Device and method for installing a grid above an existing structure

Abstract

The application relates to the technical field of net rack construction, and provides a device and a construction method for net rack installation and construction above an existing structure, which comprises one or more device units; each device unit comprises a first lattice column, a rigid platform, a second lattice column, a power platform, an adjustable semi-rigid positioning guide component and a traction system; the adjustable semi-rigid positioning guide component comprises a plurality of positioning guide pieces distributed around the rigid platform, one end of each positioning guide piece is hinged to the rigid platform, the other end is a cantilever end, and the cantilever end of the positioning guide piece is connected with a traction rope of the traction system; the traction system adjusts the tightness of the traction rope to realize height adjustment of the positioning guide piece; a plurality of positioning adjusting pieces are arranged at intervals along the length direction of the positioning guide piece, the positioning adjusting pieces are used for suspending and connecting the net rack and adjusting the height of the net rack. The application can cope with complex ground conditions, is convenient to disassemble and assemble, has high installation precision, a short construction period, a simple stress system and low safety risks.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of net rack construction, and particularly relates to a device and a construction method for installing a net rack above an existing structure. BACKGROUND

[0002] Nowadays, with the acceleration of urbanization, industrial building groups not only meet the process production demand, but also need to cater to the humanistic demand, and the 'deindustrialization' reconstruction project gradually increases, especially for the large building group of power plant buildings and its specific image. The span, length and height of the steel net rack structure used in the peripheral closed 'deindustrialization' reconstruction reach the super-dangerous engineering scale, the power plant building group is uneven in height, and the construction of the top steel net rack structure cannot affect the industrial production.

[0003] The following methods are mainly used to install the large-span high-altitude net rack above the existing structure:

[0004] The first method is to use full-frame scaffolding to support the working surface to install the net rack. This construction method requires a lot of working materials, takes a long time, has high cost and low efficiency.

[0005] The second method is to use a crane to lift and install the net rack in different areas, which can save time, but the passageway between the building groups is narrow and lacks assembly space, and the peripheral assembled net rack cannot be transferred to the middle area.

[0006] The third method is to use the whole or partial lifting method or the jacking method. However, the power plant building group is uneven in height, it is difficult to form a unified height assembly working surface, and the cost is high.

[0007] The fourth method is to use the piecewise sliding method, but the space between the lattice columns under the net rack is large and the lattice columns are not completely regularly arranged, so the sliding measure needs to be large, and due to the lower building group, the sliding measure assembly is difficult, and after the installation is completed, the sliding measure needs to be removed with high safety requirements.

[0008] The fourth method is to use the high-altitude scattered assembly method, but the precision of high-altitude operation is difficult to control, the risk is high, and in order to reduce the difficulty of closing, only point-to-surface operation can be performed, so the time is consumed. SUMMARY

[0009] The present application aims to overcome the shortcomings of the prior art and provide a device and a construction method for installing a net rack above an existing structure, which can cope with complex ground conditions, is convenient to disassemble and assemble, has high installation precision, short construction period, simple stress system and low safety risk.

[0010] In a first aspect, the present application provides a device for installing a net rack above an existing structure, comprising one or more device units; each device unit comprises a first lattice column, a rigid platform, a second lattice column, a powered platform, an adjustable semi-rigid positioning guide assembly, and a traction system; the first lattice column is vertically arranged, and the rigid platform is connected to the first lattice column; the second lattice column is mounted on the rigid platform, and the powered platform is arranged on the second lattice column; the adjustable semi-rigid positioning guide assembly comprises a plurality of positioning guides distributed around the rigid platform, one end of each positioning guide is hinged to the rigid platform, and the other end is a cantilever end, and the cantilever end of the positioning guide is connected to a traction rope of the traction system; the traction system adjusts the tightness of the traction rope to achieve height adjustment of the positioning guide; the positioning guide is provided with a plurality of positioning adjustment members at intervals along its length direction, and the positioning adjustment members are used for suspending and connecting the net rack and adjusting the height of the net rack.

[0011] Further, the positioning guide comprises a plurality of guide beams sequentially hinged along its length direction; the guide beams are provided with the positioning adjustment members; the adjustable semi-rigid positioning guide assembly further comprises a cable, one end of which is connected to the guide beam, and the other end is connected to the second lattice column.

[0012] By sequentially hinging a plurality of guide beams to form a positioning guide, and connecting the guide beam and the second lattice column by a cable, the structure of each guide beam is stable, and the height of the guide beam can be individually fine-adjusted, so as to improve the installation precision of the net rack. In addition, the positioning guide is lengthened by the guide beam, and the length of the positioning guide can be flexibly adjusted according to the installation requirements of the net rack, which is convenient for construction.

[0013] Further, the adjustable semi-rigid positioning guide assembly further comprises a horizontal bracing beam connected between two positioning guides.

[0014] By connecting two positioning guides by a horizontal bracing beam, the positioning guide forms a stable statically determinate structure, and the positioning guide does not shake when the construction personnel moves or operates on the guide beam, thereby improving the construction safety.

[0015] Further, the device unit further comprises a total station and a plurality of prisms distributed on the installed net rack, and the total station and the prisms are used in cooperation to detect the installation error of the net rack.

[0016] By cooperating the total station and the prisms to detect the installation error of the net rack, the height of the net rack connected to the positioning adjustment member can be adjusted, and the installation precision of the net rack is further improved.

[0017] Further, the traction system comprises a plurality of traction assemblies distributed around the power platform; each traction assembly comprises a truss support and a traction device, one end of the truss support is rotationally connected with the power platform, and the other end is connected with the traction device; the traction device comprises a traction driving member and a traction rope; the traction driving member is used for adjusting the tightness of the traction rope, and the traction rope is connected with the overhanging end of the positioning guide.

[0018] Further, the traction system further comprises an adjustable tie flexible cable; the adjustable tie flexible cable is connected head to tail to tie all the truss supports in sequence to constrain the rotation angle of the truss supports.

[0019] By connecting all the truss supports into an integral structure through the adjustable tie flexible cable, the rotation angle of the truss supports is constrained, the stability of the positioning guide is avoided from being affected by the rotation of the truss supports, and the safety and installation precision are improved.

[0020] Further, the power platform comprises a steel platform and a control cabinet; the steel platform is arranged at the top end of the second lattice column, and the control cabinet is arranged on the steel platform and electrically connected with the traction driving member.

[0021] Further, the device unit further comprises one or more balance beams, and the balance beams are connected with the positioning guides.

[0022] By arranging the balance beams, the balance of the positioning guides connected on the rigid platform is ensured, and the length inconsistency of the positioning guides on both sides of the rigid platform is avoided to affect the structural safety.

[0023] Further, a plurality of the device units are arranged in an array; the overhanging ends of one or two positioning guides of adjacent device units are connected.

[0024] By connecting the overhanging ends of the device units, the positioning guides of each device unit are connected to form a net-shaped support above the existing structure, the net-shaped support forms a stable structural system, provides a working surface and positioning guide for the installation of the net rack, improves the precision and convenience of the installation of the net rack, and reduces the safety risk.

[0025] In a second aspect, the application further provides a construction method for installing a net rack above an existing structure by using the device, comprising the following steps:

[0026] According to the structure of the net rack to be installed, finite element analysis of the installation process is performed to determine the size and positioning of the device unit for installing the net rack;

[0027] According to the determined size and positioning, the device unit is assembled, and the height of the positioning guide is adjusted to the first target height by using the traction system of the device unit.

[0028] The upper chord bolt ball of the grid frame is connected by each positioning adjusting member on the positioning guide respectively, and the upper chord bolt ball is adjusted to the second target height by the positioning adjusting member;

[0029] According to the position of the installed upper chord bolt ball, the upper chord, the web and the lower chord of the grid frame are installed until the grid frame is completed.

[0030] The beneficial effects of the present application include: by installing a rigid platform on the first lattice column, installing an adjustable semi-rigid positioning guide assembly on the rigid platform, adjusting and controlling the height of the adjustable semi-rigid positioning guide assembly by the traction system, and making the positioning guide form a stable statically determinate structure, the adjustable semi-rigid positioning guide assembly is above the grid frame to be installed, the adjustable semi-rigid positioning guide assembly is used as a construction operation surface, the grid frame is assembled along the length direction of the adjustable semi-rigid positioning guide assembly, and the height of the grid frame connected with the adjustable semi-rigid positioning guide assembly is adjusted by the positioning adjusting member on the positioning guide of the adjustable semi-rigid positioning guide assembly, the installation precision control of the grid frame is realized, and the safety quality risk is reduced. Since the rigid platform is installed on the first lattice column, complex ground conditions can be coped with, each device unit can be flexibly arranged, is not affected by the existing structure of the ground, and the height of the first lattice column can be flexibly adjusted according to the height of the existing structure. Even if the existing structure is uneven, it can also be well applied. In addition, the device unit can be recycled, which can reduce the construction cost. Compared with the existing full-frame, integral lifting and high-altitude scattered installation methods, complex ground conditions can be coped with, the device unit is convenient to disassemble and assemble, the installation precision is high, the construction period is short, the stress system is simple, and the safety risk is low. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application.

[0032] Figure 2 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application. Figure 1 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application.

[0033] Figure 3 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application. Figure 1 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application.

[0034] Figure 4 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application. Figure 3 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application.

[0035] Figure 5 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application. Figure 1 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application.

[0036] Figure 6 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application. Figure 1 It is a front view of a device unit of the device for grid frame installation construction above the existing structure of the present application.

[0037] Figure 7 for Figure 6 A top-down view.

[0038] Figure 8 for Figure 1 A magnified front view of a guide beam for a positioning guide component.

[0039] Figure 9 for Figure 1 A top-view diagram of the traction system.

[0040] Figure 10 for Figure 9 A front view schematic diagram of a traction component of a traction system.

[0041] Figure 11 for Figure 1 A schematic diagram of a mesh unit with a mesh frame suspended on an adjustable semi-rigid positioning guide assembly of the device unit.

[0042] Figure 12 for Figure 11 An enlarged schematic diagram of the guide beam connected to the upper chord bolt ball of the space frame via positioning guides.

[0043] Figure 13 for Figure 12 An enlarged structural diagram of the positioning guide.

[0044] Figure 14 for Figure 13 A side sectional view of the positioning bolts and positioning sleeve.

[0045] Figure 15 for Figure 11 An enlarged schematic diagram of a prism mounted on the upper or lower chord bolt ball of a mesh unit.

[0046] Figure 16 for Figure 11 A top view diagram showing that each of the two device units is equipped with several mesh units.

[0047] Figure 17 for Figure 16 The front view diagram shows two device units, each equipped with more mesh units.

[0048] Figure 18 for Figure 17 A top-down view.

[0049] Figure 19 for Figure 17 A front view diagram showing the addition of another set of device units on the side of the device unit away from the side wall.

[0050] Figure 20 for Figure 19 A top-down view.

[0051] Figure 21 for Figure 19 A front view diagram showing the addition of another set of device units on the side of the device unit away from the side wall.

[0052] Figure 22 for Figure 21 A top-down view.

[0053] Figure 23 for Figure 22 A top view of the device unit after each device unit is fully equipped with mesh units, and another set of device units is added in the other direction of the device unit.

[0054] In the diagram, 100 - device unit; 10 - first lattice column; 20 - rigid platform; 21 - steel column; 22 - column top connecting rod; 23 - horizontal frame; 24 - first connecting lug plate; 30 - second lattice column; 31 - second connecting lug plate; 40 - power platform; 41 - steel platform; 411 - steel beam; 412 - steel plate; 42 - control cabinet; 50 - traction system; 51 - traction component; 511 - truss support; 5111 - vertical truss; 5112 - horizontal truss; 5113 - inclined truss; 512 - traction drive component; 513 - traction rope; 52 - adjustable tie-up flexible steel cable ; 60-Positioning guide; 61-Guide beam; 62-Third connecting ear plate; 63-Horizontal support beam; 70-Cable; 80-Positioning adjustment component; 81-Connecting seat; 82-Positioning sleeve; 821-Slot; 822-Scale line; 83-Adjusting screw; 84-Limit pin; 90-Balance beam; 110-Prism; 111-L-shaped steel base; 112-First bolt; 113-Second bolt; 200-Space frame; 210-Network unit; 211-Upper chord bolt ball; 212-Upper chord; 213-Web member; 214-Lower chord; 215-Lower chord bolt ball; 300-Side wall. Detailed Implementation

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] The device of the present invention for the installation of a space frame above an existing structure includes one or more device units 100. The number of device units 100 and the distribution position of each device unit 100 can be flexibly selected according to the size of the space frame 200 and the distribution position of the existing structure.

[0057] like Figure 1 , Figure 2 As shown, each device unit 100 includes a first lattice column 10, a rigid platform 20, a second lattice column 30, a power platform 40, an adjustable semi-rigid positioning guide assembly, and a traction system 50.

[0058] The first lattice column 10 is erected on the ground or an existing structure, and of course, the first lattice column 10 can also be an existing structure. The height of the first lattice column 10 can be adjusted as needed.

[0059] The rigid platform 20 is connected with the first lattice column 10. The rigid platform 20 is preferably arranged at the top of the first lattice column 10.

[0060] As shown in Figure 3 , Figure 4 , the rigid platform 20 includes steel columns 21, column top connecting rods 22, and horizontal frames 23. The steel columns 21 are four in number and are arranged at the top of the four corners of the first lattice column 10. The bottom of the steel column 21 is bolted to the first lattice column 10, and the top of the four steel columns 21 is connected and fixed by four column top connecting rods 22. The horizontal frame 23 is arranged at the periphery of the steel column 21, and the horizontal frame 23 includes horizontal crossbars and horizontal longitudinal bars arranged in a crisscross manner. There are four horizontal crossbars and four horizontal longitudinal bars, and the four horizontal crossbars are parallel to each other, and the four horizontal longitudinal bars are parallel to each other. Among them, two horizontal crossbars and two horizontal longitudinal bars are connected to form a horizontal rectangular frame structure, and the other two horizontal crossbars and two horizontal longitudinal bars are fixedly connected in a crisscross manner at the periphery of the four steel columns 21 and are supported and connected on the inner side of the rectangular frame structure, thereby forming a stable rigid platform 20. The rectangular frame structure of the rigid platform 20 has four corners, and each corner is provided with three first connecting lugs 24. Of course, more or fewer first connecting lugs 24 can also be provided. The first connecting lug 24 is used to be connected with the positioning guide 60 of the adjustable semi-rigid positioning guide assembly, which will be described in detail later.

[0061] As shown in Figure 1 , Figure 5 , the second lattice column 30 is installed on the rigid platform 20, and the structure of the second lattice column 30 can be the same as that of the first lattice column 10. The second lattice column 30 includes a plurality of lattice column units spliced along the height direction thereof, and the number of the lattice column units can be flexibly adjusted according to needs, so as to realize the height adjustment of the second lattice column 30.

[0062] Each lattice column unit includes four vertical columns, horizontal crossbars, and inclined braces connected between the four vertical columns. The outer side of the vertical column is provided with a second connecting lug 31. The second connecting lug 31 is used to be connected with the cable 70 of the adjustable semi-rigid positioning guide assembly, which will be described in detail later.

[0063] As shown in Figure 1 , Figure 6 , Figure 7 , the power platform 40 is arranged on the second lattice column 30.

[0064] The power platform 40 comprises a steel platform 41 and a control cabinet 42; the steel platform 41 is arranged at the top end of the second lattice column 30, i.e. at the top end of the uppermost lattice column unit of the second lattice column 30, and the control cabinet 42 is arranged on the steel platform 41 and is used to be electrically connected with the traction driving member 512 of the traction system 50. The steel platform 41 comprises steel beams 411 and a steel plate 412; there are three steel beams 411 which are horizontally arranged at the top end of the second lattice column 30, and the steel plate 412 is horizontally arranged on the top of the three steel beams 411; the steel platform 41 is used to provide a working surface for operating the control cabinet 42, and of course, can also be used for the assembly and debugging of the traction system 50.

[0065] As shown in Figure 1 , Figure 2 , the adjustable semi-rigid positioning guide assembly comprises a plurality of positioning guide members 60 distributed around the rigid platform 20; one end of each positioning guide member 60 is hinged to the rigid platform 20, and the other end is a cantilever end; the cantilever end of the positioning guide member 60 is connected with the traction rope 513 of the traction system 50.

[0066] As shown in the accompanying drawings, Figure 4 , the rectangular frame structure of the rigid platform 20 has four corners, and three first connecting lugs 24 are arranged at each corner; the three first connecting lugs 24 are all vertically arranged; the included angle between two of the first connecting lugs 24 is a right angle, and the other first connecting lug 24 is arranged between the two first connecting lugs 24 to divide the 90-degree right angle into two 45-degree angles.

[0067] As shown in the accompanying drawings, Figure 2As shown, each first connecting lug plate 24 is hingedly connected with a positioning guide 60. The hinging manner can adopt pin hinging. Since the end of each positioning guide 60 away from the first connecting lug plate 24 is a cantilever end, and the traction rope 513 of the traction system 50 is connected, the traction system 50 can realize the adjustment of the height or the inclination angle of the positioning guide 60 by adjusting the tightness of the traction rope 513. The height of the positioning guide 60 directly affects the installation height of the grid 200. By adjusting the height of the positioning guide 60 to a first target height by the traction system 50, the installation height of the grid 200 can be limited to be close to the first target height, realizing the preliminary control of the installation height of the grid 200. The positioning guide 60 is provided with a plurality of positioning adjustment members 80 along the length direction thereof, and the positioning adjustment members 80 are used for suspending the connection of the grid 200 and adjusting the height of the grid 200. Since the grid 200 is installed by being divided into a plurality of grid units 210 and being installed one by one, in the embodiment, the positioning guide 60 is provided with at least one positioning adjustment member 80 in the length range corresponding to each grid unit 210, so as to realize the control of the height of each grid unit 210. By adjusting the upper chord bolt ball 211 of the corresponding grid unit 210 to a second target height by the positioning adjustment member 80, the accurate control of the installation height of the grid 200 is realized, and the installation accuracy of the grid 200 is improved.

[0068] As shown in Figure 1 , Figure 2 , Figure 8 As shown, each positioning guide 60 includes a plurality of guide beams 61 hingedly connected in sequence along the length direction thereof; and a third connecting lug plate 62 is arranged on the guide beam 61. The third connecting lug plate 62 is provided with one or two connecting holes. The adjustable semi-rigid positioning guide assembly further includes a cable 70, one end of the cable 70 being connected with the guide beam 61, and the other end being connected with the second lattice column 30. In fact, since there are a plurality of positioning guides 60, and the positioning guide 60 includes a plurality of guide beams 61, in order to improve the safety and stability, the third connecting lug plate 62 of each guide beam 61 is connected with a cable 70, and the cable 70 is connected with the second connecting lug plate 31 of the second lattice column 30.

[0069] In some embodiments, each cable 70 is connected with a length adjustment member for adjusting the length and tension of the cable 70, so as to realize the adjustment of the height or the inclination angle of each guide beam 61.

[0070] The positioning guide 60 can reasonably increase the number of guide beams 61 according to the assembly process of the grid unit 210 of the grid 200, and the newly added guide beam 61 is located at the cantilever end of the positioning guide 60 to replace the guide beam 61 of the original cantilever end of the positioning guide 60, forming a new cantilever end.

[0071] The guide beam 61 is preferably an I-beam, including an upper flange plate, a lower flange plate, and a web plate connecting the upper and lower flange plates. A third connecting lug plate 62 is provided on the upper flange plate, and a positioning adjustment member 80 is provided on the lower flange plate. The positioning adjustment member 80 can be fixed at a specific position on the guide beam 61, or it can slide with the guide beam 61, moving along the length of the guide beam 61, and is equipped with a locking member to lock the positioning adjustment member 80 at any position on the lower flange plate of the guide beam 61. When the locking member is released, the positioning adjustment member 80 can slide along the length of the guide beam 61. The locking member can be a clamp to hold and fix the positioning adjustment member 80 on the guide beam 61.

[0072] Of course, it is not necessary to provide positioning adjustment elements 80 on all guide beams 61 of the positioning guide 60. The guide beams 61 of the positioning guide 60 may include two types: guide beams 61 with positioning adjustment elements 80 and guide beams 61 without positioning adjustment elements 80.

[0073] like Figure 1 , Figure 2 As shown, to improve structural stability, the adjustable semi-rigid positioning guide assembly also includes a horizontal support beam 63, which connects the two positioning guides 60. (See attached diagram) Figure 2 For example, each side of the rigid platform 20 is provided with two parallel positioning guides 60. Multiple horizontal support beams 63 are connected between these two parallel positioning guides 60 at intervals along their length. Since each positioning guide 60 includes multiple guide beams 61, at least one horizontal support beam 63 is provided between every two parallel guide beams 61. The horizontal support beam 63 is connected to the third connecting lug 62 of the guide beam 61.

[0074] like Figure 2 As shown, in order to improve the stability of the positioning guides 60 distributed around the rigid platform 20, multiple horizontal support beams 63 are arranged around the periphery of the rigid platform 20, with at least one ring around the rigid platform 20, so that at least one horizontal support beam 63 is provided between every two positioning guides 60 around the rigid platform 20.

[0075] The more horizontal support beams 63 there are, the higher their density, and the greater the stability and safety of the device unit 100. However, this also makes it more difficult to adjust the angle and height of each guide beam 61; therefore, the number of horizontal support beams 63 should not be excessive.

[0076] When assembling the mesh unit 210 of the space frame 200, the construction workers straddle the guide beam 61 to perform the assembly operation. Of course, the construction workers should be equipped with fall protection ropes, which form a closed loop, with the guide beam 61 located within the closed loop.

[0077] like Figure 1 , Figure 9 ,Figure 10 As shown, the traction system 50 includes four traction components 51 distributed around the power platform 40, specifically at the four corners of the power platform 40. Each traction component 51 includes a truss support 511 and a traction device. One end of the truss support 511 is rotatably engaged with the power platform 40, and the other end is connected to the traction device. The traction device includes a traction drive 512 and a traction rope 513. The traction drive 512 is used to adjust the tension of the traction rope 513, which is connected to the cantilevered end of the positioning guide 60.

[0078] like Figure 10 As shown, the truss support 511 is an upright triangular truss, including a vertical truss 5111, a horizontal truss 5112, and an inclined truss 5113 connected together. A bearing is installed inside the vertical truss 5111, with its axis vertically aligned. A shaft is fitted inside the bearing and vertically connected to the power platform 40. With the rotational engagement of the bearing and shaft, the vertical truss 5111 rotates relative to the power platform 40 around the bearing's axis, thereby achieving the rotation of the truss support 511. A traction device is located at the end of the horizontal truss 5112 of the truss support 511 that is furthest from the vertical truss 5111. In this embodiment, the traction device is preferably a constant-speed electric hoist.

[0079] like Figure 9 As shown, the traction system 50 also includes adjustable flexible steel cables 52; these cables are connected end-to-end to sequentially connect all truss support members 511 to constrain their rotation angle. The adjustable flexible steel cables 52 can be four flexible steel cables, each corresponding to one of the four truss support members 511. That is, a steel cable connects every two truss support members 511 along the circumference of the power platform 40. The length of the steel cable is adjustable to allow it to move closer to the two truss support members 511 it connects to. When all four steel cables are taut, the four truss support members 511 are fixed. Alternatively, the adjustable flexible steel cables 52 can be a single, continuous cable, sequentially connecting all truss support members 511 along the circumference of the power platform 40; when the cable is taut, all four truss support members 511 are fixed. When the adjustable ties 52 are loosened or relaxed, the truss support 511 can rotate, and its rotation angle can be adjusted to adjust the orientation of the traction device relative to the rigid platform 20.

[0080] like Figure 11As shown, the device unit 100 also includes one or more balance beams 90, which are connected to the positioning guides 60. The balance beams 90 are mounted on two parallel positioning guides 60. When the mesh unit 210 on one side of the rigid platform 20 is installed and another mesh unit 210 is installed on the other side of the rigid platform 20, balance beams 90 can be installed at appropriate positions on the positioning guides 60 to reduce the lateral displacement of the first lattice column 10 and ensure balanced force on both sides of the rigid platform 20. The location and number of balance beams 90 are determined based on finite element analysis calculations.

[0081] like Figures 12 to 14 As shown, the positioning adjustment component 80 includes a connecting seat 81, a positioning sleeve 82, and an adjusting screw 83. The upper end of the connecting seat 81 is connected to the guide beam 61, and the connection method can be welding, bolting, or the sliding fit mentioned above. The connecting seat 81 includes a connecting plate at its lower end, and a through hole is provided on the connecting plate. The adjusting screw 83 is vertically inserted into the through hole. The adjusting screw 83 includes a screw body and a screw end set at the top of the screw body. The screw end is located above the connecting plate, and the screw body passes through the through hole and is movably engaged with the connecting plate, that is, the screw body can rotate freely and move vertically to a certain extent.

[0082] The positioning sleeve 82 has a groove 821 on its side wall, with the groove 821 extending along the length of the positioning sleeve 82. A scale line 822 is located on one side of the positioning sleeve 82, near the groove 821. A limit pin 84 is fixedly connected to one side of the adjusting screw 83. The positioning sleeve 82 is located below the connecting plate and is movably fitted around the adjusting screw 83. The limit pin 84 passes through the groove 821 of the positioning sleeve 82. In some embodiments, a pointer is also provided at the end of the limit pin 84, pointing to the scale line 822. The length of the adjusting screw 83, particularly the length of the screw body, is longer than the length of the positioning sleeve 82; in other words, the lower end of the adjusting screw 83 extends below the positioning sleeve 82 for connection with the space frame 200, specifically for threaded connection with the upper chord bolt ball 211 of the space frame 200.

[0083] By rotating the positioning sleeve 82, the limiting pin 84 is driven to rotate, which in turn drives the adjusting screw 83, which is fixedly connected to the limiting pin 84, to rotate, thereby controlling the engagement depth between the adjusting screw 83 and the upper chord bolt ball 211. The positioning sleeve 82 is in a free-falling state, and the limiting pin 84 is located at the top of the slot 821. When the adjusting screw 83 is connected to the upper chord bolt ball 211 to a certain depth, the lower end of the positioning sleeve 82 abuts against the upper end of the upper chord bolt ball 211. As the adjusting screw 83 continues to tighten, the positioning sleeve 82 rises, and the position of the limiting pin 84 relative to the scale line 822 changes. Based on this principle, the engagement depth between the adjusting screw 83 and the upper chord bolt ball 211 can be controlled. For example, based on the second target height of the upper chord bolt ball 211 determined through analysis and calculation, and combined with the known lengths of the adjusting screw 83 and the positioning sleeve 82, it can be determined that when the upper chord bolt ball 211 is engaged with the adjusting screw 83 to the second target height, the scale line 822 corresponding to the limit pin 84 caused by the rising of the positioning sleeve 82 is the target scale. Therefore, by continuously rotating the positioning sleeve 82 until the target scale on one side of its slot 821 is at the same horizontal plane as the limit pin 84, the upper chord bolt ball 211 is suspended to the second target height by the adjusting screw 83, achieving precise control of the installation height of the upper chord bolt ball 211. The installation height of the upper chord bolt ball 211 directly affects the installation height of the upper chord rod 212, web rod 213, and lower chord rod 214 of the space frame 200, ultimately affecting the installation accuracy of the space frame 200. Therefore, precise control of the installation height of the upper chord bolt ball 211 improves the installation accuracy of the space frame 200.

[0084] In some embodiments, when the limiting pin 84 and the slot 821 of the positioning sleeve 82 slide vertically together, they have a frictional damping force, so that the positioning sleeve 82 can be suspended at a certain height by means of the frictional damping of the limiting pin 84, thereby limiting the length of the lower end of the adjusting screw 83 extending below the positioning sleeve 82, and initially calibrating the depth of the engagement between the adjusting screw 83 and the upper chord bolt ball 211. Of course, this frictional damping can be overcome manually by the construction personnel to flexibly change the height of the positioning sleeve 82.

[0085] like Figure 15 As shown, the device unit 100 also includes a total station and multiple prisms 110 distributed on the installed space frame 200. The total station and the prisms 110 work together to detect the installation error of the space frame 200.

[0086] The prism 110 is mounted on the upper chord bolt ball 211 or lower chord bolt ball 215 of the space frame 200 via a mounting bracket. The mounting bracket includes an L-shaped steel base 111, a first bolt 112, and a second bolt 113. The first bolt 112 connects the L-shaped steel base 111 to the upper chord bolt ball 211 or lower chord bolt ball 215. The second bolt 113 is threaded to the side wall of the L-shaped steel base 111, and the prism 110 is fixedly connected to the end of the second bolt 113. The angle of the prism 110 is adjusted by rotating the second bolt 113. The second bolt 113 is horizontally positioned.

[0087] During the installation of the space frame 200, multiple device units 100 are arranged in an array; the cantilevered ends of one or two positioning guides 60 of adjacent device units 100 are connected. The positioning guides 60 of each device unit 100 are connected to form a mesh support above the existing structure. This mesh support forms a stable structural system, providing a working surface and positioning guidance for the installation of the space frame 200, improving the accuracy and convenience of the installation, and reducing safety risks.

[0088] like Figure 16 As shown, two device units 100 are arranged on the inner side of the side wall 300 along the length direction of the side wall 300. The two device units 100 are connected to the cantilevered ends of the positioning guides 60 arranged along the length direction of the side wall 300 between the two rigid platforms 20.

[0089] Based on the same inventive concept, this invention also proposes a construction method for installing the space frame 200 on the top of an existing structure using the above-mentioned device, comprising the following steps:

[0090] Based on the structure of the proposed space frame 200 and the distribution of the existing structure, a finite element analysis of the installation process of the space frame 200 is performed to determine the dimensions and positioning of the device units 100 used for installing the space frame 200. The positioning of the device units 100 includes the required number of device units 100 and the location of each device unit 100. The dimensions of each device unit 100 include the height of each device unit 100, the length and direction of each positioning guide 60, the first target height of the positioning guide 60, and the second target height of the positioning adjustment member 80. The height of each device unit 100 includes the height of the first lattice column 10, the height of the rigid platform 20, and the height of the second lattice column 30.

[0091] According to the determined dimensions and positioning, the assembly unit 100 includes first installing the first lattice column 10, erecting the first lattice column 10 to a suitable height, then installing the rigid platform 20 on the top of the first lattice column 10, then installing the second lattice column 30 on the rigid platform 20, then installing the power platform 40 on the top of the second lattice column 30, then installing the traction system 50, and finally installing the positioning guide 60. Several guide beams 61 are assembled to form a positioning guide 60. The cantilever end of the positioning guide 60 is connected to the traction rope 513, and then all the guide beams 61 of the positioning guide 60 are connected to the second lattice column 30 through the cable 70.

[0092] The height of the positioning guide 60 is adjusted to a first target height using the traction system 50 of the device unit 100. Specifically, this includes adjusting the tension of the traction rope 513 of the traction device using the traction drive 512 of the traction device of the traction system 50, thereby adjusting the height of the positioning guide 60 connected to the traction rope 513 to the first target height.

[0093] Of course, in some embodiments, the height of each guide beam 61 can also be adjusted by the cable 70.

[0094] Once the height of the positioning guide 60 is controlled at the first target height, a horizontal support beam 63 is installed between two parallel positioning guides 60. A horizontal support beam 63 is connected between every two parallel guide beams 61 to form a stable statically determinate structure.

[0095] The upper chord bolt balls 211 of the space frame 200 are connected to the various positioning adjustment components 80 on the positioning guide 60, and the upper chord bolt balls 211 are adjusted to the second target height via the positioning adjustment components 80. Specifically, based on the structure of the space frame 200 and the size and positioning of the device unit 100 for installing the space frame 200, the number, size, and positioning of each mesh unit 210 of the space frame 200 are determined, such as... Figure 11 As shown. Once the mesh unit 210 is determined, the position and number of the upper chord bolt balls 211 of that mesh unit 210 can be determined; thus, the position and number of the positioning adjustment pieces 80 on the positioning guide 60 corresponding to that mesh unit 210 can be determined. This process can be determined in advance on the ground, and the positioning adjustment pieces 80 on the positioning guide 60 can be installed on the ground. Therefore, after the positioning guide 60 is installed on the rigid platform 20, the position of the positioning adjustment piece 80 is determined. The construction personnel straddle the positioning guide 60 and, according to the position of the positioning adjustment piece 80, install the upper chord bolt balls 211 on the positioning adjustment piece 80.

[0096] By rotating the positioning sleeve 82 of the positioning adjustment component 80, the adjustment screw 83 is rotated. When the positioning sleeve 82 is continuously rotated until the target scale on one side of its slot 821 is on the same horizontal plane as the limit pin 84 on one side of the adjustment screw 83, the upper chord bolt ball 211 is suspended to the second target height by the adjustment screw 83, thereby achieving precise control of the installation height of the upper chord bolt ball 211.

[0097] Based on the position of the installed upper chord bolt ball 211, install the upper chord 212, web member 213, and lower chord 214 of the mesh unit 210 of the space frame 200. Install the prism 110 on other existing bolt holes of the upper chord bolt ball 211 or lower chord bolt ball 215 of the mesh unit 210. Use a total station in conjunction with the prism 110 to check the installation error of the mesh unit 210. If the error is within the allowable range, proceed with the above steps to install the next mesh unit 210. If the error exceeds the allowable range, continue to adjust the height of the upper chord bolt ball 211 using the positioning adjustment component 80 until the error is within the allowable range.

[0098] When the length of the positioning guide 60 is insufficient to install a complete mesh unit 210, the positioning guide 60 is extended along the length direction of the mesh unit 210 using the guide beam 61. After the positioning guide 60 is extended, a new cantilever end is formed, and the traction rope 513 is reconnected to the new cantilever end. At the same time, it is ensured that each guide beam 61 is connected to a cable 70. When the two newly added guide beams 61 are parallel, a horizontal cross brace is connected between the two parallel guide beams 61.

[0099] Repeat the above steps until the space frame 200 is fully assembled.

[0100] like Figure 16 , Figure 17 As shown, firstly, two device units 100 are installed on the inner side of the side wall 300 along the length of the side wall 300, and the positioning guide 60 connects the two device units 100. Then, the mesh unit 210 below the rigid platform 20 of each device unit 100 is installed, and other mesh units 210 are installed outwards until both device units 100 are completely filled with mesh units 210, as shown. Figure 18 As shown.

[0101] like Figure 19 , Figure 20 As shown, continue in Figure 17 Two additional new device units 100 are installed on the side of the two original device units 100 away from the side wall 300, and the new device units 100 are connected to the original device units 100. The mesh units 210 are continued to be laid until both new device units 100 are completely filled with mesh units 210, as shown. Figure 21 , Figure 22As shown, after two new device units 100 are filled with mesh units 210, two more new device units 100 are added and mesh units 210 are installed along the direction away from the side wall 300, which can also be called the advancing direction of the space frame 200 installation. After the new device units 100 are filled with mesh units 210, new device units 100 can also be added by rotation along the length of the side wall 300, as shown. Figure 23 As shown. Obviously, the present invention has great flexibility in installing the space frame 200, is not affected by the existing ground structure, and can greatly improve the installation efficiency and accuracy of the space frame 200.

[0102] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A device for installing a space frame above an existing structure, characterized in that, It includes one or more device units; each device unit includes a first lattice column, a rigid platform, a second lattice column, a power platform, an adjustable semi-rigid positioning guide assembly, and a traction system; The first lattice column is erected vertically, and the rigid platform is connected to the first lattice column; the second lattice column is installed on the rigid platform, and the power platform is installed on the second lattice column; The adjustable semi-rigid positioning guide assembly includes multiple positioning guides distributed around the rigid platform. One end of each positioning guide is hinged to the rigid platform, and the other end is a cantilever end. The cantilever end of the positioning guide is connected to the traction rope of the traction system. The traction system adjusts the tension of the traction rope to adjust the height of the positioning guide. Multiple positioning adjustment elements are spaced apart along the length of the positioning guide. The positioning adjustment elements are used to suspend the connecting space frame and adjust the height of the space frame.

2. The device for installing a space frame above an existing structure according to claim 1, characterized in that, The positioning guide includes a plurality of guide beams that are hinged sequentially along its length; the positioning adjustment component is provided on the guide beams; the adjustable semi-rigid positioning guide assembly also includes a cable, one end of which is connected to the guide beam and the other end of which is connected to the second lattice column.

3. The device for installing a space frame above an existing structure according to claim 1, characterized in that, The adjustable semi-rigid positioning guide assembly also includes a horizontal support beam, which connects the two positioning guides.

4. The device for installing a space frame above an existing structure according to claim 1, characterized in that, The device unit also includes a total station and multiple prisms distributed on the installed space frame. The total station and the prisms are used in conjunction to detect the installation error of the space frame.

5. The device for installing a space frame above an existing structure according to claim 1, characterized in that, The traction system includes multiple traction components distributed around the power platform; each traction component includes a truss support and a traction device, one end of the truss support is rotatably engaged with the power platform, and the other end is connected to the traction device; the traction device includes a traction drive and a traction rope; the traction drive is used to adjust the tension of the traction rope, and the traction rope is connected to the cantilever end of the positioning guide.

6. The device for installing a space frame above an existing structure according to claim 5, characterized in that, The traction system also includes adjustable tie-up flexible steel cables; the adjustable tie-up flexible steel cables are connected end to end to tie up all truss support members in sequence to constrain their rotation angle.

7. The device for installing a space frame above an existing structure according to claim 5, characterized in that, The power platform includes a steel platform and a control cabinet; the steel platform is located at the top of the second lattice column, the control cabinet is located on the steel platform, and the control cabinet is electrically connected to the traction drive component.

8. The device for installing a space frame above an existing structure according to claim 1, characterized in that, The device unit also includes one or more balance beams connected to the positioning guide.

9. The device for installing a space frame above an existing structure according to claim 1, characterized in that, Multiple device units are arranged in an array; the cantilevered ends of one or two positioning guides of adjacent device units are connected.

10. A construction method for installing a space frame above an existing structure using the device as described in claim 1, characterized in that, Includes the following steps: Based on the structure of the space frame to be installed, a finite element analysis of the installation process is performed to determine the size and positioning of the device units used to install the space frame. Based on the determined dimensions and positioning, assemble the device unit, and use the traction system of the device unit to adjust the height of the positioning guide to the first target height; The upper chord bolt balls of the space frame are connected to the various positioning adjustment components on the positioning guide, and the upper chord bolt balls are adjusted to the second target height through the positioning adjustment components; Based on the positions of the installed upper chord bolt balls, install the upper chord, web members, and lower chord of the space frame until the space frame is fully assembled.

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