Steel column foot and steel bar precision butt joint device and method in steel bar dense area

Abstract

The application discloses a steel column foot and steel bar precise butt joint device in a steel bar dense area, relates to the technical field of steel column foot butt joint, and comprises a prefabricated assembly type anchor bolt positioning cage and a connecting sleeve for butt joint of steel bars, the prefabricated assembly type anchor bolt positioning cage comprises a bottom plate, which is used as the bottom of the column foot and the side of the column foot; a plurality of anchor bolts, which penetrate the bottom plate and are parallel to the central axis of the bottom plate; a positioning cage, which is connected to the anchor bolts and is used for positioning the anchor bolts; the connecting sleeve comprises a column foot sleeve, a connecting screw rod and a steel bar sleeve, the column foot sleeve is fixed to the bottom of the bottom plate and is vertical, one end of the connecting screw rod is threadedly connected to the column foot sleeve, the other end of the connecting screw rod is threadedly connected to the steel bar sleeve, and the other end of the steel bar sleeve is used for threadedly connecting the steel bars to be butt jointed. The application has the effects of improving the accuracy of butt joint of the steel column foot and the steel bars in the steel bar dense area and guaranteeing the structural quality.

Description

Technical Field

[0001] This application relates to the field of steel column base connection technology, and in particular to a device and method for precise connection between steel column base and steel bars in densely reinforced areas. Background Technology

[0002] Steel-concrete composite structure refers to a composite system formed by using steel sections as the core framework, with longitudinal steel bars and stirrups on the outside and then pouring concrete. It has high load-bearing capacity, high rigidity, and high seismic performance, and is increasingly used in public buildings such as high-rise office buildings, shopping malls, and schools.

[0003] In the expansion project of Z Banner D Middle School undertaken by our company, the library's open-air section uses a steel-concrete composite structure. During the early stages of the project, when reviewing the drawings and preparing the plans, it was discovered that the steel column bases were embedded steel column bases, and the reinforcing bars in the short columns of the foundation and the foundation beams were relatively dense and penetrated through the steel column bases. Since the steel column bases were not reinforced at the locations where the reinforcing bars penetrated, it was not permissible for the reinforcing bars to penetrate through the steel column bases.

[0004] Conventional steel column base anchor bolt installation requires the anchor bolts to be pre-embedded after the foundation reinforcement is tied. However, steel column base anchor bolts are easily affected by the dense reinforcement installed. On the one hand, installation is difficult, and on the other hand, the poor positioning accuracy leads to a large misalignment when the reinforcement is connected to the steel column base after the steel column base is installed.

[0005] If welding is used to connect the reinforcing bars to the steel columns, the dense reinforcing bars in the short columns of the foundation and the foundation beams will make the welding operation difficult, and the high temperature generated by a large amount of welding will affect the stress performance of the reinforcing bars and the steel columns. Summary of the Invention

[0006] To improve the accuracy of the connection between the steel column base and the reinforcing bars in areas with dense reinforcing bars and to ensure structural quality, this application provides a device and method for precise connection between the steel column base and the reinforcing bars in areas with dense reinforcing bars.

[0007] Firstly, this application provides a device for precise connection between the steel column base and the reinforcing bars in a densely reinforced area, employing the following technical solution: A device for precise connection between steel column base and reinforcing bars in a densely reinforced area includes a pre-assembled prefabricated anchor bolt positioning cage and a connecting sleeve for connecting the reinforcing bars. The prefabricated anchor bolt positioning cage includes: The base plate serves to be fixed to the bottom of the column base and extends to the side of the column base; Anchor bolts, which are multiple, each penetrating the base plate and parallel to the central axis of the base plate; A positioning cage, which is connected to the anchor bolt and used to position the anchor bolt; The connecting sleeve includes a column base sleeve, a connecting screw, and a reinforcing bar sleeve. The column base sleeve is fixed to the bottom of the base plate and is vertical. One end of the connecting screw is threaded to the column base sleeve, and the other end is threaded to the reinforcing bar sleeve. The other end of the reinforcing bar sleeve is used to thread-connect with the reinforcing bar to be connected.

[0008] Optionally, the positioning cage includes an upper clamping unit and a lower clamping unit located above and below the base plate, respectively. The upper clamping unit includes a plate and a stabilizing block. The plate is transverse and has a recessed side to form a slot that adapts to the side wall of the anchor bolt. The stabilizing block is detachably connected to the base plate and has a slot with a transverse opening. One end of the plate is inserted into the slot. The lower clamping unit is located at the bottom of the base plate and is used for secondary positioning of anchor bolts, indicating and positioning of reinforcing bars.

[0009] Optionally, the lower clamping unit includes a unit piece and a rod assembly. The unit piece is penetrated by an anchor bolt and has a slot with a transverse opening on its side. The two ends of the rod assembly are respectively connected to two adjacent unit pieces. The rod assembly includes an indicator plate and a movable plate. The end of the indicator plate is fixed to the unit piece. The indicator plate is marked with multiple rebar position marks, which are located to the side of the central axis of the column base sleeve. The position of the indicator plate is lower than the lower end of the connecting screw. The movable plate is slidably connected to the indicator plate and the sliding direction is laterally perpendicular to the indicator plate. The movable plate is provided with a second slot adapted to the side wall of the reinforcing bar.

[0010] Optionally, the connecting screw has an inner cavity, the lower end of which is open and the side wall has a filling port that communicates with the outside. The filling port is located above the rebar sleeve.

[0011] Optionally, the steel bar sleeve is a transparent structure or is equipped with a detection mechanism for detecting internal gaps.

[0012] Optionally, the detection mechanism includes a probe and a marking rod. The probe is vertically disposed in the inner cavity of the connecting screw and extends out at its lower end. One end of the marking rod is fixed to the upper end of the probe, and the other end extends laterally from the completion port. The completion port is an elongated port that extends vertically.

[0013] Optionally, the bottom of the probe rod is fixed with a centering plate, the cross-section of the centering plate is adapted to the lower end of the inner cavity of the connecting screw, the bottom of the centering plate is provided with a truncated cone, the truncated cone is a hollow structure with openings at the top and bottom, the centering plate is hollow and has an opening at the bottom, the probe rod and the marking rod are tubular structures and connected to the truncated cone, there are two marking rods, there are two completion ports and they are symmetrically arranged on the connecting screw, and the two marking rods extend from the two completion ports respectively.

[0014] Secondly, this application provides a method for precise connection between the steel column base and the reinforcing bars in a densely reinforced area, employing the following technical solution: It is applied to the connection work of steel column base and steel bar precision connection device in areas with dense steel bars as described in any of the above.

[0015] In summary, this application offers the following beneficial technical advantages: The prefabricated anchor bolt positioning cage can be pre-assembled in the factory or on-site and then placed as a whole into the densely reinforced area to be connected during construction. This eliminates the need to wait for the foundation reinforcement to be tied before pre-embedding the anchor bolts one by one, thus avoiding the impact of dense reinforcement on anchor bolt installation. This solves the problems of conventional anchor bolt installation, which requires waiting for the foundation reinforcement to be tied before pre-embedding and is easily affected by dense reinforcement, leading to installation difficulties and poor positioning accuracy. Furthermore, because the base plate, in conjunction with the connecting sleeve, achieves the connection between the reinforcement and the steel column base through the threaded connection of the column base sleeve, connecting bolt, and reinforcement sleeve, welding is not required. Therefore, the impact of high welding temperatures on the stress performance of the reinforcement and steel column is avoided, and the difficulty of welding operations in densely reinforced areas is also solved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the positioning cage in this application; Figure 3 This is a schematic diagram of the connecting sleeve in this application; Figure 4 This is an exploded view of the connecting sleeve in this application.

[0017] Explanation of reference numerals in the attached drawings: 1. Prefabricated anchor bolt positioning cage; 11. Base plate; 12. Anchor bolt; 13. Positioning cage; 131. Upper clamping unit; 1311. Plate; 1312. Stabilizing block; 132. Lower clamping unit; 1321. Unit piece; 1322. Rod assembly; 13221. Indicator plate; 13222. Movable plate; 2. Connecting sleeve; 21. Column base sleeve; 22. Connecting bolt; 221. Filler opening; 23. Rebar sleeve; 3. Detection mechanism; 31. Probe; 32. Marking rod; 33. Centering plate; 34. Frustum. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0019] This application discloses a device for precise connection between the steel column base and the reinforcing bars in a densely reinforced area.

[0020] Reference Figure 1The device for precise connection between steel column base and steel bar in densely reinforced areas includes a prefabricated anchor bolt positioning cage 1 and a connecting sleeve 2 for connecting steel bars. The prefabricated anchor bolt positioning cage 1 is a structure used to position multiple anchor bolts that fix the steel column base vertically, at intervals, and horizontally. It is pre-assembled and then used with the connecting sleeve 2 to connect the steel bars and steel column base in a weld-free manner.

[0021] The prefabricated anchor positioning cage 1 includes a base plate 11, anchor bolts 12, and a positioning cage 13. The base plate 11 is fixed to the bottom of the column base, and the fixing method can be welding or bolting, with welding being preferred to reduce obstruction to other structural installations. The side of the base plate 11 extends beyond the side of the column base. Multiple anchor bolts 12 penetrate the base plate 11 and are parallel to its central axis. The multiple anchor bolts 12 can be evenly distributed around the steel column base or arranged in a symmetrical group. The positioning cage 13 is connected to the anchor bolts 12 and is used to position the anchor bolts 12.

[0022] The connecting sleeve 2 includes a column base sleeve 21, a connecting bolt 22, and a rebar sleeve 23. The column base sleeve 21 is fixed to the bottom of the base plate 11 and is vertically installed. The number of column base sleeves 21 should match the number of matching rebars at the docking position. Their number and position can be pre-verified and determined using BIM technology combined with drawings. In this embodiment, only a small number of column base sleeves 21 are shown for ease of display.

[0023] One end of the connecting screw 22 is threaded to the lower end of the column base sleeve 21, and the other end is threaded to the rebar sleeve 23. The other end of the rebar sleeve 23 is used to thread with the rebar to be connected.

[0024] With the above settings, the prefabricated anchor bolt positioning cage 1 can be pre-assembled in the factory or on the construction site and then placed as a whole into the area with dense steel bars to be connected during construction. There is no need to wait for the foundation steel bars to be tied before pre-embedding the anchor bolts 12 one by one. This avoids the influence of dense steel bars on the installation of anchor bolts 12 and solves the problem that conventional anchor bolt installation requires waiting for the foundation steel bars to be tied before pre-embedding, and is easily affected by dense steel bars, resulting in installation difficulties and poor positioning accuracy.

[0025] Meanwhile, because the base plate 11, together with the connecting sleeve 2, achieves the connection between the steel bar and the steel column foot through the threaded connection of the column foot sleeve 21, the connecting screw 22 and the steel bar sleeve 23, no welding is required. Therefore, the influence of high welding temperature on the stress performance of the steel bar and the steel column is avoided, and the problem of difficult welding operations in dense steel bar areas is also solved.

[0026] In one embodiment of this application, reference is made to Figure 1 and Figure 2 The positioning cage 13 includes an upper clamping unit 131 and a lower clamping unit 132 located above and below the base plate 11, respectively.

[0027] The upper clamping unit 131 includes a plate 1311 and a stabilizing block 1312. The plate 1311 is horizontally arranged on the side of the steel column base and is recessed inward toward the side of the steel column base to form a slot that adapts to the side wall of the anchor bolt 12. The stabilizing block 1312 is detachably connected to the base plate 11 and is located on the side of the steel column base. Example of connection method: multiple spot welding at the bottom edge. The stabilizing block 1312 has a slot with a horizontal opening. The end of the plate 1311 is formed with an end plate, and one end of the end plate is inserted into the slot.

[0028] Understandably, plate 1311 is snapped onto the side wall of anchor bolt 12 via a snap-fit ​​mechanism. The plate 1311 is then fixed in place by inserting its end into the slot of stabilizing block 1312. The stabilizing block 1312, connected to the base plate 11, provides support for plate 1311. Because of its detachable connection structure, any misalignment can be easily and quickly adjusted on-site at a lower cost. The snap-fit ​​design, where the snap-fit ​​mechanism adapts to the side wall of anchor bolt 12, allows for rapid installation of plate 1311 without disassembling anchor bolt 12. Plate 1311 interconnects multiple anchor bolts, fixing their positions and perpendicularity, ensuring optimal performance in later use.

[0029] The lower clamping unit 132 is located at the lower part of the base plate 11 and is used for secondary positioning of the anchor bolt 12 and for indicating and positioning the position of the reinforcing bar.

[0030] With the above configuration, the upper clamping unit 131 clamps and fixes the upper part of the anchor bolt 12 from above the base plate 11, and the lower clamping unit 132 performs secondary positioning of the anchor bolt 12 from below the base plate 11. The dual positioning and fixing effectively improves the positioning accuracy of the anchor bolt 12, ensuring that the anchor bolt 12 is in an accurate position during the subsequent installation of the steel column base. This solves the problem that the anchor bolt position offset in the conventional pre-embedded installation method causes a large misalignment between the steel reinforcement and the steel column base after installation.

[0031] In one embodiment of this application, reference is made to Figure 2 The lower clamping unit 132 includes a unit piece 1321 and a rod assembly 1322. The unit piece 1321 is penetrated by the anchor bolt 12 and has a slot with a transverse opening on its side. The two ends of the rod assembly 1322 are respectively connected to two adjacent unit pieces 1321.

[0032] The rod assembly 1322 includes an indicator plate 13221 and a movable plate 13222. The end of the indicator plate 13221 has a locking block, which is inserted into a second locking slot and welded to fix the unit piece 1321. Multiple rebar position marks are marked on the surface of the indicator plate 13221, located to the side of the central axis of the column base sleeve 21. The position of the indicator plate 13221 is lower than the lower end of the connecting screw 22. The movable plate 13222 is slidably connected to the indicator plate 13221, with its sliding direction being laterally perpendicular to the indicator plate 13221. The movable plate 13222 has a second locking slot adapted to the sidewall of the rebar. The movable plate 13222 is located below the indicator plate 13221.

[0033] Understandably, the rebar position markings on the indicator plate 13221 indicate the positions where the rebars should pass through. When the prefabricated anchor bolt positioning cage 1 is lowered during hoisting construction, the construction personnel can quickly determine whether the rebar placement is correct based on the rebar position markings that appear on the side of the rebars in advance, without having to measure repeatedly. The movable plate 13222 can slide in the lateral direction. After the rebar position is determined, sliding the movable plate 13222 will cause the two clamps to engage with the side wall of the rebar, thereby fixing the rebar in place and preventing the rebar from shaking or shifting in position during the stage when the rebar sleeve 23 rotates and moves downward to begin docking.

[0034] Understandably, the above setup is based on the premise that the upper part of the steel bars to be connected must first be tapped to form a threaded structure.

[0035] It should be noted that the position of the indicator plate 13221 is lower than the lower end of the connecting screw 22. The reason for this setting is that the indicator plate 13221 needs to indicate the position of the reinforcing bar, which is located in the area below the connecting screw 22. Setting the indicator plate 13221 below the lower end of the connecting screw 22 makes the position mark of the reinforcing bar closer to the actual layout height of the reinforcing bar, which is convenient for construction personnel to make intuitive comparison.

[0036] With the above settings, the lower clamping unit 132 not only performs secondary positioning of the anchor bolt 12, but also realizes the indication and positioning of the rebar position through the rebar position marking on the indicator plate 13221 and the second clamp on the movable plate 13222. Construction personnel do not need to repeatedly measure the rebar position, but can directly position it according to the marking and clamp, which greatly improves the construction efficiency and positioning accuracy in areas with dense rebar.

[0037] In another embodiment of this application, reference is made to Figure 3 and Figure 4 The connecting screw 22 has an inner cavity, the lower end of which is open and the side wall has a filling port 221 that communicates with the outside. The filling port 221 is elongated and its length extends along the axial direction of the connecting screw 22. The filling port 221 is located above the steel bar sleeve 23.

[0038] Furthermore, the steel bar sleeve 23 is a transparent structure or is equipped with a detection mechanism for detecting internal gaps.

[0039] It is understandable that during the threaded connection between the reinforcing bar and the reinforcing bar sleeve 23, the end of the reinforcing bar may not be fully screwed into the bottom of the reinforcing bar sleeve 23, resulting in a gap between the reinforcing bar and the reinforcing bar sleeve 23. When the reinforcing bar sleeve 23 adopts a transparent structure, the construction personnel can directly observe the internal connection. However, transparent structures are usually made of glass or acrylic sheets. If such materials are used to make the sleeve, they are obviously more prone to damage during workpiece movement and storage compared to metal, and the strength is weaker after the connection. Therefore, it is also possible to use a testing agency to inspect the inside of the opaque reinforcing bar sleeve 23.

[0040] In one embodiment of this application, reference is made to Figure 3 and Figure 4 The detection mechanism includes a probe 31 and a marking rod 32. The probe 31 is vertically arranged in the inner cavity 221 of the connecting screw 22 and its lower end extends out. The marking rod 32 is perpendicular to the probe 31, with one end of the marking rod 32 fixed to the upper end of the probe 31 and the other end extending laterally from the filling port 221.

[0041] Operating principle: The probe rod 31 can move up and down in the inner cavity. When the reinforcing bar is not fully screwed into the reinforcing bar sleeve 23, the end of the reinforcing bar presses against the lower end of the probe rod 31, pushing the probe rod 31 to move upward. The marking rod 32 moves upward and rises in the filling opening 221. Construction personnel can judge whether the reinforcing bar is installed in place by observing the height position of the marking rod 32 in the filling opening 221. Since the filling opening 221 is long and extends vertically, it provides sufficient space for the marking rod 32 to move up and down.

[0042] With the above setup, the testing agency provides an intuitive method for detecting the proper placement of rebar connections. Construction workers can determine the quality of the rebar connection without disassembling the connecting sleeve 2, thus avoiding structural safety hazards caused by incomplete rebar placement.

[0043] In another embodiment of this application, reference is made to Figure 3 and Figure 4 A centering plate 33 is fixed to the bottom of the probe 31. The cross-section of the centering plate 33 is adapted to the lower end of the inner cavity of the connecting screw 22, and a truncated cone 34 is provided at its bottom. Through this setting, the diameter of the centering plate 33 is closer to the diameter of the inner cavity of the connecting screw 22, thereby keeping the probe 31 as vertical as possible and preventing it from swaying left and right. The truncated cone 34 is a hollow structure with openings at the top and sides. The probe 31 and the marking rod 32 are tubular structures and are connected to the truncated cone 34. There are two marking rods 32 and two completion ports 221, which are symmetrically arranged on the connecting screw 22. The two marking rods 32 extend from the two completion ports 221 respectively.

[0044] Understandably, the cross-section of the middle plate 33 is adapted to the lower end of the inner cavity, so that the probe 31 remains vertical in the inner cavity and will not affect the detection accuracy due to skewing. The cone 34 is a hollow structure with openings at the top and bottom. The center plate 33 is hollow and has multiple holes along its circumference at the bottom for concrete mortar or grout to enter. When the end of the reinforcing bar is against the cone 34, if there is a gap inside the reinforcing bar sleeve 23, concrete mortar or grout can be injected into the probe rod 31 and marking rod 32 of the pipe structure through the opening of the cone 34. The mortar flows into the reinforcing bar sleeve 23 through the side opening of the cone 34 and fills the gap. When the mortar overflows from the connecting screw 22 again, it indicates that the mortar in the connecting screw 22 is full. Therefore, it is squeezed from the hole of the center plate 33 and gradually spreads upward along the probe rod 31 until it overflows. This setting allows for a more direct understanding of whether the mortar in the connecting screw 22 is full, ensuring the strength of the connecting screw 22 installation.

[0045] The reason for setting two symmetrical marker rods 32 and a filler hole 221 is that the two marker rods simultaneously indicate the height position of the probe rod 31 from both sides, allowing construction personnel to observe from either side, thus improving the convenience of observation. At the same time, the symmetrical arrangement ensures that the probe rod 31 is subjected to uniform force, avoiding the deviation caused by a single marker rod.

[0046] Through the above-mentioned setup, the steel column base and rebar precision connection device in the densely reinforced area of ​​this application realizes the pre-assembly positioning of anchor bolts, precise indication and positioning of rebar positions, real-time detection of rebar connection quality, and online filling of gaps, effectively solving the problems of difficult installation of anchor bolts, poor positioning accuracy, and the impact of welding on the stress performance of steel column bases in densely reinforced areas.

[0047] This application also discloses a method for precise connection between the steel column base and the reinforcing bars in a densely reinforced area.

[0048] The method for precise connection between steel column base and steel reinforcement in densely reinforced areas involves using the precise connection device for steel column base and steel reinforcement in densely reinforced areas as described in any of the above embodiments.

[0049] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for precise connection between steel column base and reinforcing bars in a densely reinforced area, characterized in that: The assembly includes a pre-assembled prefabricated anchor bolt positioning cage (1) and a connecting sleeve (2) for connecting reinforcing bars. The prefabricated anchor bolt positioning cage (1) includes: The base plate (11) is used to fix the bottom of the column base and extends to the side of the column base; Anchor bolts (12), which are multiple, each penetrating the base plate (11) and parallel to the central axis of the base plate (11); A positioning cage (13) is connected to the anchor bolt (12) and is used to position the anchor bolt (12); The connecting sleeve (2) includes a column base sleeve (21), a connecting screw (22), and a reinforcing bar sleeve (23). The column base sleeve (21) is fixed to the bottom of the base plate (11) and is vertical. One end of the connecting screw (22) is threaded to the column base sleeve (21), and the other end is threaded to the reinforcing bar sleeve (23). The other end of the reinforcing bar sleeve (23) is used to thread-connect with the reinforcing bar to be connected.

2. The device for precise connection between steel column base and reinforcing bars in a densely reinforced area according to claim 1, characterized in that: The positioning cage (13) includes an upper clamping unit (131) and a lower clamping unit (132) located above and below the base plate (11), respectively. The upper clamping unit (131) includes a plate (1311) and a stabilizing block (1312). The plate (1311) is transverse and has a recessed side to form a slot adapted to the side wall of the anchor bolt (12). The stabilizing block (1312) is detachably connected to the base plate (11) and has a slot with a transverse opening. One end of the plate (1311) is inserted into the slot. The lower clamping unit (132) is located at the bottom of the base plate (11) and is used for secondary positioning of the anchor bolt (12) and for indicating and positioning the position of the reinforcing bar.

3. The device for precise connection between steel column base and reinforcing bars in a densely reinforced area according to claim 2, characterized in that: The lower clamping unit (132) includes a unit piece (1321) and a rod group (1322). The unit piece (1321) is penetrated by the anchor bolt (12) and has a slot with a transverse opening on the side. The two ends of the rod group (1322) are respectively connected to two adjacent unit pieces (1321). The rod assembly (1322) includes an indicator plate (13221) and a movable plate (13222). The end of the indicator plate (13221) is fixed to the unit piece (1321). The indicator plate (13221) is marked with multiple reinforcing bar position marks. The reinforcing bar position marks are located to the side of the central axis of the column base sleeve (21). The position of the indicator plate (13221) is lower than the lower end of the connecting screw (22). The movable plate (13222) is slidably connected to the indicator plate (13221) and the sliding direction is laterally perpendicular to the indicator plate (13221). The movable plate (13222) is provided with a second slot adapted to the side wall of the reinforcing bar.

4. The device for precise connection between steel column base and reinforcing bars in a densely reinforced area according to claim 3, characterized in that: The connecting screw (22) has an inner cavity, the lower end of the inner cavity is open and the side wall has a filling port (221) that connects to the outside. The filling port (221) is located above the steel sleeve (23).

5. The device for precise connection between steel column base and reinforcing bars in a densely reinforced area according to claim 4, characterized in that: The steel bar sleeve (23) is a transparent structure or is equipped with a detection mechanism (3) for detecting internal gaps.

6. The device for precise connection between steel column base and reinforcing bars in a densely reinforced area according to claim 5, characterized in that: The detection mechanism (3) includes a probe (31) and a marker rod (32). The probe (31) is vertically arranged in the inner cavity of the connecting screw (22) and its lower end extends out. One end of the marker rod (32) is fixed to the upper end of the probe (31), and the other end extends laterally from the completion port (221). The completion port (221) is a long opening and extends vertically.

7. The device for precise connection between steel column base and reinforcing bars in a densely reinforced area according to claim 6, characterized in that: The bottom of the probe (31) is fixed with a centering plate (33). The cross-section of the centering plate (33) is adapted to the lower end of the inner cavity of the connecting screw (22). A cone (34) is provided at the bottom of the centering plate (33). The cone (34) is a hollow structure with openings at the top and bottom. The centering plate (33) is hollow with a hole at the bottom. The probe (31) and the marking rod (32) are tube structures and are connected to the cone (34). There are two marking rods (32). There are two completion ports (221) and they are symmetrically arranged on the connecting screw (22). The two marking rods (32) extend from the two completion ports (221) respectively.

8. A method for precise connection between steel column base and reinforcing bars in a densely reinforced area, characterized in that: It is applied to the connection work of steel column base and steel bar precision connection device in densely reinforced areas as described in any one of claims 1-7.

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