Large-diameter steel cage butt joint device connected by straight thread sleeve and construction method

Abstract

This invention discloses a large-diameter rebar cage butt connection device and construction method using straight threaded sleeves. The butt connection device includes an outer rebar positioning hoop, an inner rebar positioning hoop, and positioning clips. Two sets of both the outer and inner rebar positioning hoops are provided, arranged in parallel. An outer hoop positioning hole is formed on the inner side of the outer rebar positioning hoop, and an inner hoop positioning hole is formed on the outer side of the inner rebar positioning hoop. This invention uses multiple sets of positioning clips to position and combine the two sets of inner and outer rebar positioning hoops, ensuring their coaxial distribution and forming a stable butt connection device. This ensures that multiple straight threaded sleeves are located between the two sets of inner rebar positioning hoops and on the same horizontal plane, improving connection quality, ensuring the load-bearing capacity and stability of the rebar cage, meeting the construction industry's demand for high-quality connections of large-diameter rebar cages, and addressing the problem of poor coordination during straight threaded sleeve connection.

Description

Technical Field

[0001] This invention belongs to the field of rebar cage positioning and docking technology, specifically relating to a large-diameter rebar cage docking device and construction method using a straight threaded sleeve connection. Background Technology

[0002] In modern construction engineering, the structural stability of large-diameter steel reinforcement cages is crucial, and the quality of their connections directly affects structural safety. Traditional welding and tying connections have significant drawbacks: welding quality is greatly affected by the environment and welder's skills, construction is time-consuming, and it can easily damage the properties of the steel reinforcement; tying connections lack sufficient strength. Straight threaded sleeve connections offer advantages such as high strength, high reliability, ease of operation, and minimal susceptibility to environmental factors.

[0003] For example Figure 3 The large-diameter steel cage structure shown uses straight threaded sleeve connections. This structure faces the following problems in application: due to its large weight and diameter, it is difficult to position multiple steel bars, resulting in inconsistent connection quality of the straight threaded sleeves. Chinese invention patent application number 201811454131.1 discloses a rebar docking and positioning device and construction method for processing pile foundation rebar cages. The device includes: a steel pipe, a disc, through holes, upper section main rebar, lower section main rebar, and rebar fixing mechanisms. Holes are opened at the center of the two discs, and the steel pipe passes through the holes in the two discs and is fixedly connected to them. Multiple through holes are equally spaced on the circumference of the discs. Multiple upper and lower section main rebars are installed in the through holes on the circumference of the two discs at equal intervals. The upper and lower section main rebars are staggered and parallel to each other. Multiple rebar fixing mechanisms are provided, respectively located at the connection points between the discs and the upper and lower section main rebars, and the rebar fixing mechanisms fix and position the upper and lower section main rebars. However, the above solution requires the use of multiple rebar fixing mechanisms to install the corresponding rebars, making the entire operation process cumbersome and affecting on-site construction efficiency. Furthermore, the positioning effect of the straight thread sleeve structure is not good, which can easily lead to inaccurate docking of the upper and lower rebar cages and poor connection quality, failing to meet the high-quality connection requirements of large-diameter rebar cages.

[0004] Therefore, it is necessary to research and develop a large-diameter steel cage docking device and construction method using a straight threaded sleeve connection to solve the above problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a large-diameter steel cage docking device and construction method using a straight threaded sleeve connection. This solves the problems of inaccurate docking of upper and lower steel cage sections and poor connection quality, ensuring the load-bearing capacity and stability of the steel cage and meeting the construction industry's demand for high-quality connections of large-diameter steel cages.

[0006] The present invention provides the following technical solution: A large-diameter steel cage butt welding device using a straight threaded sleeve connection, including The number of outer hoops for rebar positioning is set to two sets, and the two sets of outer hoops for rebar positioning are distributed in parallel. The outer hoops for rebar positioning are provided with positioning holes on the inner side of the outer hoops. The number of inner hoops for rebar positioning is set to two sets, and the two sets of inner hoops for rebar positioning are distributed in parallel with the outer hoops for rebar positioning and are set between the two sets of outer hoops for rebar positioning. An inner hoop positioning hole is opened on the outer side of the inner hoop for rebar positioning. A positioning buckle is used to position and assemble two sets of outer and inner reinforcing bar positioning hoops. The positioning buckle is detachably installed between the inner and outer sides of the outer and inner reinforcing bar positioning hoops. The positioning buckle includes a positioning bolt, an outer positioning buckle, and an inner positioning buckle. The positioning bolt passes through the outer positioning buckle and is rotatably connected to the through hole. The positioning bolt is threadedly connected to the inner positioning buckle. Both ends of the outer positioning buckle are provided with outer positioning slots, and both ends of the inner positioning buckle are provided with inner positioning slots. The two outer positioning slots are respectively matched with the outer sides of the two sets of outer reinforcing bar positioning hoops, and the two inner positioning slots are respectively matched with the inner sides of the two sets of inner reinforcing bar positioning hoops. Supporting reinforcing bars and butt reinforcing bars are alternately distributed and embedded between the outer hoops and the inner hoops of the two sets of reinforcing bar positioning hoops. The butt reinforcing bars include a straight threaded sleeve, an upper layer of reinforcing bars and a lower layer of reinforcing bars. The straight threaded sleeve is located between the inner hoops of the two sets of reinforcing bar positioning hoops, and the upper layer of reinforcing bars and the lower layer of reinforcing bars are respectively threaded to both ends of the straight threaded sleeve.

[0007] Preferably, the number of outer hoop positioning holes and inner hoop positioning holes is set to multiple, and the multiple outer hoop positioning holes and multiple inner hoop positioning holes are arranged in a circular array, and the multiple outer hoop positioning holes are distributed in a one-to-one correspondence with the multiple inner hoop positioning holes.

[0008] Preferably, the outer hoop of the rebar positioning hoop has the same inner diameter as the inner hoop of the rebar positioning hoop, and the outer diameter of the outer hoop is larger than the inner diameter of the inner hoop, so that the multiple longitudinally distributed outer hoop positioning holes and inner hoop positioning holes are coaxially distributed.

[0009] Preferably, the number of supporting steel bars and butt steel bars is equal to half the number of positioning holes on the outer hoop of a steel bar positioning hoop, and the two ends of the ring structure formed by the multiple supporting steel bars and butt steel bars are tied with stirrups.

[0010] Preferably, the outer diameters of the supporting steel bars, upper steel bars, and lower steel bars are equal, and are equal to the inner diameters of the outer hoop positioning holes or inner hoop positioning holes.

[0011] Preferably, the upper and lower reinforcing bars are respectively provided with positive and negative external threads at their ends, and the inner ends of the straight thread sleeve are respectively provided with positive and negative internal threads that match the positive and negative external threads at the ends of the upper and lower reinforcing bars. The length of the positive and negative external threads of the upper and lower reinforcing bars is set to half the total length of the straight thread sleeve.

[0012] Preferably, the cross-sectional shape of the outer hoop positioning hole is U-shaped, the cross-sectional shape of the inner hoop positioning hole is semi-elliptical, and the corresponding outer hoop positioning hole and inner hoop positioning hole form a limiting ring in the longitudinal direction.

[0013] Preferably, the outer hoop of the rebar positioning hoop includes two first semi-circular ring plates and two connecting plates. The ends of the two first semi-circular ring plates are joined together and symmetrically distributed, and the two first semi-circular ring plates are connected by the connecting plates. The inner hoop of the rebar positioning hoop includes two second semicircular ring plates and two connecting plates. The ends of the two second semicircular ring plates are joined together and symmetrically distributed, and the two second semicircular ring plates are connected by the connecting plates.

[0014] Preferably, the number of positioning buckles is at least two, and the multiple positioning buckles are distributed in a circular array on the outside of the outer hoop and the inner hoop of the rebar positioning hoop. The outer positioning buckles are distributed parallel to the inner positioning buckles and are set perpendicular to the outer hoop and the inner hoop of the rebar positioning hoop.

[0015] This invention also discloses a construction method for butt welding of large-diameter steel cages using a straight threaded sleeve connection, which includes the following steps: S1. Connect the two first semi-circular ring plates with two connecting plates to form a set of ring-shaped lower layer steel bar positioning hoop outer hoop. Install the supporting steel bars and the threaded lower layer steel bars in sequence in an alternating pattern. Connect the straight threaded sleeve to the top of the lower layer steel bars and check. S2. Install a set of inner hoops for positioning steel bars at the bottom end of the straight threaded sleeve. Fit the two second semi-circular ring plates against the bottom surface of the straight threaded sleeve and make the inner hoop positioning holes fit into the supporting steel bars and the lower layer steel bars one by one. Then connect the two second semi-circular ring plates through two connecting plates to form a set of circular inner hoops for positioning steel bars. S3. Screw the upper layer of reinforcing bars into the inner top of the straight threaded sleeve. Then, install a set of inner reinforcing bar positioning hoops and a set of outer reinforcing bar positioning hoops in sequence above the straight threaded sleeve. The two sets of inner and outer reinforcing bar positioning hoops are symmetrically distributed about the central cross-section of the straight threaded sleeve. Multiple outer hoop positioning holes and inner hoop positioning holes form a limiting ring in the longitudinal direction. The supporting reinforcing bars, upper reinforcing bars and lower reinforcing bars are all embedded in the corresponding limiting rings. S4. Combine the two sets of inner and outer reinforcing bar positioning hoops using multiple sets of positioning buckles. Initially fix the upper and lower layers of outer reinforcing bar positioning hoops using the outer positioning buckles and their two ends of the outer positioning slots. Similarly, initially fix the upper and lower layers of inner reinforcing bar positioning hoops using the inner positioning buckles and their two ends of the inner positioning slots. Tighten the positioning bolts that are movably set on the outer and inner positioning buckles to bring the outer and inner positioning buckles closer to each other, effectively binding the two sets of inner and outer reinforcing bar positioning hoops. S5. Multiple sets of positioning buckles are evenly distributed. After installing all the positioning buckles, the connection between the upper and lower reinforcing bars and the straight threaded sleeve is checked again to ensure that the upper and lower reinforcing bars abut against each other at the ends after entering the straight threaded sleeve, forming butt reinforcing bars. S6. Stirrups are installed at both ends of multiple supporting steel bars and butt steel bars to form a tied steel cage. After inspection and approval, the outer hoop, inner hoop, and positioning clips of the steel bar positioning hoop are removed. Finally, the formed steel cage is hoisted to the construction site and the installation is completed.

[0016] Compared with the prior art, the present invention has the following advantages: By using multiple sets of positioning buckles to position and combine the inner and outer hoops of the two sets of rebar positioning hoops, they are coaxially distributed and form a stable docking device. This ensures that multiple straight threaded sleeves are located between the inner hoops of the two sets of rebar positioning hoops and are on the same horizontal plane, thereby improving the connection quality, ensuring the load-bearing capacity and stability of the rebar cage, and meeting the construction industry's demand for high-quality connections of large-diameter rebar cages. The evenly distributed limiting rings facilitate the connection and installation of large-diameter rebar cages and improve the problem of poor coordination of straight threaded sleeves during connection.

[0017] By setting the outer and inner hoops of the rebar positioning hoops as a semi-circular ring plate combination structure, and detachably installing the positioning buckles between the inner and outer sides of the outer and inner hoops, the outer positioning buckles and their two ends are used to initially fix the upper and lower layers of the outer rebar positioning hoops. Similarly, the inner positioning buckles and their two ends are used to initially fix the upper and lower layers of the inner rebar positioning hoops. By tightening the positioning bolts that are movably set on the outer and inner positioning buckles, the outer and inner positioning buckles are brought closer to each other, effectively binding the two sets of inner and outer rebar positioning hoops. After the rebar cage is formed, it is easy to disassemble quickly, which greatly improves the on-site construction efficiency. The device can be recycled, reducing construction costs. Attached Figure Description

[0018] Figure 1 A schematic diagram of the combined structure of the docking device provided by the present invention and a large-diameter steel cage connected by a straight threaded sleeve.

[0019] Figure 2A perspective view of the docking device provided by the present invention.

[0020] Figure 3 This is a schematic diagram of a large-diameter steel cage structure using a straight threaded sleeve connection, as provided in an embodiment of the present invention.

[0021] Figure 4 This is a perspective view of the outer hoop of the reinforcing bar positioning hoop in this invention.

[0022] Figure 5 This is a perspective view of the inner hoop of the rebar positioning hoop in this invention.

[0023] Figure 6 This is a schematic diagram of the distribution structure of the inner hoop and the straight threaded sleeve of the rebar positioning hoop in this invention.

[0024] Figure 7 This is a partial cross-sectional view of the butt-jointed reinforcing bars in this invention.

[0025] Figure 8 This is a schematic diagram of one embodiment of the positioning buckle in the present invention.

[0026] Marked in the image: 1. Outer hoop of rebar positioning; 2. Inner hoop of rebar positioning; 3. Positioning clip; 4. Supporting rebar; 5. Straight threaded sleeve; 6. Connecting plate; 7. Upper layer rebar; 8. Lower layer rebar; 9. Stirrup; 1-1. Outer hoop positioning hole; 1-2. First semi-circular ring plate; 2-1. Inner hoop positioning hole; 2-2. Second semi-circular ring plate; 3-1. Positioning bolt; 3-2. External positioning buckle; 3-3. Internal positioning buckle; 3-4. External positioning slot; 3-5. Internal positioning slot. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] like Figure 1-8 The large-diameter steel cage docking device with straight threaded sleeve connection shown includes a steel bar positioning hoop outer hoop 1, a steel bar positioning hoop inner hoop 2 and a positioning buckle 3. The number of steel bar positioning hoop outer hoop 1 is set to two sets, and the two sets of steel bar positioning hoop outer hoop 1 are distributed in parallel. An outer hoop positioning hole 1-1 is opened on the inner side of the steel bar positioning hoop outer hoop 1. The number of inner hoop 2 of the rebar positioning hoop is set to two sets, and the two sets of inner hoop 2 of the rebar positioning hoop are distributed in parallel with the outer hoop 1 of the rebar positioning hoop and are set between the two sets of outer hoop 1 of the rebar positioning hoop. The inner hoop positioning hole 2-1 is opened on the outer side of the inner hoop 2 of the rebar positioning hoop. The positioning buckle 3 is used to position and combine two sets of outer reinforcing bar positioning hoops 1 and two sets of inner reinforcing bar positioning hoops 2, and the positioning buckle 3 can be detachably installed between the inner and outer sides of the outer reinforcing bar positioning hoops 1 and the inner reinforcing bar positioning hoops 2. Specifically, the cross-sectional shape of the outer hoop positioning hole 1-1 is set to U-shape, and the cross-sectional shape of the inner hoop positioning hole 2-1 is set to semi-elliptical shape. The corresponding outer hoop positioning hole 1-1 and inner hoop positioning hole 2-1 form a limiting ring in the longitudinal direction. The semi-elliptical shape of the outer hoop positioning hole 1-1 can prevent certain minor errors in the installation and positioning of the reinforcing bars, so as to facilitate the adjustment of the position of the reinforcing bars.

[0029] In a preferred embodiment of the positioning buckle 3 in this application, there are four positioning buckles 3 arranged in a circular array. Each positioning buckle 3 includes a positioning bolt 3-1, an outer positioning buckle 3-2, and an inner positioning buckle 3-3. The positioning bolt 3-1 passes through the outer positioning buckle 3-2 and is rotatably connected to the through hole. The positioning bolt 3-1 is threadedly connected to the inner positioning buckle 3-3. Both ends of the outer positioning buckle 3-2 have outer positioning grooves 3-4, and both ends of the inner positioning buckle 3-3 have inner positioning grooves 3-5. The two outer positioning grooves 3-4 are respectively matched with the outer sides of the two sets of reinforcing bar positioning hoops 1, and the two inner positioning grooves 3-5 are respectively matched with the inner sides of the two sets of reinforcing bar positioning hoops 2. The distance between the positioning grooves 3-5 located at both ends of the same inner positioning buckle 3-3 is equal to the length of the straight threaded sleeve 5; thus ensuring that all straight threaded sleeves 5 are on the same horizontal plane during the tightening process of the upper reinforcing bar 7 and the lower reinforcing bar 8.

[0030] In addition, the number of positioning buckles 3 is set to at least two, and multiple positioning buckles 3 are arranged in a ring array on the outside of the outer hoop 1 and the inner hoop 2 of the rebar positioning hoop. The outer positioning buckle 3-2 and the inner positioning buckle 3-3 are distributed in parallel and are set perpendicular to the outer hoop 1 and the inner hoop 2 of the rebar positioning hoop.

[0031] The docking device is equipped with supporting steel bars 4 and docking steel bars. The supporting steel bars 4 and docking steel bars are alternately distributed and embedded between the outer hoop 1 and the inner hoop 2 of the two sets of steel bar positioning hoops. The docking steel bars include a straight thread sleeve 5, an upper layer steel bar 7 and a lower layer steel bar 8. The straight thread sleeve 5 is located between the inner hoop 2 of the two sets of steel bar positioning hoops, and the upper layer steel bar 7 and the lower layer steel bar 8 are respectively threaded to both ends of the straight thread sleeve 5.

[0032] Specifically, in the above technical solution, the number of outer hoop positioning holes 1-1 and inner hoop positioning holes 2-1 is set to multiple, and the multiple outer hoop positioning holes 1-1 and the multiple inner hoop positioning holes 2-1 are arranged in a ring array, and the multiple outer hoop positioning holes 1-1 correspond one-to-one with the multiple inner hoop positioning holes 2-1.

[0033] Specifically, in the above technical solution, the inner diameters of the outer hoop 1 and the inner hoop 2 of the reinforcing bar positioning hoop are equal, and the outer diameter of the outer hoop 1 is larger than the inner diameter of the inner hoop 2, so that the multiple outer hoop positioning holes 1-1 and inner hoop positioning holes 2-1 distributed longitudinally are coaxially distributed.

[0034] Specifically, in the above technical solution, the number of supporting steel bars 4 and butt steel bars is equal to half the number of outer hoop positioning holes 1-1 on the outer hoop 1 of a steel bar positioning hoop, and the two ends of the ring structure formed by the multiple supporting steel bars 4 and butt steel bars are tied with hoop bars 9.

[0035] Specifically, in the above technical solution, the outer diameters of the supporting steel bar 4, the upper layer steel bar 7, and the lower layer steel bar 8 are equal, and are equal to the inner diameters of the outer hoop positioning hole 1-1 or the inner hoop positioning hole 2-1.

[0036] Specifically, in the above technical solution, the ends of the upper layer reinforcing bar 7 and the lower layer reinforcing bar 8 are respectively provided with positive and negative external threads, which means that the external threads at the ends of the upper layer reinforcing bar 7 and the lower layer reinforcing bar 8 are reversed; the inner ends of the straight thread sleeve 5 are respectively provided with positive and negative internal threads that match the positive and negative external threads at the ends of the upper layer reinforcing bar 7 and the lower layer reinforcing bar 8, which means that the inner threads on the inner side of the straight thread sleeve 5 are reversed with the middle as the boundary; refer to Figure 7 As shown, the lengths of the positive and negative external threads of the upper reinforcing bar 7 and the lower reinforcing bar 8 are set to half the total length of the straight thread sleeve 5.

[0037] Specifically, in the above technical solution, the outer hoop 1 of the rebar positioning hoop includes two first semicircular ring plates 1-2 and two connecting plates 6. The ends of the two first semicircular ring plates 1-2 are joined and symmetrically distributed, and the two first semicircular ring plates 1-2 are connected by the connecting plates 6. The inner hoop 2 of the rebar positioning hoop includes two second semicircular ring plates 2-2 and two connecting plates 6. The ends of the two second semicircular ring plates 2-2 are joined and symmetrically distributed, and the two second semicircular ring plates 2-2 are connected by the connecting plates 6.

[0038] This invention also discloses a construction method for butt welding of large-diameter steel cages using a straight threaded sleeve connection, which includes the following steps: S1. Connect the two first semi-circular ring plates 1-2 through two connecting plates 6 to form a set of ring-shaped lower layer steel bar positioning hoop outer hoop 1. Install the supporting steel bar 4 and the threaded lower layer steel bar 8 in sequence in an alternating pattern. Connect the straight thread sleeve 5 to the top of the lower layer steel bar 8 and check it. S2. Install a set of inner hoop 2 for steel bar positioning at the bottom end of the straight thread sleeve 5, fit the two second semi-circular ring plates 2-2 against the bottom surface of the straight thread sleeve 5, and make the inner hoop positioning holes 2-1 correspondingly insert the supporting steel bar 4 and the lower layer steel bar 8. Then connect the two second semi-circular ring plates 2-2 through two connecting plates 6 to form a set of annular inner hoop 2 for steel bar positioning. S3. Screw the upper layer steel bar 7 into the top of the inner side of the straight thread sleeve 5. Then, install a set of inner steel bar positioning hoops 2 and a set of outer steel bar positioning hoops 1 in sequence above the straight thread sleeve 5, so that the two sets of inner steel bar positioning hoops 2 and the two sets of outer steel bar positioning hoops 1 are symmetrically distributed about the central cross-section of the straight thread sleeve 5. Multiple outer hoop positioning holes 1-1 and inner hoop positioning holes 2-1 form a limiting ring in the longitudinal direction, and the supporting steel bar 4, the upper layer steel bar 7 and the lower layer steel bar 8 are all embedded in the corresponding limiting ring. S4. Combine the two sets of inner hoops 2 and outer hoops 1 of the steel reinforcement positioning hoops using multiple sets of positioning buckles 3. Initially fix the upper and lower layers of outer hoops 1 of the steel reinforcement positioning hoops using the outer positioning buckles 3-2 and the outer positioning slots 3-4 at both ends. Similarly, initially fix the upper and lower layers of inner hoops 2 of the steel reinforcement positioning hoops using the inner positioning buckles 3-3 and the inner positioning slots 3-5 at both ends. Tighten the positioning bolts 3-1 that are movably set on the outer positioning buckles 3-2 and the inner positioning buckles 3-3 so that the outer positioning buckles 3-2 and the inner positioning buckles 3-3 are close to each other, effectively binding the two sets of inner hoops 2 and the two sets of outer hoops 1 of the steel reinforcement positioning hoops. S5. Multiple sets of positioning buckles 3 are evenly distributed. After installing all the positioning buckles 3, the connection between the upper layer steel bar 7 and the lower layer steel bar 8 and the straight thread sleeve 5 is checked again. This ensures that the upper layer steel bar 7 and the lower layer steel bar 8 abut against each other after entering the straight thread sleeve 5, so that the upper layer steel bar 7 and the lower layer steel bar 8 are tightly connected in the straight thread sleeve 5 to form butt steel bars. S6. Stirrups 9 are installed at both ends of multiple supporting reinforcing bars 4 and butt reinforcing bars to form a tied reinforcing cage. After inspection and approval, the outer hoop 1, the inner hoop 2, and the positioning clips 3 of the reinforcing bar positioning hoop are removed. Finally, the cage is assembled as follows. Figure 3 The pre-formed steel reinforcement cage shown was hoisted to the construction site and installed.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A butt joint device for large diameter reinforcement cages connected with straight thread sleeves, characterized in that, include The number of outer hoops (1) for rebar positioning is set to two sets, and the two sets of outer hoops (1) for rebar positioning are distributed in parallel. The outer hoop positioning holes (1-1) are opened on the inner side of the outer hoops (1). The inner hoop (2) of the steel bar positioning hoop is set to two sets, and the two sets of inner hoop (2) of the steel bar positioning hoop are distributed in parallel with the outer hoop (1) of the steel bar positioning hoop and are set between the two sets of outer hoop (1). The inner hoop positioning hole (2-1) is opened on the outer side of the inner hoop (2). The positioning buckle (3) is used to position and assemble two sets of outer hoops (1) and two sets of inner hoops (2) of the steel reinforcement positioning hoops. The positioning buckle (3) is detachably installed between the outer hoops (1) and the inner hoops (2) of the steel reinforcement positioning hoops. The positioning buckle (3) includes a positioning bolt (3-1), an outer positioning buckle (3-2) and an inner positioning buckle (3-3). The positioning bolt (3-1) passes through the outer positioning buckle (3-2) and is rotatably connected to the through hole. The positioning bolt (3-1) is threadedly sleeved with the inner positioning buckle (3-3). Both ends of the outer positioning buckle (3-2) are provided with outer positioning slots (3-4). Both ends of the inner positioning buckle (3-3) are provided with inner positioning slots (3-5). The two outer positioning slots (3-4) are respectively matched with the outer sides of the two sets of outer hoops (1) of the steel reinforcement positioning hoops. The two inner positioning slots (3-5) are respectively matched with the inner sides of the two sets of inner hoops (2) of the steel reinforcement positioning hoops. Supporting steel bars (4) and butt steel bars are alternately distributed and embedded between two sets of outer hoop (1) and inner hoop (2) of steel bar positioning hoops. The butt steel bars include a straight thread sleeve (5), an upper layer steel bar (7) and a lower layer steel bar (8). The straight thread sleeve (5) is located between the inner hoop (2) of the two sets of steel bar positioning hoops, and the upper layer steel bar (7) and the lower layer steel bar (8) are respectively threaded to both ends of the straight thread sleeve (5).

2. A butt joining device for large diameter reinforcement cages connected with straight thread sleeves according to claim 1, characterized in that, The number of outer hoop positioning holes (1-1) and inner hoop positioning holes (2-1) is set to multiple. The multiple outer hoop positioning holes (1-1) and multiple inner hoop positioning holes (2-1) are arranged in a ring array, and the multiple outer hoop positioning holes (1-1) correspond one-to-one with the multiple inner hoop positioning holes (2-1).

3. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 2, characterized in that, The outer hoop (1) of the steel bar positioning hoop has the same inner diameter as the inner hoop (2) of the steel bar positioning hoop, and the outer diameter of the outer hoop (1) of the steel bar positioning hoop is larger than the inner diameter of the inner hoop (2) of the steel bar positioning hoop, so that the multiple outer hoop positioning holes (1-1) and inner hoop positioning holes (2-1) distributed longitudinally are coaxially distributed.

4. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 3, characterized in that, The number of the supporting steel bars (4) and the butt steel bars is equal to half the number of the outer hoop positioning holes (1-1) on the outer hoop of a steel bar positioning hoop (1). The ring structure formed by the multiple supporting steel bars (4) and the butt steel bars is surrounded and distributed, and the two ends are tied with hoop bars (9).

5. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 4, characterized in that, The outer diameters of the supporting steel bars (4), the upper steel bars (7), and the lower steel bars (8) are equal, and are equal to the inner diameters of the outer hoop positioning holes (1-1) or the inner hoop positioning holes (2-1).

6. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 5, characterized in that, The upper reinforcing bar (7) and the lower reinforcing bar (8) are respectively provided with positive and negative external threads, and the inner ends of the straight thread sleeve (5) are respectively provided with positive and negative internal threads that match the positive and negative external threads at the ends of the upper reinforcing bar (7) and the lower reinforcing bar (8). The length of the positive and negative external threads of the upper reinforcing bar (7) and the lower reinforcing bar (8) is set to half the total length of the straight thread sleeve (5).

7. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 6, characterized in that, The outer hoop positioning hole (1-1) has a U-shaped cross-section, and the inner hoop positioning hole (2-1) has a semi-elliptical cross-section. The corresponding outer hoop positioning hole (1-1) and inner hoop positioning hole (2-1) form a limiting ring in the longitudinal direction.

8. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 7, characterized in that, The outer hoop (1) of the steel bar positioning hoop includes two first semi-circular ring plates (1-2) and two connecting plates (6). The ends of the two first semi-circular ring plates (1-2) are joined and symmetrically distributed, and the two first semi-circular ring plates (1-2) are connected by the connecting plates (6). The inner hoop (2) of the steel bar positioning hoop includes two second semi-circular ring plates (2-2) and two connecting plates (6). The ends of the two second semi-circular ring plates (2-2) are joined and symmetrically distributed, and the two second semi-circular ring plates (2-2) are connected by the connecting plates (6).

9. The large-diameter steel cage butt welding device using a straight threaded sleeve connection as described in claim 8, characterized in that, The number of positioning buckles (3) is at least two, and multiple positioning buckles (3) are arranged in a ring array on the outside of the outer hoop (1) and the inner hoop (2) of the steel reinforcement positioning hoop. The outer positioning buckle (3-2) and the inner positioning buckle (3-3) are distributed in parallel and are set perpendicular to the outer hoop (1) and the inner hoop (2) of the steel reinforcement positioning hoop.

10. A construction method for butt welding of large-diameter steel cages using a straight threaded sleeve connection, employing the butt welding device as described in claim 8, characterized in that, Includes the following steps: S1. Connect the two first semi-circular ring plates (1-2) through two connecting plates (6) to form a set of ring-shaped lower layer steel bar positioning hoop (1). Install the supporting steel bar (4) and the threaded lower layer steel bar (8) in sequence according to the form of one every other. Connect the straight thread sleeve (5) to the top of the lower layer steel bar (8) and check it. S2. Install a set of inner hoop (2) for steel bar positioning at the bottom end of the straight thread sleeve (5), fit the two second semi-circular ring plates (2-2) against the bottom surface of the straight thread sleeve (5), and make the inner hoop positioning holes (2-1) correspondingly insert the supporting steel bar (4) and the lower layer steel bar (8). Then connect the two second semi-circular ring plates (2-2) through two connecting plates (6) to form a set of circular inner hoop (2) for steel bar positioning. S3. Screw the upper layer steel bar (7) into the top of the inner side of the straight thread sleeve (5). Further install a set of inner steel bar positioning hoops (2) and a set of outer steel bar positioning hoops (1) on the upper side of the straight thread sleeve (5) so that the two sets of inner steel bar positioning hoops (2) and the two sets of outer steel bar positioning hoops (1) are symmetrically distributed about the central cross section of the straight thread sleeve (5). Multiple outer hoop positioning holes (1-1) and inner hoop positioning holes (2-1) form a limiting ring in the longitudinal direction, and the supporting steel bar (4), the upper layer steel bar (7) and the lower layer steel bar (8) are all embedded in the corresponding limiting ring. S4. Combine the two sets of inner hoops (2) and outer hoops (1) of the steel reinforcement positioning hoops using multiple sets of positioning buckles (3). Use the outer positioning buckle (3-2) and the outer positioning slots (3-4) at both ends to initially fix the upper and lower layers of outer hoops (1). Similarly, use the inner positioning buckle (3-3) and the inner positioning slots (3-5) at both ends to initially fix the upper and lower layers of inner hoops (2). Tighten the positioning bolts (3-1) that are movably set on the outer positioning buckle (3-2) and the inner positioning buckle (3-3) to bring the outer positioning buckle (3-2) and the inner positioning buckle (3-3) closer to each other, and effectively bind the two sets of inner hoops (2) and the two sets of outer hoops (1). S5. Multiple sets of positioning buckles (3) are evenly distributed. After installing all the positioning buckles (3), the connection between the upper layer steel bar (7) and the lower layer steel bar (8) and the straight thread sleeve (5) is checked again so that the upper layer steel bar (7) and the lower layer steel bar (8) abut against each other after entering the straight thread sleeve (5) to form butt steel bars. S6. Tie the stirrups (9) at both ends of multiple supporting steel bars (4) and butt steel bars to form a tied steel cage. After inspection and approval, remove the outer hoop (1), inner hoop (2) and positioning buckle (3) of the steel positioning hoop. Finally, hoist the formed steel cage to the construction site and complete the installation.

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