Umbrella rib installation positioning structure and precision control method

Abstract

The present application relates to the field of construction positioning technology, and in particular to an umbrella rib installation positioning structure and precision control method, comprising a bottom cover disc, a center positioning pin coaxially arranged on the bottom cover disc, a setting point for being marked and measured by a total station arranged at the end of the center positioning pin, and a concentric fixing assembly arranged on the bottom cover disc, the concentric fixing assembly being used to coaxially fix the axis of the bottom cover disc on the axis of the end of the connecting pipe seat or the end of the umbrella rib rod. The present application has the effect of quickly determining the center of the circle and accurately positioning and installing.

Description

Technical Field

[0001] The present application relates to the technical field of building construction positioning, and in particular to an umbrella rib installation positioning structure and a precision control method. Background Art

[0002] As the exterior forms of buildings such as commercial centers and shopping malls tend to be diversified, structures such as special-shaped skylights and domes are constantly being innovated, and the umbrella-rib column support structure is a common structure in the construction of special-shaped skylights or domes.

[0003] A total station is a high-tech measuring instrument that integrates optics, mechanics, and electronics. Its full name is a total station electronic tachometer. It integrates the functions of a level, theodolite, distance meter, and measurement software, and has the functions of measuring horizontal angles, vertical angles, distances (slant distances, horizontal distances), and height differences, and can automatically calculate the coordinates and elevations of the points to be determined. The total station can complete all the measurement work on the measuring station in one installation, and is widely used in precision engineering measurement or deformation monitoring fields such as large-scale buildings on the ground and underground tunnel construction.

[0004] Related art discloses an umbrella rib column support structure, referring to Figure 1 , including an umbrella rib column 01, an umbrella rib joint 02 and an umbrella rib rod 03. The cross-sections of the umbrella rib column 01 and the umbrella rib rod 03 are both circular. The umbrella rib column 01 is fixed on the ground. The umbrella rib joint 02 is welded to the top of the umbrella rib column 01. Four connecting pipe sockets 04 with circular cross-sections are welded to the umbrella rib joint 02. The umbrella rib rod 03 is coaxially welded to the connecting pipe socket 04.

[0005] Due to the special-shaped structure of the canopy or dome, the canopy or dome has the problems of large height above the air and large fluctuations, which causes the umbrella ribs to be tilted in three planes of space. In addition, since the center of the umbrella ribs cannot be determined when the umbrella ribs are tilted and laid out, the installation accuracy of the umbrella ribs is difficult to control, which increases the difficulty of installing the umbrella rib column supporting structure, and the installation accuracy of the steel beams on the umbrella ribs cannot be guaranteed, which results in shortcomings. Summary of the invention

[0006] In order to improve the problem that the center of an umbrella rib is difficult to determine and thus the installation accuracy of the umbrella rib is difficult to control, the present application provides an umbrella rib installation positioning structure and an accuracy control method.

[0007] In the first aspect, the umbrella rib installation and positioning structure provided by the present application adopts the following technical solution:

[0008] An umbrella rib installation and positioning structure comprises a bottom cover disc, on which a center positioning pin is coaxially arranged, and on the end of which a setting-out point for being marked and measured by a total station is arranged, and on which a concentric fixing assembly is arranged, and which is used to coaxially fix the axis of the bottom cover disc on the axis of the end of a connecting tube seat or the end of an umbrella rib rod.

[0009] By adopting the above technical scheme, the construction personnel fix the axis of the bottom cover disc coaxially on the axis of the connecting tube seat end or the umbrella rib rod end through the concentric fixing assembly, and then measure the coordinates of the end of the center positioning needle through the total station, so as to indirectly determine the position of the center of the connecting tube seat end and the direction of the axis, and then determine the center position and axis direction of the umbrella rib rod end by the same method, so as to realize the precise installation of the umbrella rib rod, and then realize the precise installation of the steel beam on the umbrella rib rod, which is conducive to reducing the installation difficulty of the construction personnel.

[0010] Optionally, a plurality of reinforcing plates are arranged on the bottom cover disc along the circumferential direction of the axis of the center positioning needle, and the plurality of reinforcing plates are evenly distributed around the center positioning needle.

[0011] By adopting the above technical solution, the reinforcing plate ensures that the axis of the center positioning needle is always coaxial with the axis of the bottom cover disc during the movement with the bottom cover disc, which is beneficial to improving the accuracy of the measurement results of the total station.

[0012] Optionally, the concentric fixing assembly includes a chassis plate coaxially arranged on the bottom cover disc, a plurality of slide grooves are provided on the chassis plate in a radial direction along the axis thereof, the plurality of slide grooves are evenly arranged circumferentially along the axis of the chassis plate, a slider is slidably provided in each slide groove along its length direction, the cross-sections of the slider and the slide groove are both T-shaped, an abutment block is provided on the slider, the abutment block is used to abut against the inner side wall of the connecting tube seat or the umbrella rib rod, and a driving member for driving the slider to slide is provided on the chassis plate.

[0013] By adopting the above technical solution, when the construction personnel place the bottom sealing disc on the end of the connecting tube seat or the end of the umbrella rib rod, the driving member drives multiple sliders to slide synchronously in the direction away from the axis of the chassis plate, and the slider drives the abutment block to press against the inner side wall of the connecting tube seat or the umbrella rib rod, so that the axis of the bottom sealing disc is coincident with the axis of the end of the connecting tube seat or the axis of the bottom sealing disc with the axis of the end of the umbrella rib rod, and at the same time, the bottom sealing disc is fixed to the connecting tube seat or the umbrella rib rod through the chassis plate.

[0014] Optionally, the driving member includes an airbag arranged between the chassis plate and the bottom cover disc, the chassis plate is provided with a bag groove for accommodating the airbag, the bag groove is connected with the slide groove, the bottom cover disc is provided with an injection valve connected to the airbag, the airbag is circumferentially connected with a plurality of folding bags, the folding bags correspond one-to-one to the slide groove, and the side of the folding bag facing away from the airbag is arranged on the slider.

[0015] By adopting the above technical solution, construction workers inject high-pressure gas into the airbag through the air injection valve. The high-pressure gas pushes the folding bag to expand. The folding bag expands in the slide groove and pushes the slider to slide. The slider drives the abutment block to move in a direction away from the axis of the chassis plate, so that multiple abutment blocks can slide synchronously.

[0016] Optionally, there is a distance between the slide groove and the axis of the chassis plate, and a plurality of sealing plates are arranged between the sliding block and the end of the slide groove close to the axis of the chassis plate, the folding bag is located between the sealing plate and the slide groove, and the plurality of sealing plates are arranged along the axis direction of the chassis plate, one side of the sealing plate is provided with an anti-slip groove, and the other side is provided with an anti-slip block, the anti-slip groove is not opened at an end close to the sliding block, and the anti-slip groove between two adjacent sealing plates is slidably matched with the anti-slip block, and the cross-sections of the anti-slip groove and the anti-slip block are both T-shaped, and the sealing plate closest to the folding bag is fixed to the end of the slide groove close to the axis of the chassis plate, and the sealing plate farthest from the folding bag is fixed to the sliding block, and a baffle groove for the sealing plate to slide is provided on the inner side wall of the slide groove.

[0017] By adopting the above technical solution, when the folding bag expands and drives the slider to slide, the slider drives multiple sealing plates to slide in the baffle groove. At the same time, under the limiting action of the anti-slip groove and the anti-slip block, the multiple sealing plates gradually slide and unfold, thereby limiting the folding bag in the slide groove, reducing the possibility of the folding bag expanding and overflowing out of the slide groove, and at the same time facilitating the consistency of the expansion pressure of multiple folding bags, thereby making the multiple sliders slide synchronously, and further making the axis of the bottom cover disc coaxial with the axis of the end of the connecting tube seat or the axis of the end of the umbrella rib rod.

[0018] Optionally, an anti-slip strip is provided on the abutment block.

[0019] By adopting the above technical solution, the possibility of accidental falling off of the bottom cover disc during hoisting is reduced by increasing the friction force with the inner wall of the connecting pipe seat or the umbrella rib rod.

[0020] Optionally, a plurality of stopper blocks are detachably provided on the chassis plate, and the stopper blocks are used to block one end of the slide groove facing away from the axis of the chassis plate. The stopper blocks correspond to the slide grooves one by one, and a compression spring is provided between the slider and the stopper block.

[0021] By adopting the above technical solution, when the construction workers release the high-pressure air through the air injection valve, the compression spring pushes the slider to slide in the slide groove along the direction close to the axis of the chassis plate, so that the slider drives the abutment block away from the connecting pipe seat or the inner wall of the umbrella rib rod, making it convenient for the construction workers to quickly disassemble the bottom cover disc.

[0022] In a second aspect, the present application provides a method for controlling the accuracy of an umbrella rib installation and positioning structure, which adopts the following technical solution:

[0023] A method for controlling the accuracy of an umbrella rib installation and positioning structure comprises the following steps:

[0024] S1. Hoist the umbrella rib column to the designed position on the ground, and control the verticality of the umbrella rib column through multiple total stations;

[0025] S2, fixing the bottom cover disc on the connecting pipe seat of the umbrella rib joint through the concentric fixing assembly, and then hoisting the umbrella rib joint to the top of the umbrella rib column;

[0026] S3, projecting the projection point of the center of the circle of the center positioning pin end on any three of the bottom cover disks on the rib joint onto the ground and marking it, and then marking the line connecting the center of the rib column and the projection point on the ground;

[0027] S4. Total stations are set up on the extension lines of the three connecting lines. Two of the total stations are used to lay out the rib joints and guide the connecting pipe seats into place. Another total station is used to check the previous two total stations, and then the rib joints are welded to the rib columns.

[0028] S5, removing the bottom cover disc on the umbrella rib joint, and fixing the bottom cover disc on the umbrella rib rod through a concentric fixing assembly;

[0029] S6. Hoist the rib poles to the connecting pipe sockets of the rib joints, set up a total station on the extension line of the connecting line to lay out and direct the rib poles, set up another total station on the vertical line of the connecting line to check the installation of the rib poles, then weld and fix them, repeat the operation to weld all the rib poles to the connecting pipe sockets of the rib joints.

[0030] By adopting the above technical scheme, the projection point of the center of the connecting pipe seat for installing the bottom cover disc and the direction of the axis are first determined by a total station, and then the bottom cover disc is installed on the umbrella rib rod, and the projection point of the center of the end of the umbrella rib rod and the direction of the installation axis are determined by the total station, so as to control the installation accuracy of the umbrella rib rod and reduce the installation difficulty of construction personnel.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The construction personnel fix the axis of the bottom cover disc coaxially on the axis of the connecting tube seat end or the umbrella rib rod end through the concentric fixing assembly, and then measure the coordinates of the end of the center positioning needle through the total station, so as to indirectly determine the position of the center of the connecting tube seat end and the direction of the axis, and then determine the center position and axis direction of the umbrella rib rod end by the same method, so as to achieve accurate installation of the umbrella rib rod, and then achieve accurate installation of the steel beam on the umbrella rib rod, which is conducive to reducing the installation difficulty of the construction personnel;

[0033] 2. After the construction personnel place the bottom sealing disc on the end of the connecting tube seat or the end of the umbrella rib rod, the driving member drives multiple sliders to slide synchronously in the direction away from the axis of the bottom plate, and the slider drives the abutment block to abut against the inner wall of the connecting tube seat or the umbrella rib rod, so that the axis of the bottom sealing disc coincides with the axis of the end of the connecting tube seat or the axis of the bottom sealing disc with the axis of the end of the umbrella rib rod, and at the same time, the bottom sealing disc is fixed to the connecting tube seat or the umbrella rib rod through the bottom plate;

[0034] 3. When the folding bag expands and drives the slider to slide, the slider drives multiple sealing plates to slide in the baffle groove. At the same time, under the limiting action of the anti-slip groove and the anti-slip block, the multiple sealing plates gradually slide and unfold, thereby limiting the folding bag in the slide groove, reducing the possibility of the folding bag expanding and overflowing out of the slide groove, and at the same time facilitating the consistency of the expansion pressure of multiple folding bags, thereby making the multiple sliders slide synchronously, and then making the axis of the bottom cover disc coaxial with the axis of the end of the connecting tube seat or the axis of the end of the umbrella rib rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of the background technology.

[0036] Figure 2 It is a structural schematic diagram of the installation and positioning of the umbrella rib joint in the embodiment of the present application.

[0037] Figure 3 It is a structural schematic diagram of the installation and positioning of the umbrella rib rods in the embodiment of the present application.

[0038] Figure 4 It is a structural schematic diagram of the positional relationship between the bottom cover disc, the layout points and the bottom plate in the embodiment of the present application.

[0039] Figure 5 It is a structural schematic diagram of the positional relationship among the chassis plate, the sealing plate and the abutment block in the embodiment of the present application.

[0040] Figure 6 It is a cross-sectional view showing the positional relationship among the folding bag, the air bag and the slider in the embodiment of the present application.

[0041] Explanation of the reference numerals in the accompanying drawings: 00, total station; 01, rib column; 02, rib joint; 03, rib rod; 04, connecting tube socket; 1, bottom cover disc; 2, center positioning needle; 3, layout point; 4, concentric fixing assembly; 41, chassis plate; 42, slide groove; 43, slider; 44, abutment block; 45, driving member; 451, air bag; 452, bag groove; 453, air injection valve; 454, folding bag; 5, reinforcement plate; 6, sealing baffle plate; 7, anti-slip groove; 8, anti-slip block; 9, baffle groove; 10, anti-slip strip; 11, baffle groove block; 12, compression spring; 13, projection point. DETAILED DESCRIPTION

[0042] The following is combined with Figure 2-Figure 6 This application is described in further detail.

[0043] Example 1

[0044] The embodiment of the present application discloses an umbrella rib installation and positioning structure.

[0045] Reference Figure 2 A rib installation and positioning structure includes a bottom cover disc 1, on which a center positioning pin 2 is coaxially welded, and on which a plurality of reinforcing plates 5 are circumferentially welded along the axis of the center positioning pin 2. The plurality of reinforcing plates 5 are circumferentially evenly distributed around the center positioning pin 2.

[0046] Reference Figure 2 , Figure 3 and Figure 4 The end of the center positioning needle 2 is arranged with a layout point 3 for being marked and measured by the total station 00, and a concentric fixing component 4 is arranged on the bottom cover disc 1. The concentric fixing component 4 is used to coaxially fix the axis of the bottom cover disc 1 on the axis of the end of the connecting tube seat 04 or the end of the umbrella rib rod 03.

[0047] Reference Figure 4 , Figure 5 and Figure 6 The concentric fixing assembly 4 includes a chassis plate 41 coaxially bolted to the bottom cover disc 1, and a plurality of slide grooves 42 are provided on the chassis plate 41 along the radial direction of its axis. The plurality of slide grooves 42 are evenly arranged circumferentially along the axis of the chassis plate 41, and there is a distance between the slide grooves 42 and the axis of the chassis plate 41. A slider 43 is slidably fitted in each slide groove 42 along its length direction.

[0048] Reference Figure 4 , Figure 5 and Figure 6 The cross-sections of the slider 43 and the slide groove 42 are both T-shaped, and a contact block 44 is welded on the slider 43, and an anti-slip strip 10 is welded on the contact block 44. The anti-slip strip 10 is used to press against the inner wall of the connecting tube seat 04 or the umbrella rib rod 03, and a driving member 45 for driving the slider 43 to slide is arranged on the chassis plate 41.

[0049] The construction personnel place the chassis plate 41 on the end of the connecting tube seat 04 or the umbrella rib rod 03, and then drive multiple sliders 43 to slide synchronously in the direction away from the axis of the chassis plate 41 through the driving member 45. The slider 43 with the abutment block 44 gradually approaches the inner wall of the connecting tube seat 04 or the umbrella rib rod 03 until the slider 43 stops moving. At this time, the chassis plate 41 is fixed on the end of the connecting tube seat 04 or the umbrella rib rod 03.

[0050] Since multiple sliders 43 move synchronously, the axis of the chassis plate 41 is coaxial with the axis of the connecting tube seat 04 or the end of the umbrella rib rod 03. Since the bottom disk 1, the center positioning pin 2 and the chassis plate 41 are all coaxially arranged, the construction personnel can measure the layout point 3 at the end of the center positioning pin 2 through the total station 00 to obtain the center of the connecting tube seat 04 or the end of the umbrella rib rod 03.

[0051] Reference Figure 4 , Figure 5 and Figure 6 The driving member 45 includes an airbag 451 arranged between the chassis plate 41 and the bottom cover disc 1. A bag groove 452 for accommodating the airbag 451 is opened on the chassis plate 41. The bag groove 452 is connected to multiple slide grooves 42. An air injection valve 453 connected to the airbag 451 is welded on the bottom cover disc 1.

[0052] Reference Figure 4 , Figure 5 and Figure 6 There are multiple folding bags 454 connected circumferentially on the airbag 451, the folding bags 454 correspond to the slide groove 42 one by one and are located in the slide groove 42, the side of the folding bag 454 facing away from the airbag 451 is bonded to the slider 43, and multiple blocking groove blocks 11 are bolted to the chassis plate 41, the blocking groove block 11 is used to block one end of the slide groove 42 facing away from the axis of the chassis plate 41, the blocking groove block 11 corresponds to the slide groove 42 one by one, and a compression spring 12 is supported between the slider 43 and the blocking groove block 11.

[0053] Reference Figure 4 , Figure 5 and Figure 6 A plurality of sealing plates 6 are arranged between the slider 43 and the end of the slide groove 42 on the side close to the axis of the chassis plate 41. The folding bag 454 is located between the sealing plate 6 and the slide groove 42. The plurality of sealing plates 6 are arranged along the axial direction of the chassis plate 41. An anti-slip groove 7 is opened on one side of the sealing plate 6, and an anti-slip block 8 is welded on the other side. The end of the anti-slip groove 7 close to the slider 43 is not opened, and the anti-slip groove 7 and the anti-slip block 8 between two adjacent sealing plates 6 are slidably matched.

[0054] Reference Figure 4 , Figure 5 and Figure 6The cross-sections of the anti-slip groove 7 and the anti-slip block 8 are both T-shaped, and the length direction of the anti-slip groove 7 is parallel to the length direction of the slide groove 42. A sealing plate 6 closest to the folding bag 454 is bolted to the chassis plate 41 at the end of the slide groove 42 close to the axis of the chassis plate 41, and a sealing plate 6 farthest from the folding bag 454 is bolted to the slider 43. A baffle groove 9 for sliding the sealing plate 6 is opened on the inner side wall of the slide groove 42 along the sliding direction of the slider 43.

[0055] The construction personnel inject high-pressure gas into the airbag 451 through the air injection valve 453. Under the restrictive effect of the chassis plate 41 and the bottom cover disc 1, the high-pressure gas pushes the folding bag 454 to expand. The folding bag 454 expands in the slide groove 42 and pushes the slider 43 to slide. The slider 43 drives the abutment block 44 to move in a direction away from the axis of the chassis plate 41, thereby realizing the synchronous sliding of multiple abutment blocks 44 to abut the inner wall of the connecting pipe seat 04 or the inner wall of the umbrella rib rod 03.

[0056] When the folding bag 454 expands and drives the slider 43 to slide, the slider 43 drives the multiple sealing plates 6 to slide in the baffle groove 9. At the same time, under the limiting action of the anti-slip groove 7 and the anti-slip block 8, the multiple sealing plates 6 gradually slide and unfold along the sliding direction of the slider 43, thereby limiting the folding bag 454 in the slide groove 42, so that the expansion pressure of the multiple folding bags 454 is consistent, thereby realizing the synchronous sliding of the multiple sliders 43, and then making the axis of the bottom cover disc 1 coaxial with the axis of the end of the connecting tube seat 04 or the axis of the end of the umbrella rib rod 03.

[0057] The implementation principle of Example 1 is as follows: the construction personnel place the chassis plate 41 on the end of the connecting tube seat 04 or the umbrella rib rod 03, and then drive multiple sliders 43 to slide synchronously in the direction away from the axis of the chassis plate 41 through the driving member 45, and the slider 43 with the abutment block 44 gradually approaches the inner wall of the connecting tube seat 04 or the umbrella rib rod 03 until the slider 43 stops moving. At this time, the chassis plate 41 is fixed on the end of the connecting tube seat 04 or the umbrella rib rod 03.

[0058] Since multiple sliders 43 move synchronously, the axis of the chassis plate 41 is coaxial with the axis of the connecting tube seat 04 or the end of the umbrella rib rod 03. Since the bottom disk 1, the center positioning pin 2 and the chassis plate 41 are all coaxially arranged, the construction personnel can measure the layout point 3 at the end of the center positioning pin 2 through the total station 00 to obtain the center of the connecting tube seat 04 or the end of the umbrella rib rod 03.

[0059] The construction personnel inject high-pressure gas into the airbag 451 through the air injection valve 453. Under the restrictive effect of the chassis plate 41 and the bottom cover disc 1, the high-pressure gas pushes the folding bag 454 to expand. The folding bag 454 expands in the slide groove 42 and pushes the slider 43 to slide. The slider 43 drives the abutment block 44 to move in a direction away from the axis of the chassis plate 41, thereby realizing the synchronous sliding of multiple abutment blocks 44 to abut the inner wall of the connecting pipe seat 04 or the inner wall of the umbrella rib rod 03.

[0060] When the folding bag 454 expands and drives the slider 43 to slide, the slider 43 drives the multiple sealing plates 6 to slide in the baffle groove 9. At the same time, under the limiting action of the anti-slip groove 7 and the anti-slip block 8, the multiple sealing plates 6 gradually slide and unfold along the sliding direction of the slider 43, thereby limiting the folding bag 454 in the slide groove 42, so that the expansion pressure of the multiple folding bags 454 is consistent, thereby realizing the synchronous sliding of the multiple sliders 43, and then making the axis of the bottom cover disc 1 coaxial with the axis of the end of the connecting tube seat 04 or the axis of the end of the umbrella rib rod 03.

[0061] Example 2

[0062] Embodiment 2 of the present application discloses a method for controlling the accuracy of an umbrella rib installation and positioning structure, comprising the following steps:

[0063] S1. The construction personnel review the drawings and determine the engineering quantity, steel quantity, rib size and rib position of the special-shaped canopy;

[0064] S2. Arrange the materials to enter the site according to the calculated engineering quantity and steel consumption, and keep the on-site acceptance records. Arrange the corresponding machinery to enter the site according to the requirements of the construction plan, and keep the maintenance records;

[0065] S3, check whether the rib installation and positioning structure is intact, and whether the center positioning pin 2 is perpendicular to the bottom cover disc 1;

[0066] S4, hoisting the umbrella rib column 01 to the ground or the designed position of the floor, and controlling the verticality of the umbrella rib column 01 by using multiple total stations 00, and then welding the bottom of the umbrella rib column 01 to the mounting seat on the ground or the floor;

[0067] S5, fix the bottom cover disc 1 on the connecting pipe seat 04 of the umbrella rib joint 02 through the concentric fixing assembly 4, and then hoist the umbrella rib joint 02 to the top of the umbrella rib column 01;

[0068] S6, project the projection point 13 of the center of the end of the center positioning pin 2 on any three bottom cover discs 1 on the rib joint 02 on the ground and mark it, and then mark the line between the center of the rib column 01 and the projection point 13 on the ground;

[0069] S7, a total station 00 is set up on the extension lines of the three connecting lines, two of the total stations 00 are used to lay out the rib joints 02 to guide the connecting pipe sockets 04 into place, and another total station 00 is used to check the previous two total stations 00, and then the rib joints 02 are welded to the rib columns 01;

[0070] S8. erect a scaffolding structure around the umbrella rib column 01;

[0071] S9, dismantle the bottom cover disc 1 on the umbrella rib joint 02, and fix the bottom cover disc 1 on the umbrella rib rod 03 through the concentric fixing assembly 4;

[0072] S10, hoist the umbrella rib rod 03 to the connecting pipe socket 04 of the umbrella rib joint 02, and set up a total station 00 on the extension line of the connecting line to conduct the layout and command of the umbrella rib rod 03. At the same time, set up another total station 00 on the vertical line of the connecting line to check the installation of the umbrella rib rod 03, and then weld and fix it. Repeat the operation to weld all the umbrella rib rods 03 to the connecting pipe socket 04 of the umbrella rib joint 02.

[0073] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An umbrella rib installation and positioning structure, characterized in that: The invention comprises a bottom cover disc (1), a center positioning needle (2) is coaxially arranged on the bottom cover disc (1), a setting-out point (3) for being marked and measured by a total station (00) is arranged at the end of the center positioning needle (2), a concentric fixing assembly (4) is arranged on the bottom cover disc (1), the concentric fixing assembly (4) is used to coaxially fix the axis of the bottom cover disc (1) on the axis of the end of the connecting pipe seat (04) or the end of the umbrella rib rod (03), the concentric fixing assembly (4) comprises a bottom plate (41) coaxially arranged on the bottom cover disc (1), a plurality of slide grooves (42) are opened on the bottom plate (41) along the radial direction of the axis thereof, and the plurality of slide grooves (42) are arranged along the axis of the bottom plate (41). The slide groove (42) is evenly arranged in the circumferential direction, and a slider (43) is slidably arranged in each of the slide grooves (42) along the length direction thereof. The cross sections of the slider (43) and the slide groove (42) are both T-shaped. The slider (43) is provided with an abutment block (44), and the abutment block (44) is used to abut against the inner side wall of the connecting pipe seat (04) or the umbrella rib rod (03). The chassis plate (41) is provided with a driving member (45) for driving the slider (43) to slide. The driving member (45) includes an air bag (451) arranged between the chassis plate (41) and the bottom cover disc (1). The chassis plate (41) is provided with a bag groove (452) for accommodating the air bag (451), and the bag groove (452) is connected to the bottom cover disc (1). The bottom cover disc (1) is connected to the slide groove (42), an air injection valve (453) connected to the airbag (451) is arranged on the bottom cover disc (1), a plurality of folding bags (454) are circumferentially connected to the airbag (451), the folding bags (454) correspond to the slide groove (42) one by one, the side of the folding bags (454) facing away from the airbag (451) is arranged on the slider (43), the slide groove (42) is spaced apart from the axis of the chassis plate (41), a plurality of sealing plates (6) are arranged between the slider (43) and the end of the slide groove (42) close to the axis of the chassis plate (41), the folding bags (454) are located between the sealing plates (6) and the slide groove (42), A plurality of the sealing plates (6) are arranged along the axial direction of the chassis plate (41); an anti-slip groove (7) is provided on one side of the sealing plate (6) and an anti-slip block (8) is provided on the other side; the anti-slip groove (7) is not opened at one end close to the sliding block (43); the anti-slip groove (7) and the anti-slip block (8) between two adjacent sealing plates (6) are slidably matched; the cross-sections of the anti-slip groove (7) and the anti-slip block (8) are both T-shaped; the sealing plate (6) closest to the folding bag (454) is fixed to the end of the slide groove (42) close to the axis of the chassis plate (41); the sealing plate (6) farthest from the folding bag (454) is fixed to the sliding block (43);The inner side wall of the slide groove (42) is provided with a baffle groove (9) for the sealing baffle (6) to slide.

2. The umbrella rib installation and positioning structure according to claim 1, characterized in that: A plurality of reinforcing plates (5) are arranged on the bottom cover disc (1) along the circumferential direction of the axis of the center positioning needle (2), and the plurality of reinforcing plates (5) are evenly distributed around the center positioning needle (2) in the circumferential direction.

3. The umbrella rib installation and positioning structure according to claim 1, characterized in that: The abutment block (44) is provided with an anti-slip strip (10).

4. The umbrella rib installation and positioning structure according to claim 1, characterized in that: A plurality of stopper blocks (11) are detachably provided on the chassis plate (41), and the stopper blocks (11) are used to block one end of the slide groove (42) that is away from the axis of the chassis plate (41). The stopper blocks (11) correspond to the slide grooves (42) one by one, and a compression spring (12) is provided between the slider (43) and the stopper block (11).

5. A method for controlling the accuracy of an umbrella rib installation and positioning structure according to any one of claims 1 to 4, characterized in that: The steps include: S1, hoisting the umbrella rib column (01) to the designed position on the ground, and controlling the verticality of the umbrella rib column (01) by using a plurality of total stations (00); S2, fixing the bottom cover disc (1) on the connecting pipe seat (04) of the umbrella rib joint (02) by means of the concentric fixing assembly (4), and then hoisting the umbrella rib joint (02) to the top of the umbrella rib column (01); S3, projecting the projection point (13) of the center of the end of the center positioning pin (2) on any three of the bottom cover discs (1) on the rib joint (02) on the ground and marking it, and then marking the line connecting the center of the rib column (01) and the projection point (13) on the ground; S4, total stations (00) are set up on the extension lines of the three connecting lines, two of the total stations (00) are used to lay out the rib joints (02) to guide the connecting pipe sockets (04) into position, another total station (00) is used to check the previous two total stations (00), and then the rib joints (02) are welded to the rib columns (01); S5, removing the bottom cover disc (1) from the umbrella rib joint (02), and fixing the bottom cover disc (1) to the umbrella rib rod (03) by means of a concentric fixing assembly (4); S6, hoist the umbrella rib rod (03) to the connecting pipe socket (04) of the umbrella rib joint (02), set up a total station (00) on the extension line of the connecting line, and conduct layout and command of the umbrella rib rod (03), set up another total station (00) on the vertical line of the connecting line to check the installation of the umbrella rib rod (03), and then weld and fix it, and repeat the operation to weld all the umbrella rib rods (03) to the connecting pipe socket (04) of the umbrella rib joint (02).

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