary welding to connect the extended section and the embedded section. The rotary welding process ensures uniform heating of the welded area, which helps to form a uniform weld and reduces the possibility of defects such as porosity and slag inclusions in the weld, greatly improving the integrity of the reinforcing steel. At the same time, the rotary welding method is fast and efficient, improving on-site construction efficiency.

[0017] (2) In this utility model, the embedded sections and extended sections of two adjacent rows of reinforcing bars are connected at different cross sections, while the embedded sections and extended sections of two intermittent rows of reinforcing bars are connected at the same cross section. This arrangement can avoid the connection welds of the embedded sections and extended sections being located at the same cross section, thus preventing the formation of obvious weak surfaces.

[0018] (3) The pre-embedded sleeve of this utility model can serve as a mold to facilitate the formation of blind hole structures at the edges of the prefabrication of the truss reinforced concrete composite slab. On the other hand, it can facilitate grouting at the connection of the stressed reinforcing bars to improve the compactness of the piles, thereby strengthening the connection strength between the truss reinforced concrete composite slab and the cast-in-place concrete beam. When the truss reinforced concrete composite slab is prefabricated, the sleeve body is inserted into the end of the pre-embedded section. During the insertion process, the concave flared end plate can play a centering guiding role, ensuring that the pre-embedded section is located in the center of the sleeve body after installation. The sealing layer at the edge of the reinforcing bar perforation in the middle of the end plate can play a sealing role, preventing concrete slurry from seeping into the sleeve body during the prefabrication of the truss reinforced concrete composite slab. The concave flared partition can play a centering guiding role when the extended section is inserted into the sleeve body, similarly ensuring that the extended section is also located in the center of the sleeve body after insertion, realizing rapid alignment between the extended section and the pre-embedded section. The grout passage holes on the main body of the partition plate facilitate the passage of concrete grout and cement grout for cast-in-place concrete beams. The vent holes are used to expel air from the inside of the sleeve body to prevent negative pressure from forming inside the embedded sleeve during concrete beam casting and grouting.

[0019] (4) This utility model innovatively proposes a rotary welding device that separates the drive device and the electric clamp, effectively reducing the size of the steel bar clamping part of the rotary welding device, so that the rotary welding device can be used to insert into the relatively narrow space of the cast-in-place concrete beam, thereby clamping the protruding section to achieve rotary welding with the pre-embedded section.

[0020] (5) This utility model ingeniously sets up a riser structure and sets the transmission mechanism inside the riser structure to avoid interference between the steel bars inside the cast-in-place concrete beam and the transmission mechanism, thereby affecting the operation of the equipment. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the truss reinforced concrete composite slab of Embodiment 1 of this utility model; Figure 2 This is a partial schematic diagram of the truss reinforced concrete composite slab of Embodiment 1 of this utility model; Figure 3 This is Embodiment 1 of the present utility model. Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the three-dimensional structure of the pre-embedded sleeve in Embodiment 1 of this utility model; Figure 5This is a schematic diagram of the structure of a rotary welding device used in the construction of a connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam, according to Embodiment 2 of this utility model.

[0023] in: 1. Reinforcing steel bar; 11. Extended section; 111. Frustum-shaped protrusion; 112. Second annular shoulder; 12. Embedded section; 121. Frustum-shaped groove; 122. First annular shoulder; 2. Truss reinforced concrete composite slab; 3. Embedded sleeve; 31. Sleeve body; 311. End plate; 312. Partition plate; 32. Grouting pipe; 33. Vent pipe; 4. Height adjustment device; 41. Second electric telescopic rod; 42. Support plate; 43. Rolling structure; 5. Machine body; 50. Electric chuck; 51. Gearbox; 52. Riser; 521. Handle; 53. Drive unit; 531. High-speed motor; 532. Second bevel gear; 533. Mounting plate; 54. Transmission mechanism; 540. Drive shaft; 541. First bevel gear; 542. First bearing; 543. Second bearing; 6. Jacking telescopic device; 61. First electric telescopic rod; 62. Top plate. Detailed Implementation

[0024] The purpose, advantages, and features of this utility model will be explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this utility model, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model. Example 1:

[0025] Example 1 provides a connection structure between a truss reinforced concrete composite slab 2 and a cast-in-place concrete beam, such as... Figure 1-3 As shown, the truss reinforced concrete composite slab 2 is provided with multiple rows of reinforcing bars 1. Each row of reinforcing bars 1 includes a pre-embedded section 12 inside the truss reinforced concrete composite slab 2 and an extended section 11 extending out of the edge of the truss reinforced concrete composite slab 2. The distance between the end of the embedded section 12 and the edge of the truss reinforced concrete composite slab 2 is 100-500mm; the truss reinforced concrete composite slab 2 is provided with blind holes at the end of the embedded section and the edge of the truss reinforced concrete composite slab. The extended section 11 is inserted into the blind hole and connected to the embedded section by rotational welding. The extended section extends into the main body of the cast-in-place concrete beam.

[0026] The truss reinforced concrete composite slab 2 has blind holes at the end of the pre-embedded section 12, at a distance from the edge of the truss reinforced concrete composite slab 2. With the aforementioned reserved distance, the concrete can enter the blind holes when the cast-in-place concrete beam is poured. Together with the protruding reinforcing bars, it can form a structure that inserts into the precast layer of the truss reinforced concrete composite slab 2, forming a function similar to piles. This can greatly improve the integrity of the connection structure and effectively improve the seismic performance of the connection structure.

[0027] Before the truss reinforced concrete composite slab 2 is hoisted on site, the embedded section 12 and the extended section 11 are separated from each other; that is, the embedded section 12 and the extended section 11 are two independent components before installation, which facilitates the prefabrication and transportation of the truss reinforced concrete composite slab 2.

[0028] When the reinforced concrete composite slab 2 is installed on site, after it is hoisted into place, the extended section 11 is inserted into the blind hole and connected to the embedded section 12 by rotary welding. The extended section 11 extends into the interior of the cast-in-place concrete beam. The connection between the extended section 11 and the embedded section 12 is located inside the blind hole, and due to the influence of the bottom formwork of the cast-in-place concrete beam, conventional welding guns cannot effectively perform welding. This invention cleverly utilizes rotary welding to connect the extended section 11 and the embedded section 12. The rotation process ensures uniform heating of the welded area, helping to form a uniform weld and reducing the possibility of defects such as porosity and slag inclusions in the weld, greatly improving the integrity of the reinforcing steel 1. Simultaneously, rotary welding is fast and efficient, improving on-site construction efficiency.

[0029] Furthermore, the distances between the ends of the embedded sections 12 of adjacent rows of reinforcing bars 1 and the edge of the truss reinforced concrete composite slab 2 are different, so that the connection positions of the embedded sections 12 and the extended sections 11 of multiple rows of reinforcing bars 1 are located on multiple different sections of the truss reinforced concrete composite slab 2. In this embodiment, the connection positions of the embedded sections 12 and the extended sections 11 of two adjacent rows of reinforcing bars 1 are located on different sections, while the connection positions of the embedded sections 12 and the extended sections 11 of two rows of reinforcing bars 1 that are spaced apart are located on the same section. This arrangement can avoid the connection welds of the embedded sections 12 and the extended sections 11 being located on the same section, thus preventing the formation of obvious weak points.

[0030] Furthermore, such as Figure 4 As shown, a pre-embedded sleeve 3 is provided in the blind hole. The pre-embedded sleeve 3 includes a sleeve body 31. A concave flared baffle 312 is provided in the middle of the sleeve body 31. A reinforcing bar through hole is provided in the middle of the baffle 312. The diameter of the reinforcing bar through hole is slightly larger than the diameter of the stressed reinforcing bar 1. A grouting hole is provided on the baffle 312 body.

[0031] The inner end of the sleeve body 31 is provided with a concave flared end plate 311. A steel bar through hole is provided in the middle of the end. The diameter of the steel bar through hole is slightly larger than the diameter of the stressed steel bar 1 and a sealing layer is provided at the edge. A grouting pipe 32 is provided on the upper end of the sleeve body 31 near the end plate 311. An exhaust pipe 33 is provided on the upper end of the sleeve body 31 between the end plate 311 and the partition plate 312. The grouting pipe 32 and the exhaust pipe 33 extend to the top of the truss reinforced concrete composite slab 2.

[0032] The pre-embedded sleeve 3 can serve as a mold to facilitate the formation of blind hole structures at the edges of the truss reinforced concrete composite slab 2 during prefabrication. On the other hand, it can facilitate grouting at the connection of the stressed reinforcing bars 1 to improve the compactness of the piles, thereby strengthening the connection strength between the truss reinforced concrete composite slab 2 and the cast-in-place concrete beam.

[0033] During the prefabrication of the truss reinforced concrete composite slab 2, the sleeve body 31 is inserted into the end of the embedded section 12. During the insertion process, the concave, trumpet-shaped end plate 311 serves as a centering guide, ensuring that the embedded section 12 is located in the center of the sleeve body 31 after installation. The sealing layer at the edge of the steel reinforcement perforation in the middle of the end plate 311 provides a sealing function, preventing concrete slurry from seeping into the sleeve body 31 during the prefabrication of the truss reinforced concrete composite slab 2.

[0034] The concave, trumpet-shaped partition 312 can play a centering and guiding role when the extended section 11 is inserted into the sleeve body 31, and also ensure that the extended section 11 is located in the center of the sleeve body 31 after being inserted into the sleeve body 31, so as to achieve rapid alignment between the extended section 11 and the pre-embedded section 12.

[0035] The grout passage hole on the main body of the partition plate 312 facilitates the passage of concrete grout and cement grout for the cast-in-place concrete beam. The vent hole is used to discharge air from the inside of the sleeve body 31 to prevent negative pressure from forming inside the embedded sleeve 3 during the pouring of concrete beam and grouting.

[0036] like Figure 3 As shown, a frustum-shaped groove 121 is provided on the side of the embedded section 12 near the cast-in-place concrete beam, and a first annular shoulder 122 is provided on the outer side of the frustum-shaped groove 121. A frustum-shaped protrusion 111 is provided on the side of the extended section 11 away from the cast-in-place concrete beam, and a second annular shoulder 112 is provided on the outer side of the frustum-shaped protrusion 111.

[0037] The frustum-shaped protrusion 111 and the frustum-shaped groove 121 are configured together, and at the same time, they are configured with the first annular shoulder 122 and the second annular shoulder 112. On the one hand, this achieves precise alignment between the embedded section 12 and the extended section 11, and on the other hand, it increases the contact surface of rotational friction and improves the efficiency of rotational welding.

[0038] Furthermore, the size of the frustum-shaped protrusion is slightly larger than the size of the frustum-shaped groove 121. The surfaces of the frustum-shaped protrusion 111 and the frustum-shaped groove 121 are rough surfaces, which can effectively increase the frictional heating effect, thereby improving the rotary welding efficiency and ensuring the welding quality.

[0039] Implementation 2:

[0040] like Figure 5 As shown, this utility model also provides a rotary welding device for constructing the connection structure between a truss reinforced concrete composite slab 2 and a cast-in-place concrete beam, as described in Embodiment 1.

[0041] The rotary welding equipment is used to rotary weld the extended section 11 to the embedded section 12. The rotary welding equipment includes a machine body 5, and an electric chuck 50 and a drive device 53 are provided on the machine body 5. The drive device 53 is located at the top of the machine body 5, and the electric chuck 50 is located at the bottom of the machine body 5. The drive device 53 and the electric chuck 50 are connected by a transmission mechanism 54 so that the drive device 53 drives the electric chuck 50 to rotate at high speed. The bottom end of the machine body 5 can be inserted into the connection node between the truss reinforced concrete composite slab 2 and the cast-in-place concrete beam so that the electric clamp 50 can clamp the end of the extended section 11.

[0042] In this embodiment, the drive device 53 and the electric chuck 50 are set separately, which effectively reduces the size of the steel bar clamping part of the rotary welding equipment, so that the rotary welding equipment can be used to insert into the relatively narrow space of the cast-in-place concrete beam, and thus can clamp the protruding section to achieve rotary welding.

[0043] The machine body 5 includes a gearbox 51 at the bottom. The specific structure of the gearbox 51 can adopt an existing conventional structure, which will not be described in detail here. An electric chuck 50 is rotatably installed at the right end of the gearbox 51. A vertical tube 52 is installed at the upper end of the gearbox 51. A handle 521 is installed at the top of the vertical tube 52. The handle 521 is convenient for construction personnel to hold and operate. An operation button can be installed on the handle 521 for controlling the rotary welding equipment.

[0044] An mounting plate 533 is provided on one side of the upper part of the riser 52. The bottom of the mounting plate 533 is higher than the top surface of the cast-in-place concrete beam. The driving device 53 is mounted on the mounting plate 533. The transmission mechanism 54 is located in the middle of the riser 52. The driving device 53 is connected to the transmission mechanism 54. The transmission mechanism 54 is connected to the gearbox 51. The gearbox 51 can drive the electric chuck 50 to rotate.

[0045] The transmission mechanism 54 includes a transmission shaft 540, a first bearing 542, a second bearing 543, and a first bevel gear 541. The transmission shaft 540 is installed in the middle of the riser 52 via the first bearing 542 and the second bearing 543. The bottom end of the transmission shaft 540 is connected to the gearbox 51. The first bevel gear 541 is provided in the middle of the transmission shaft 540. The driving device 53 is a high-speed motor 531. The drive shaft of the high-speed motor 531 passes through the riser 52, and the end of the drive shaft is provided with a second bevel gear 532. The first bevel gear 541 meshes with the second bevel gear 532.

[0046] The transmission mechanism 54 effectively ensures that the drive device 53 and the electric chuck 50 can be set separately. In addition, it should be particularly emphasized that the present invention cleverly sets up the riser 52 structure and sets the transmission mechanism 54 inside the riser 52 structure, so as to avoid interference between the steel bars inside the cast-in-place concrete beam and the transmission mechanism 54, thereby affecting the operation of the equipment.

[0047] The left and bottom ends of the gearbox 51 are respectively equipped with a jacking telescopic device 6 and a height adjustment device 4. The jacking telescopic device 6 includes a first electric telescopic rod 61, and the telescopic end of the first electric telescopic rod 61 is equipped with a first electric telescopic rod 62. The jacking telescopic device 6 can provide jacking force during rotary welding, thereby improving the rotary welding effect. The first electric telescopic rod 62 can be abutted against the longitudinal reinforcement or side formwork of the cast-in-place concrete beam. The height adjustment device 4 can adjust the height of the electric chuck 50 to accommodate reinforcing bars 1 of different heights, thereby expanding the applicability of the rotary welding equipment.

[0048] The height adjustment device 4 includes a second electric telescopic rod 41, with a support plate 42 at the telescopic end of the second electric telescopic rod 41. A rolling structure 43 is provided at the bottom of the support plate 42. The rolling structure 43 can be a roller or a ball bearing structure. The support plate 42 is supported on the bottom formwork of the cast-in-place concrete beam. The rolling structure 43 prevents the height adjustment device 4 from affecting the operation of the jacking telescopic device 6. Example 3:

[0049] Example 3 provides a construction method for the connection structure between the truss reinforced concrete composite slab 2 and the cast-in-place concrete beam as described above, including the following steps: 1. Prefabricate the truss reinforced concrete composite slab 2, and provide a pre-embedded sleeve 3 at the edge of the truss reinforced concrete composite slab 2; 2. The cast-in-place concrete beam is supported by formwork, and a reinforcing cage is placed in the formwork cavity. The reinforcing cage has a gap at the position of the extended section 11 for the insertion of a rotary welding device. 3. Lifting truss reinforced concrete composite slab 2; 4. Insert the protruding section into the pre-embedded sleeve 3; 5. Insert the rotary welding equipment into the reinforcement cage of the cast-in-place concrete beam through the gap; 6. Adjust the height of the electric chuck 50 by the height adjustment device 4 so that the electric chuck 50 can firmly clamp the outer end of the protruding section. 7. Start the high-speed motor 531 to drive the electric chuck 50 to rotate the extension section 11 at high speed. Use the jacking telescopic device 6 to drive the extension section 11 to slowly jack in until the rotational welding of the extension section and the pre-embedded section 12 is completed. 8. Repeat steps 5-7 to complete the installation of all protruding sections; 9. Pour and vibrate the cast-in-place concrete beam. During the vibration process, the concrete slurry can enter the interior of the pre-embedded sleeve 3. 10 Grouting is carried out into the pre-embedded sleeve 3 through the grouting pipe 32 until grout sees slurry seeping into the exhaust pipe 33; A floor slab composite layer is poured on top of the truss reinforced concrete composite slab 2.

[0050] The construction method for the connection structure between the truss reinforced concrete composite slab 2 and the cast-in-place concrete beam provided in Example 3 is convenient and efficient. It can effectively solve the problem that the protruding steel bars at both ends of the composite slab can be conveniently and reliably inserted into the beam, thereby ensuring construction quality, making the building safer and more reliable, and improving the seismic performance of the structure.

[0051] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A connection structure between a truss-reinforced concrete composite slab and a cast-in-place concrete beam, wherein the truss-reinforced concrete composite slab is provided with multiple rows of reinforcing bars, each row of reinforcing bars including a pre-embedded section inside the truss-reinforced concrete composite slab and an overhanging section extending beyond the edge of the truss-reinforced concrete composite slab; characterized in that: The distance between the end of the embedded section and the edge of the truss reinforced concrete composite slab is 100-500mm; the truss reinforced concrete composite slab is provided with blind holes at the end of the embedded section and the edge of the truss reinforced concrete composite slab. The extended section is inserted into the blind hole and connected to the pre-embedded section by rotational welding. The extended section extends into the main body of the cast-in-place concrete beam.

2. The connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam according to claim 1, characterized in that: The distances between the ends of the embedded sections of two adjacent rows of reinforcing bars and the edge of the truss reinforced concrete composite slab are different, so that the connection positions of the embedded sections and overhangs of multiple rows of reinforcing bars are located on multiple different sections of the truss reinforced concrete composite slab.

3. The connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam according to claim 1 or 2, characterized in that: An embedded sleeve is provided inside the blind hole. The embedded sleeve includes a sleeve body. A concave, trumpet-shaped partition is provided in the middle of the sleeve body. A reinforcing bar through hole is provided in the middle of the partition. The diameter of the reinforcing bar through hole is slightly larger than the diameter of the stressed reinforcing bar. A grouting hole is provided on the partition body.

4. The connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam according to claim 3, characterized in that: The inner end of the sleeve body is provided with a concave flared end plate. A steel bar through hole is provided in the middle of the end. The diameter of the steel bar through hole is slightly larger than the diameter of the stressed steel bar and a sealing layer is provided at the edge. A grouting pipe is provided at the upper end of the sleeve body near the end plate. An exhaust pipe is provided at the upper end of the sleeve body between the end plate and the partition. The grouting pipe and the exhaust pipe extend to the top of the truss reinforced concrete composite slab.

5. The connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam according to claim 1, characterized in that: The embedded section has a frustum-shaped groove on the side closest to the cast-in-place concrete beam, and a first annular shoulder on the outside of the frustum-shaped groove. The extended section has a frustum-shaped protrusion on the side away from the cast-in-place concrete beam, and a second annular shoulder on the outside of the frustum-shaped protrusion.

6. The connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam according to claim 5, characterized in that: The size of the frustum-shaped protrusion is slightly larger than the size of the frustum-shaped groove, and the surfaces of the frustum-shaped protrusion and the frustum-shaped groove are rough surfaces.

7. A rotary welding apparatus for constructing a connection structure between a truss reinforced concrete composite slab and a cast-in-place concrete beam as described in any one of claims 1-6, characterized in that: The rotary welding equipment is used to rotary weld the extended section to the embedded section. The rotary welding equipment includes a machine body, and the machine body is equipped with an electric chuck and a drive device. The drive device is located at the top of the machine body, and the electric chuck is located at the bottom of the machine body. The drive device and the electric chuck are connected by a transmission mechanism so that the drive device drives the electric chuck to rotate at high speed. The bottom of the machine body can be inserted into the connection node between the truss reinforced concrete composite slab and the cast-in-place concrete beam to facilitate the clamping of the end of the extended section by the electric clamp.

8. The rotary welding equipment according to claim 7, characterized in that: The machine body includes a gearbox at the bottom, an electric chuck rotatably mounted on the right end of the gearbox, a riser at the upper end of the gearbox, a handle at the top of the riser, and a mounting plate on one side of the upper part of the riser. The bottom of the mounting plate is higher than the top surface of the cast-in-place concrete beam. The drive device is mounted on the mounting plate, and the transmission mechanism is located in the middle of the riser. The drive device is connected to the transmission mechanism, and the transmission mechanism is connected to the gearbox. The gearbox can drive the electric chuck to rotate.

9. The rotary welding equipment according to claim 8, characterized in that: The transmission mechanism includes a transmission shaft, a first bearing, a second bearing, and a first bevel gear. The transmission shaft is installed in the middle of the riser via the first and second bearings. The bottom end of the transmission shaft is connected to the gearbox. The first bevel gear is provided in the middle of the transmission shaft. The driving device includes a high-speed motor. The drive shaft of the high-speed motor passes through the riser, and a second bevel gear is provided at the end of the drive shaft. The first bevel gear meshes with the second bevel gear.

10. The rotary welding equipment according to any one of claims 8-9, characterized in that: The gearbox is provided with a jacking telescopic device and a height adjustment device at its left and bottom ends, respectively. The jacking telescopic device includes a first electric telescopic rod with a top plate at its telescopic end. The height adjustment device includes a second electric telescopic rod with a support plate at its telescopic end. The bottom of the support plate is provided with a rolling structure.

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