A pre-positioning and target installation platform for the lower chord ball of a grid structure and its installation method

Abstract

The present invention discloses a pre-positioning and targeted installation platform for the lower chord balls of a grid structure and an installation method thereof, which includes a number of arrayed staging platforms, positioning tracks, adjustable support components, load-bearing beams, brackets, limit trays, card slots, raised points, etc. A chute is provided on the positioning track, and the chute is used for slidably connecting a positioning target. The positioning target is used for connecting the grid structure ball and driving the grid structure ball to move along the positioning track to a fixed-point position. The positioning target is docked with the card slot below through the through hole, so that the grid structure ball falls on the raised point. This installation platform and installation method can provide a precise positioning and installation platform for the pre-positioning of grid structure balls, and orderly complete the positioning and installation of grid structure balls by using the targeted movement and positioning method of the positioning track group and the positioning target, avoiding the observation obstruction and operation errors that may be encountered when directly positioning the grid structure balls, and having relatively high construction quality and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of construction auxiliary equipment, and particularly to a pre-positioning target installation platform for the lower chord balls of a grid and an installation method thereof. Background Art

[0002] Steel structure grids are widely used in the field of large-span and large-space buildings. The positioning of grid balls is the source of ensuring the construction quality of grids. In the traditional process, after positioning one grid ball, the method of advancing from the center to the surrounding or from the far end to the near end is adopted to avoid the problem that the cutting sizes of chord members and web members do not adapt to the on-site conditions. However, this method cannot ensure the horizontal and vertical arrangement of the grid ball array and is also prone to cumulative errors, resulting in an obvious gap between the final forming effect and the design drawing. In addition, the method of using a total station to lay out the positions of grid balls point by point is subject to accidental errors in manual operation. It needs to be positioned once before the installation of grid balls and retested and fine-tuned temporarily before fixing. The work efficiency is low, the error is large, and the quality guarantee is insufficient. Summary of the Invention

[0003] The object of the present invention is to solve the problems existing in the prior art, and provide a pre-positioning target installation platform for the lower chord balls of a grid and an installation method thereof, aiming to reduce the positioning error, improve the construction quality, and accelerate the construction progress.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A pre-positioning target installation platform for the lower chord balls of a grid, comprising a plurality of falsework platforms arranged in an array. A connected positioning track is arranged on the plurality of falsework platforms according to the row and column arrangement. Sleepers are respectively provided on each falsework platform, and adjustable support components are provided on the sleepers to support the positioning track. A load guiding beam is further provided on the falsework platform, and a limit tray is supported and connected to the load guiding beam through a bracket. A card slot is provided on the bottom of the limit tray, and a plurality of raised points are provided on the inner side of the tray wall of the limit tray. The raised points are used for clamping the grid balls. The positioning track on each falsework platform respectively passes through the limit tray on the corresponding falsework platform, and the arrangement height of the positioning track is lower than that of the raised points and keeps a distance from the bottom of the tray. A chute is provided on the positioning track, and the chute is used for slidably connecting a positioning target. The positioning target is used for connecting the grid ball and driving the grid ball to move along the positioning track. Through holes are respectively provided on the positioning track corresponding to each card slot. When the positioning target drives the grid ball to move to a fixed-point position, the positioning target is docked with the card slot below through the through hole, so that the grid ball falls on the raised points.

[0006] Through the settings of the lower chord ball pre-positioning and targeting installation platform of this grid framework, such as the falsework platform and the positioning track, etc., it can provide a precise positioning and installation platform for the pre-positioning of grid balls. By using the targeting movement and positioning method of the positioning track group and the positioning target, the positioning and installation of grid balls can be completed in an orderly manner, avoiding the observation obstruction and operation errors that may be encountered when directly positioning grid balls, and fully ensuring the construction quality.

[0007] Through the arrayed falsework platforms, it is very convenient to lay the positioning tracks that penetrate each falsework platform. By using the sliding grooves in the positioning tracks to move the positioning targets with grid balls, the purpose of quickly positioning and installing grid balls can be achieved. The sleeper and the adjustable support assembly set on the falsework platform can well support each section of the positioning track, and the adjustable support assembly can also adjust the elevation of the positioning track so that all positioning tracks are at the same elevation, which is beneficial to the subsequent rapid positioning and installation of grid balls.

[0008] The settings of the load-bearing beam and the bracket can support and connect the limit tray. The limit tray itself does not contact the positioning track, but allows the positioning track to pass through these limit trays. When the grid ball at this place moves in place, the limit tray can be connected to the positioning target by using the card slots on the limit tray, and the grid ball can be snap-fitted and installed on the raised points of the limit tray.

[0009] Furthermore, the sleeper and the load-bearing beam on the same falsework platform are arranged in parallel, and a pair of sleepers are symmetrically arranged on both sides; the height of the positioning track supported by the adjustable support assembly is higher than the height of the limit tray supported by the bracket.

[0010] Furthermore, two adjustable support assemblies are symmetrically arranged on the same sleeper. The adjustable support assembly includes a sleeve fixed on the sleeper. A support screw is sleeved in the sleeve. A circular support is provided at the end of the support screw. The support is connected to the positioning track, and an adjusting nut is also sleeved on the support screw.

[0011] By using the adjusting nut, the height of the support screw in the sleeve can be adjusted, so as to adjust the support height of the positioning track. The setting of the circular support is convenient for snap-fitting connection with the convex plate below the positioning track, and has the functions of limiting and positioning.

[0012] Furthermore, the bracket is arranged in the middle of the load-bearing beam, that is, at the center position of the falsework platform. The bracket includes a flange seat fixed on the load-bearing beam. A high-strength and lightweight spring is arranged in the sleeve structure on the flange seat, and the limit tray is installed on the high-strength and lightweight spring.

[0013] The high-strength and lightweight spring can be compressed within the sleeve structure under the action of an external force. After the positioning target and the grid ball are moved into place, when pressing down to make the positioning target engage with the card slot, the high-strength and lightweight spring can also be compressed into the flange seat.

[0014] Further, the limiting tray includes the integrally formed tray bottom and a pair of tray walls. Above the inner side of each tray wall, two convex points are symmetrically arranged respectively. An arc surface or an inclined surface for supporting the grid ball is provided on the convex point. The distance between a pair of convex points on both sides is not less than the width of the positioning track, which is convenient for the installation of the positioning track and also facilitates the support of the falling grid ball.

[0015] Further, the sliding groove is an inverted T-shaped sliding groove arranged within the positioning track. A plurality of springs are respectively provided on both sides inside the sliding groove. A partition is provided at the end of the spring, and a sliding bead is provided outside the partition. Limiting baffles are also respectively provided on the upper and lower sides inside the sliding groove. The limiting baffles are used for limiting the sliding bead, and a part of the outer circumference of the sliding bead protrudes from the spacing of the limiting baffles to act on the positioning target.

[0016] Utilizing the sliding groove and the sliding beads arranged within the sliding groove is conducive to the rapid and smooth movement of the positioning target along the sliding groove. A spring is arranged between the sliding beads and the sliding groove to make it have a certain elastic force, which is conducive to the surface of the sliding bead abutting against the positioning target but does not limit the positioning target. The partition and the limiting baffles can form a limiting space to accommodate the sliding beads.

[0017] Further, the distance between a pair of limiting baffles on both sides is greater than the diameter of the through hole, and the diameter of the through hole is greater than the width of the opening above the sliding groove. Such a setting does not affect the downward movement of the positioning target at the designated position; convex plates are also provided on both sides below the positioning track, and a pair of convex plates are used for clamping the adjustable support assembly.

[0018] Further, the positioning target is an inverted T-shaped round screw rod. The diameter of the screw cap of the positioning target is adapted to the inner diameters of the through hole and the card slot, and the diameters are basically the same, just allowing the screw cap to pass through. The grid balls are respectively welded and fixed to the ends of the positioning target.

[0019] Further, the jig platforms are arranged in an array in rows and columns. One row of positioning tracks is arranged on each column of jig platforms, and one row of positioning tracks is arranged on at least one row of jig platforms. One row of positioning tracks communicates with multiple columns of positioning tracks to form a track group.

[0020] A pre-positioning and target installation method for the lower chord balls of a grid includes the following steps:

[0021] (1)Prefabricate the positioning track, and prepare the jig platform, the adjustable support assembly, the sleeper, the load guiding beam, the bracket and the limit tray;

[0022] (2)Weld and fix the sleeper and the load guiding beam on the jig platform respectively, then fixedly install the adjustable support assembly on the sleeper, install the bracket on the load guiding beam, and install the limit tray on the bracket;

[0023] (3)Set out the lines for positioning. First, determine the predetermined coordinates of the four grid balls at the four corners in the rectangular array, and install the jig platforms at these four positions; then divide the lines to obtain the predetermined coordinates of the other grid balls in the rectangular array, and install the remaining jig platforms. The center points of all the jig platforms are respectively located at the center points of the corresponding predetermined coordinates;

[0024] (4)Set up the positioning track, measure and transfer the elevation of the upper line of the positioning track on each jig platform, and level all the positioning tracks to the same elevation through the adjustable support assembly, and weld the positioning tracks to form an integral whole;

[0025] (5)After the grid balls enter the site, weld the positioning targets at the bottoms of the grid balls, and install the grid balls in sequence from the open end of the proximal positioning track from the distal end to the proximal end, that is, send the grid balls with the positioning targets into the chute from the open end of the positioning track. After sliding to the installation position of the predetermined coordinates, the positioning targets pass through the through holes on the positioning track and engage with the card slots on the bracket to complete the positioning and installation of a single grid ball, and then complete the installation of the remaining grid balls in sequence.

[0026] Through the above installation method, the jig platforms can be arranged in sequence from the four corners to the middle according to the predetermined coordinate positions, and the installation positions of each grid ball are occupied by the jig platforms, which is convenient for the subsequent rapid positioning and installation of the grid balls.

[0027] This installation method utilizes the laid positioning track group, and moves these positioning targets with grid balls in sequence from the distal end to the proximal end. The positioning targets and grid balls that move into place first do not affect the movement and installation of the subsequent positioning targets, and these grid balls can be continuously moved and installed in sequence, reducing the waiting time and improving the overall installation efficiency. Since the jig platforms have occupied each fixed-point coordinate position, the coordinate points of the grid balls installed on each jig platform are also accurate, and the overall positioning accuracy is relatively high.

[0028] Adopting this installation method, during the processing and manufacturing of the grid balls, the assembly and installation tooling of the jig platforms and the positioning tracks can be carried out in advance or simultaneously. After the grid balls enter the site, they can be quickly installed directionally through the positioning targets, greatly saving the construction period.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The pre-positioning and targeting installation platform for the lower chord balls of the grid can provide an accurate positioning and installation platform for pre-positioning the grid balls through the settings of the falsework platform and the positioning tracks, etc. The positioning and installation of the grid balls are completed orderly by the targeting movement and positioning method of the positioning track group and the positioning target, avoiding the observation obstruction and operation error that may be encountered when directly positioning the grid balls, and fully guaranteeing the construction quality; 2. The sleepers and the adjustable support components arranged on the falsework platform can well support each section of the positioning track, and the adjustable support components can also adjust the elevation of the positioning track so that all the positioning tracks are at the same elevation, which is beneficial to the subsequent rapid positioning and installation of the grid balls; 3. The setting of the load-bearing beam and the bracket can support and connect the limit tray, and there is no direct contact between the limit tray and the positioning track. When the grid ball at this place moves into position, the positioning target can be connected to the limit tray by using the card slot on the limit tray, and the grid ball can be snap-fitted and installed on the raised point of the limit tray; 4. This installation method can continuously move and install these grid balls in sequence, reduce the waiting time, improve the overall installation efficiency, and the overall positioning accuracy is relatively high; 5. This installation method can assemble and install the falsework platform and the positioning track in advance or simultaneously during the processing and manufacturing of the grid balls, and can quickly perform directional installation through the positioning target after the grid balls enter the site, greatly saving the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic overall layout diagram of a pre-positioning and targeting installation platform for the lower chord balls of a grid according to the present invention;

[0031] Figure 2 It is a schematic structural diagram of a single falsework platform according to the present invention;

[0032] Figure 3 It is a schematic structural diagram of a single falsework platform waiting for a positioning track according to the present invention;

[0033] Figure 4 is Figure 2 the sectional structural diagram at A-A in

[0034] Figure 5 is Figure 2 the sectional structural diagram at B-B in

[0035] Figure 6 is Figure 3 the sectional structural diagram of the positioning track at C-C in

[0036] Figure 7 It is a schematic structural diagram of a positioning target connecting a grid ball according to the present invention;

[0037] Figure 8Schematic diagram of the structure of the positioning target of the present invention driving the grid ball to move in the positioning track;

[0038] Figure 9 Schematic diagram of the structure of the positioning target of the present invention driving the grid ball to be installed in place;

[0039] In the figure: 1, fender platform; 2, positioning track; 201, chute; 202, through hole; 3, sleeper; 4, adjustable support assembly; 401, sleeve; 402, support screw; 403, support; 5, load guiding beam; 6, bracket; 601, flange seat; 602, high-strength lightweight spring; 7, limit tray; 701, tray bottom; 702, tray wall; 8, card slot; 9, raised point; 10, spring; 11, partition; 12, sliding bead; 13, limit baffle; 14, positioning target; 15, grid ball. Detailed implementation manners

[0040] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] Such as Figures 1 to 9As shown in the figure, a pre-positioning and targeting installation platform for the lower chord balls of a grid structure includes a number of formwork platforms 1 arranged in an array. On the number of formwork platforms 1, connected positioning tracks 2 are arranged in a row and column layout; on each formwork platform 1, a sleeper 3 is respectively provided, and an adjustable support assembly 4 is provided on the sleeper 3 for supporting the positioning track 2. A load-bearing beam 5 is also provided on the formwork platform 1. A limit tray 7 is supported and connected on the load-bearing beam 5 through a bracket 6. A card slot 8 is provided on the bottom 701 of the limit tray 7, and a plurality of raised points 9 are provided on the inner side of the wall 702 of the limit tray 7. The raised points 9 are used for clamping the grid ball 15; the positioning track 2 on each formwork platform 1 respectively passes through the limit tray on the corresponding formwork platform, and the arrangement height of the positioning track 2 is lower than the raised points 9 and keeps a distance from the bottom 701; a sliding groove 201 is provided on the positioning track 2, and the sliding groove 201 is used for slidably connecting a positioning target 14. The positioning target 14 is used for connecting the grid ball 15 and driving the grid ball 15 to move along the positioning track 2; through holes 202 are respectively provided on the positioning track 2 corresponding to each card slot 8. When the positioning target 14 drives the grid ball 15 to move to a fixed-point position, the positioning target 14 is docked with the card slot 8 below through the through hole 202, so that the grid ball 15 falls on the raised points 9.

[0043] Through the settings of the formwork platform 1 and the positioning track 2, etc., this pre-positioning and targeting installation platform for the lower chord balls of the grid structure can provide a precise positioning and installation platform for the pre-positioning of the grid balls 15, and orderly complete the positioning and installation of the grid balls by using the targeting movement and positioning method of the positioning track group and the positioning target, avoiding the observation obstruction and operation errors that may be encountered when directly positioning the grid balls, and fully guaranteeing the construction quality.

[0044] Through the formwork platforms 1 arranged in an array, it is very convenient to lay the positioning tracks 2 that penetrate each formwork platform 1, and use the sliding groove 201 in the positioning track 2 to move the positioning target 14 with the grid ball, so as to achieve the purpose of quickly positioning and installing the grid ball 15. The sleepers 3 and the adjustable support assemblies 4 provided on the formwork platform 1 can well support each section of the positioning track 2, and the adjustable support assembly 4 can also adjust the elevation of the positioning track 2, so that all the positioning tracks 2 are at the same elevation, which is beneficial to the subsequent quick positioning and installation of the grid balls.

[0045] The settings of the load-bearing beam 5 and the bracket 6 can support and connect the limit tray 7. The limit tray 7 itself does not contact the positioning track 2, but allows the positioning track 2 to pass through these limit trays 7. When the grid ball at this place moves in place, the card slot 8 on the limit tray 7 can be used to connect the positioning target 14, and the grid ball 15 can be clamped and installed on the raised points 9 of the limit tray 7.

[0046] Furthermore, the sleepers 3 and the load guiding beams 5 on the same formwork platform 1 are arranged in parallel, and a pair of the sleepers 3 are symmetrically arranged on both sides; the height of the positioning track 2 supported by the adjustable support assemblies 4 is higher than the height of the limiting tray 7 supported by the brackets 6.

[0047] Furthermore, two of the adjustable support assemblies 4 are symmetrically arranged on the same sleeper 3. The adjustable support assembly 4 includes a sleeve 401 fixed on the sleeper. A socket screw 402 is sleeved in the sleeve 401. A circular socket 403 is arranged at the end of the socket screw 402. The socket 403 is connected to the positioning track 2. An adjusting nut is also sleeved on the socket screw 402.

[0048] The height of the socket screw 402 in the sleeve 401 can be adjusted by using the adjusting nut, so that the support height of the positioning track 2 can be adjusted. The arrangement of the circular socket 403 facilitates the snap connection with the convex plate below the positioning track 2, and has the functions of limiting and positioning.

[0049] Furthermore, the bracket 6 is arranged in the middle of the load guiding beam 5, that is, at the central position of the formwork platform 1. The bracket 6 includes a flange seat 601 fixed on the load guiding beam 5. A high-strength lightweight spring 602 is arranged in the sleeve structure on the flange seat 601. The limiting tray 7 is installed on the high-strength lightweight spring 602.

[0050] The high-strength lightweight spring 602 can be compressed in the sleeve structure under the action of an external force. After the positioning target and the grid ball are moved into place, when pressing down to make the positioning target combine with the card slot, the high-strength lightweight spring can also be pressed into the flange seat.

[0051] Furthermore, the limiting tray 7 includes the integrally formed tray bottom 701 and a pair of tray walls 702. The pair of tray walls 702 are symmetrically arranged on both sides of the positioning track; two convex points 9 are symmetrically arranged above the inner side of each tray wall 702 respectively. An arc surface or an inclined surface for supporting the grid ball 15 is arranged on the convex point 9. The distance between the pair of convex points 9 on both sides is not less than the width of the positioning track 2, which is convenient for the installation of the positioning track and also convenient for supporting the falling grid ball.

[0052] Further, the sliding groove 201 is an inverted T-shaped sliding groove provided in the positioning track 2. A plurality of springs 10 are respectively provided on both inner sides of the sliding groove 201. A partition 11 is provided at the end of the spring 10. A sliding bead 12 is provided outside the partition 11. Limit baffles 13 are respectively provided on the upper and lower sides inside the sliding groove 201. The limit baffles 13 are used for limiting the sliding bead 12. A part of the outer circumference of the sliding bead 12 protrudes from the spacing of the limit baffles 13 to act on the positioning target.

[0053] Utilizing the sliding groove 201 and the sliding bead 12 provided in the sliding groove is conducive to the positioning target 14 moving quickly and smoothly along the sliding groove 201. The spring 10 is provided between the sliding bead 12 and the sliding groove 201 to make it have a certain elastic force, which is conducive to the surface of the sliding bead abutting against the positioning target, but does not limit the positioning target. The partition and the limit baffle can form a limiting space to accommodate the sliding bead.

[0054] Further, the spacing between a pair of the limit baffles 13 on both sides is greater than the diameter of the through hole 202, and the diameter of the through hole 202 is greater than the width of the upper opening of the sliding groove 201. Such a setting does not affect the downward movement of the positioning target at the designated position; Convex plates are further provided on both sides below the positioning track 2. A pair of the convex plates are used for clamping the adjustable support assembly.

[0055] Further, the positioning target 14 is an inverted T-shaped round screw rod. The diameter of the screw cap of the positioning target 14 is adapted to the inner diameters of the through hole and the card slot, and is basically the same, just allowing the screw cap to pass through. The grid balls 15 are respectively welded and fixed to the ends of the positioning target 14.

[0056] Further, the jig platforms 1 are arranged in an array in rows and columns. A row of the positioning tracks 2 is arranged on each column of the jig platforms 1, and a row of the positioning tracks 2 is arranged on the outermost row of the jig platforms 1. A row of the positioning tracks communicates with multiple columns of the positioning tracks to form a track group.

[0057] A method for pre-positioning and target installation of the lower chord balls of a grid structure includes the following steps:

[0058] (1) Precast the positioning track 2, and prepare the jig platform 1, the adjustable support assembly 4, the sleeper 3, the load guiding beam 5, the bracket 6 and the limit tray 7;

[0059] (2) Weld and fix the sleeper 3 and the load guiding beam 5 on the jig platform 1 respectively, then weld and fix the sleeve 401 of the adjustable support assembly 4 on the sleeper 3, install the bracket 6 on the load guiding beam 5, and weld and install the limit tray 7 on the bracket 6;

[0060] (3) Set out the position and locate. First, determine the predetermined coordinates of the four grid balls at the four corners in the rectangular array, such as the grid ball coordinates of No. 1, No. 6, No. 49, and No. 54, and install the jig platforms 1 at these four positions; then divide the lines to obtain the predetermined coordinates of the other tennis racks in the rectangular array, and install the remaining jig platforms 1. The center points of all the jig platforms 1 are respectively located at the center points of the corresponding predetermined coordinates;

[0061] (4) Set up the positioning tracks 2. Measure and transfer the elevation of the upper line of the positioning tracks 2 on each of the jig platforms 1, and level all the positioning tracks to the same elevation through the adjustable support assemblies 4, and weld the positioning tracks 2 to form an integral body;

[0062] (5) After the grid balls 15 enter the site, weld the positioning targets 14 at the bottom of the grid balls 15. Install the grid balls 15 in sequence from the distal end to the proximal end at the open end of the proximal positioning track, that is, send the grid balls with the positioning targets 14 into the sliding grooves 201 from the open end of the positioning track 2. After sliding to the installation position of the predetermined coordinates, the positioning targets 14 pass through the through holes 202 on the positioning track 2 and engage with the card slots 8 on the limit trays 7 to complete the positioning and installation of a single grid ball, and then complete the installation of the remaining grid balls in sequence.

[0063] If the process of assembling the grid on the ground and lifting the whole grid is adopted, after the lifters are installed in place and loaded, before starting the lifting, remove the devices of the present invention and cut off the positioning targets at the bottom of the grid balls.

[0064] If the process of installing the grid in situ at high altitude is adopted, after the grid is installed, remove the devices of the present invention and cut off the positioning targets at the bottom of the grid balls to facilitate the subsequent construction process of the steel structure.

[0065] Through the above installation method, the jig platforms 1 can be arranged in sequence from the four corners to the middle according to the predetermined coordinate positions. By occupying the positioning and installation positions of each grid ball 15 with the jig platforms 1, it is convenient for the subsequent rapid positioning and installation of the grid balls.

[0066] This installation method utilizes the laid positioning track group, and moves these positioning targets with grid balls in sequence from the distal end to the proximal end. The positioning targets and grid balls that move into place first do not affect the movement and installation of the subsequent positioning targets, and these grid balls can be continuously moved and installed in sequence, reducing the waiting time and improving the overall installation efficiency. Since the jig platforms have occupied each fixed-point coordinate position, the coordinate points of the grid balls installed on each jig platform are also accurate, and the overall positioning accuracy is relatively high.

[0067] By adopting this installation method, during the processing and manufacturing of the grid ball, the assembly of the jig platform and the positioning track and the installation tooling can be carried out in advance or simultaneously. After the grid ball arrives at the site, it can be quickly and directionally installed through the positioning target, greatly saving the construction period.

[0068] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-positioning and targeting installation platform for the lower chord balls of a grid structure, characterized in that, it includes a number of falsework platforms arranged in an array, and connected positioning tracks are arranged on the number of falsework platforms in a row and column arrangement; sleeper beams are respectively provided on each falsework platform, and adjustable support components are provided on the sleeper beams for supporting the positioning tracks. A load guiding beam is also provided on the falsework platform, and a limit tray is supported and connected to the load guiding beam through a bracket. A card slot is provided on the bottom of the limit tray, and a plurality of raised points are provided on the inner side of the wall of the limit tray. The raised points are used for clamping the grid structure balls; the positioning tracks on each falsework platform respectively pass through the limit trays on the corresponding falsework platforms, and the arrangement height of the positioning tracks is lower than the raised points and keeps a distance from the bottom of the tray; a sliding groove is provided on the positioning track, and the sliding groove is used for slidably connecting a positioning target. The positioning target is used for connecting the grid structure ball and driving the grid structure ball to move along the positioning track; through holes are respectively provided on the positioning track corresponding to each card slot. After the positioning target drives the grid structure ball to move to a fixed point position, the positioning target is docked with the card slot below through the through hole, so that the grid structure ball falls on the raised points.

2. The pre-positioning and targeting installation platform for the lower chord balls of a grid structure according to claim 1, characterized in that, the sleeper beam and the load guiding beam on the same falsework platform are arranged in parallel, and a pair of sleeper beams are symmetrically arranged on both sides; the height of the positioning track supported by the adjustable support component is higher than the height of the limit tray supported by the bracket.

3. The pre-positioning and targeting installation platform for the lower chord balls of a grid structure according to claim 1, characterized in that, two adjustable support components are symmetrically arranged on the same sleeper beam. The adjustable support component includes a sleeve fixed on the sleeper beam, a support seat screw is sleeved in the sleeve, a circular support seat is provided at the end of the support seat screw, the support seat is connected to the positioning track, and an adjusting nut is also sleeved on the support seat screw.

4. The pre-positioning and targeting installation platform for the lower chord balls of a grid structure according to claim 1, characterized in that, the bracket is arranged in the middle of the load guiding beam. The bracket includes a flange seat fixed on the load guiding beam, a high-strength and lightweight spring is arranged in the sleeve structure on the flange seat, and the limit tray is installed on the high-strength and lightweight spring.

5. The pre-positioning and targeting installation platform for the lower chord balls of a grid structure according to claim 1, characterized in that, the limit tray includes the bottom of the tray and a pair of side walls formed integrally. Two raised points are symmetrically arranged on the upper part of the inner side of each side wall respectively. An arc surface or an inclined surface for supporting the grid structure ball is provided on the raised points, and the distance between a pair of raised points on both sides is not less than the width of the positioning track.

6. The pre-positioning and targeting installation platform for the lower chord balls of a grid structure according to claim 1, characterized in that, The chute is an inverted T-shaped chute arranged in the positioning track. On both sides inside the chute, a number of springs are respectively provided. At the end of each spring, a partition board is provided. Outside the partition board, a sliding bead is provided. On the upper and lower sides inside the chute, limit baffles are also respectively provided. The limit baffles are used for limiting the sliding beads. A part of the outer circumference of the sliding bead exposes from the spacing of the limit baffles to act on the positioning target.

7. The pre-positioning and targeting installation platform for the lower chord balls of a grid frame according to claim 6, wherein, the spacing between a pair of the limit baffles on both sides is greater than the diameter of the through hole, and the diameter of the through hole is greater than the width of the opening above the chute; on both sides below the positioning track, convex plates are further provided. A pair of the convex plates are used for clamping the adjustable support assembly.

8. The pre-positioning and targeting installation platform for the lower chord balls of a grid frame according to claim 1, wherein, the positioning target is an inverted T-shaped round screw rod. The diameter of the screw cap of the positioning target is adapted to the inner diameters of the through hole and the card slot. The grid frame balls are respectively welded and fixed at the ends of the positioning target.

9. The pre-positioning and targeting installation platform for the lower chord balls of a grid frame according to claim 1, wherein, the jig platforms are arranged in an array in rows and columns. On each column of the jig platforms, a row of the positioning tracks is arranged. On at least one row of the jig platforms, a row of the positioning tracks is arranged. A row of the positioning tracks communicates with multiple columns of the positioning tracks to form a track group.

10. A method for pre-positioning and targeting the installation of the lower chord balls of a grid frame having the pre-positioning and targeting installation platform for the lower chord balls of a grid frame according to any one of claims 1 to 9, wherein, it includes the following steps: (1) Prefabricate the positioning track, and prepare the jig platform, the adjustable support assembly, the sleeper, the load guiding beam, the bracket and the limit tray; (2) Weld and fix the sleeper and the load guiding beam on the jig platform respectively. Then fixedly install the adjustable support assembly on the sleeper, install the bracket on the load guiding beam, and install the limit tray on the bracket; (3) Set out the positions. First, determine the predetermined coordinates of four grid frame balls at the four corners in the rectangular array, and install the jig platforms at these four positions. Then divide the lines to obtain the predetermined coordinates of other grid frame balls in the rectangular array, and install the remaining jig platforms. The center points of all the jig platforms are respectively located at the center points of the corresponding predetermined coordinates; (4) Set the positioning track. Measure and check the elevation of the upper mouth line of the positioning track on each jig platform, and level all the positioning tracks to the same elevation through the adjustable support assembly, and weld the positioning tracks to form an integral body; (5) After the grid frame balls enter the site, weld the positioning target at the bottom of the grid frame balls. Install the grid frame balls in sequence from the distal end to the proximal end from the opening end of the proximal positioning track, that is, send the grid frame balls with the positioning target into the chute from the opening end of the positioning track. After sliding to the installation point of the predetermined coordinate, the positioning target passes through the through hole on the positioning track and meshes with the card slot on the limit tray to complete the positioning installation of a single grid frame ball, and then complete the installation of the remaining grid frame balls in sequence.

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