A method for installing lobby trusses

Abstract

The present invention discloses a method for installing a lobby truss, comprising the following steps: step S100, installing a truss sliding support; step S200, installing a lobby roof truss; step S300, installing a bottom inverted triangular arc truss; step S400, installing a longitudinal dome truss and its transverse connecting truss; step S500, unloading a sliding support; and step S600, unloading a temporary support. The technical effect achieved is as follows: before the structure is installed, the present invention calculates the force changes of the structure in each construction step during the construction phase, and obtains the approximate slip amount and deformation amount of the structure after unloading the sliding support, and reasonably arranges the sequence of pre-arching of the structure, pre-recovery of the support, and unloading of the structure according to the calculation results, so that after the structure is unloaded, the slip amounts reserved on both sides of the final sliding direction of the sliding support are basically the same, and the final position of the structure after unloading is closer to the design theoretical value; thus, the installation accuracy of the structure is improved, which is not only more conducive to the stability of the structure but also more conducive to the construction of the next step.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a method for installing a truss in a lobby. Background Art

[0002] At present, in the installation of similar prelude structures, the existing method usually only performs a simple temporary fixation of the sliding support and unloads the structure after the installation is completed; the sliding support will slide according to the force direction of the structure, resulting in different sliding amounts on both sides of the sliding support under normal structural conditions; under extreme conditions and cumulative errors, the sliding amount of the sliding support will be insufficient, causing a series of structural force problems; and after the structure is unloaded, the entire structure will deform and deflect after unloading, affecting the final accuracy of the structure. Summary of the Invention

[0003] To this end, the present invention provides a lobby truss installation method to solve the above-mentioned problems in the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] According to a first aspect of the present invention, a method for installing a lobby truss comprises the following steps:

[0006] Step S100: installing the truss sliding support;

[0007] Step S200: installing the roof trusses of the lobby;

[0008] Step S300: Install the bottom inverted triangle arc truss;

[0009] Step S400: installing the longitudinal dome trusses and their transverse connecting trusses;

[0010] Step S500: Unloading the sliding support;

[0011] Step S600: temporary support unloading.

[0012] Furthermore, step S100 includes:

[0013] Step S110: The lobby structure is installed on the top of the frame structure columns and the steel frame beams through six anti-seismic ball joint supports and eight sliding supports. In addition to bearing weight, the sliding supports also have the function of limiting displacement, controlling shaking and reducing thrust.

[0014] Step S120: Reserving a slip amount in the direction where the structure is most deformed due to temperature load to reduce the thrust of the roof structure deformation on the bottom frame structure;

[0015] Step S130: Before installing the sliding support, the support needs to be temporarily fixed to temporarily restrict its sliding;

[0016] Step S140: The sliding supports installed below the bottom triangular ring truss are pre-recovered and temporarily fixed according to the structural stress characteristics based on the simulation calculation of the construction phase of the structure.

[0017] Furthermore, step S200 includes:

[0018] Step S201: measure and lay out the lines, install the truss support of the lobby roof, and use a truck crane to install it;

[0019] Step S202: Use a tower crane to install the X6-axis truss segment of the prologue hall. Use a guy rope to temporarily fix it during the installation process. Use the second mobile crane to install the secondary truss, and the first mobile crane to install the triangular truss segment.

[0020] Step S203: patch the middle truss of the X6 axis, install the secondary truss to stabilize it, and install the adjacent segments of the triangular truss at the same time;

[0021] Step S204: Use a tower crane to suspend the outer cantilever of the X6-axis roof truss, and use a second mobile crane to install the connecting rods between the cantilevers, and at the same time install the third section of the triangular truss;

[0022] Step S205: Use the 5# and 8# tower cranes to install the roof truss segments in the X1 axis frame area of ​​the prologue hall and connect the secondary trusses. Use the mobile crane to install the fourth section of the triangular truss.

[0023] Step S206: After the triangular truss is installed, a truck crane is used to install the X1 axis hall area truss segment, and a tower crane is used to install the secondary truss.

[0024] Step S207: The first mobile crane inserts the middle section of the X1-axis truss, and the two tower cranes respectively install the cantilevers on both sides. The second mobile crane cooperates to install the connecting rod and the secondary truss.

[0025] Step S208: The mobile crane installs two sets of dome trusses in the middle area, and temporarily fixes them with guy ropes during the installation process;

[0026] Step S209: Connect the connecting trusses and horizontal supports between the two dome trusses;

[0027] Step S210: Install the dome trusses of the lobby from the middle to both sides, and connect the secondary trusses in time after each truss is installed;

[0028] Step S211: Install the dome trusses, connecting trusses, horizontal supports and other components in sequence;

[0029] Step S212: Install the frame structures on both sides of the lobby and remove the truss supports on the lobby roof. During the removal and unloading process, monitor the stress and deformation simultaneously.

[0030] In a specific embodiment, the first truck crane is a 260t truck crane.

[0031] In a specific embodiment, the second truck crane is a 25t truck crane.

[0032] Furthermore, step S300 includes:

[0033] Step S310: The triangular ring truss at the bottom of the lobby is constructed by assembling the trusses in sections on the ground and placing the whole trusses in place;

[0034] Step S320: The ground assembly is divided into 7 sections, and the high-altitude hoisting is arranged in 5 sections. It is necessary to set supports on the steel beams and concrete floor slabs, with 4 groups set on the steel beams and 2 groups set on the concrete beams. The supports are placed under the upper chord rods cantilevered from the triangular ring trusses to ensure the stability of the structure during installation.

[0035] Furthermore, step S400 includes: directly using an on-site tower crane to install the longitudinal trusses of the foyer dome in the order of longitudinal main trusses and transverse connecting trusses.

[0036] Furthermore, step S600 includes:

[0037] Step S610: The lobby structure is unloaded from the inside to the outside. First, all temporary fixings are removed. After the removal is completed, the temporary supports at the two roof truss segments are unloaded.

[0038] Step S620: then unload the temporary support of the cantilevered upper chord of the bottom triangular truss;

[0039] Step S630: During the unloading process, the temporary support monitors the deformation of the structure at any time and compares it with the calculation during the construction phase. After the unloading is completed, the sliding amount reserved on both sides of the sliding support is observed, and the pre-recovered support slides to the middle position through unloading.

[0040] The present invention has the following advantages: before the structure is installed, the present invention calculates the stress changes of the structure in each construction step during the construction phase, and obtains the approximate slip amount of the sliding support and the deformation of the structure after unloading, and reasonably arranges the structure pre-arching, support pre-recovery and unloading sequence according to the calculation results, so that after the structure is unloaded, the slip amounts reserved on both sides of the final sliding direction of the sliding support are basically the same, and the final position of the structure after unloading is closer to the design theoretical value; the installation accuracy of the structure is improved, which is not only more conducive to the stability of the structure but also more conducive to the construction of the next step. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flowchart of a lobby truss installation method provided for some embodiments of the present invention.

[0042] Figure 2 A support arrangement diagram of a lobby truss installation method provided for some embodiments of the present invention.

[0043] Figure 3 A schematic diagram of a type of seismic hinge support for a lobby truss installation method provided in some embodiments of the present invention.

[0044] Figure 4 Schematic diagram of type 2 seismic hinge support for a lobby truss installation method provided in some embodiments of the present invention.

[0045] Figure 5 An X-axis schematic diagram of a sliding support for a lobby truss installation method provided in some embodiments of the present invention.

[0046] Figure 6 A Y-axis schematic diagram of a sliding support for a lobby truss installation method provided in some embodiments of the present invention.

[0047] Figure 7 A schematic diagram of X-axis sliding support reinforcement for a lobby truss installation method provided in some embodiments of the present invention.

[0048] Figure 8 A schematic diagram of Y-axis sliding support reinforcement for a lobby truss installation method provided in some embodiments of the present invention.

[0049] Figure 9 A schematic top view of a sliding support reinforcement for a lobby truss installation method provided in some embodiments of the present invention.

[0050] Figure 10 A schematic diagram of a segmented truss structure of a lobby dome roof provided in accordance with a lobby truss installation method according to some embodiments of the present invention.

[0051] Figure 11 A schematic diagram of a section of a foyer dome truss according to a foyer truss installation method provided in some embodiments of the present invention.

[0052] Figure 12 A schematic diagram of the segmented assembly of the lobby triangular ring trusses in a lobby truss installation method provided in some embodiments of the present invention.

[0053] Figure 13 A schematic diagram of the overall sequence of installing the foyer segmented steel structure according to a foyer truss installation method provided in some embodiments of the present invention.

[0054] Figure 14 A flowchart of a lobby installation method for a lobby truss installation provided in some embodiments of the present invention.

[0055] Figure 15The present invention provides a method for installing a foyer truss, which is a flowchart of the overall installation of the foyer roof steel structure, in the first step.

[0056] Figure 16 This is a flowchart of the overall installation of the lobby roof steel structure, the second step of a lobby truss installation method provided in some embodiments of the present invention.

[0057] Figure 17 The present invention provides a flowchart of the overall installation of the lobby roof steel structure in the third step of a lobby truss installation method according to some embodiments of the present invention.

[0058] Figure 18 The fourth step of a method for installing a foyer truss is provided in some embodiments of the present invention, which is a flowchart of the overall installation of the foyer roof steel structure.

[0059] Figure 19 The fifth step of a method for installing a foyer truss is provided in some embodiments of the present invention, which is a flowchart of the overall installation of the foyer roof steel structure.

[0060] Figure 20 The sixth step of a method for installing a foyer truss is provided in some embodiments of the present invention, which is a flowchart of the overall installation of the foyer roof steel structure.

[0061] Figure 21 The seventh step of a method for installing a foyer truss is provided in some embodiments of the present invention, which is a flowchart of the overall installation of the foyer roof steel structure.

[0062] Figure 22 The eighth step of a method for installing a foyer truss is provided in some embodiments of the present invention, which is a flowchart of the overall specific installation of the foyer roof steel structure.

[0063] Figure 23 The ninth step of a method for installing a foyer truss is provided in some embodiments of the present invention, which is a flowchart of the overall specific installation of the foyer roof steel structure.

[0064] Figure 24 The present invention provides a flowchart of the overall installation of the lobby roof steel structure in the tenth step of a lobby truss installation method according to some embodiments of the present invention.

[0065] Figure 25 The present invention provides a flowchart of the overall specific installation of the lobby roof steel structure in the eleventh step of a lobby truss installation method provided in some embodiments of the present invention.

[0066] Figure 26 The present invention provides a flowchart of the overall installation of the lobby roof steel structure in the twelfth step of a lobby truss installation method according to some embodiments of the present invention.

[0067] Figure 27A schematic diagram of the axle side of a triangular truss assembly cradle for a lobby truss installation method provided in some embodiments of the present invention.

[0068] Figure 28 A segmented diagram of a triangular ring truss installation method for a lobby truss provided in some embodiments of the present invention.

[0069] Figure 29 Schematic diagram of triangular ring truss installation support for a lobby truss installation method provided in some embodiments of the present invention.

[0070] Figure 30 A schematic diagram of support specifications for a lobby truss installation method provided in some embodiments of the present invention.

[0071] Figure 31 A schematic diagram of a 1500×1500 standard section (outer diameter) structure for a lobby truss installation method provided for some embodiments of the present invention (the relative elevations of the D-1 and D-2 axis trusses are different).

[0072] Figure 32 A schematic diagram of a 1500×1500 (outer diameter) standard section (8t low, 9t high) for a lobby truss installation method provided for some embodiments of the present invention.

[0073] Figure 33 A schematic diagram of the steel column top support arrangement for a lobby truss installation method provided in some embodiments of the present invention.

[0074] Figure 34 A side elevation view of the steel column top support of a lobby truss installation method provided in some embodiments of the present invention.

[0075] Figure 35 Schematic diagram of the lower structure of steel columns supporting a lobby truss installation method provided in some embodiments of the present invention (steel plate thickness 20mm).

[0076] Figure 36 A diagram of the locations of the structural pre-arching nodes of a lobby truss installation method provided in some embodiments of the present invention.

[0077] In the figure: 1. Sliding bearing, 2. Seismic hinge bearing type 1, 3. Seismic hinge bearing type 2, 4. Standard section support, 5. Concrete structure. DETAILED DESCRIPTION

[0078] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0079] like Figure 1 As shown, the installation sequence of the lobby structure is: installation of truss sliding supports → installation of lobby roof trusses → installation of bottom inverted triangle arc trusses → installation of longitudinal dome trusses and their transverse connecting trusses → unloading of sliding supports → unloading of temporary supports

[0080] 1. Installation of sliding bearings 1: The preface hall structure is installed on the top of the frame structure column and the steel frame beam through 6 earthquake-resistant ball joint bearings and 8 sliding bearings 1. In addition to bearing weight, the sliding bearing 1 also has the function of limiting displacement, controlling shaking and reducing thrust. By reserving sliding amount in the direction where the structure deforms most due to temperature load, the thrust of the roof structure deformation on the bottom frame structure is reduced. Before installing the sliding bearing 1, the bearing needs to be temporarily fixed to temporarily limit its sliding. For the sliding bearing 1 installed under the bottom triangular ring truss, according to the simulation calculation of the structure during the construction phase and the stress characteristics of the structure, it is pre-recovered and temporarily fixed.

[0081] 2. Installation of the Preface Hall Dome Roof Trusses: The trusses were constructed using a method of segmented assembly on the ground and in-situ installation at high altitude. Installation was performed using an on-site tower crane and a 260t truck crane. Since the maximum temporary support height reached 29.37m, to ensure overall stability and conserve support materials, the high supports were constructed using 1500×1500 (OD) standard sections. The 1500×1500 standard sections had risers measuring Φ180×8, and branch pipes measuring Φ102×6. The standard sections were 6m and 3m in length, connected by flanges and screws. Transfer platforms, constructed of H400×400×13×21 steel, were installed at the top and bottom of the supports. These platforms primarily served to receive and transfer forces from the supports to the concrete beams and columns. Connecting trusses were installed between the four sets of supports, forming a stable structure.

[0082] 3. Installation of the triangular ring truss in the foyer: The triangular ring truss at the bottom of the foyer is assembled in sections on the ground and placed in sections as a whole. The ground assembly is divided into 7 sections, and the high-altitude hoisting is arranged in 5 sections. It is necessary to set supports on the steel beams and concrete floor slabs. There are 4 groups on the steel beams (about 3.1m in height) and 2 groups on the concrete beams (about 12m in height). The supports are placed under the upper chord of the triangular ring truss to ensure the stability of the structure during installation.

[0083] 4. Installation of the foyer dome trusses: The longitudinal trusses of the foyer dome are directly installed using an on-site tower crane in the order of longitudinal main trusses → transverse connecting trusses.

[0084] 5. Unloading of the preface hall structure: The preface hall structure is unloaded in the order from the inside to the outside. First, all temporary fixing measures of the supports are removed. After the removal is completed, the temporary supports at the segmented positions of the two roof trusses are unloaded first; then the temporary supports of the cantilevered upper chord of the bottom triangular truss are unloaded; during the unloading process, the temporary supports monitor the deformation of the structure at any time and compare it with the verification calculations in the construction stage. Finally, after the unloading is completed, the sliding amount reserved on both sides of the sliding support 1 is observed, and the pre-recovered supports slide to the middle position through unloading.

[0085] The preface hall structure was assembled in three main sections: the preface hall roof trusses, the base triangular ring trusses, and the dome. Construction was primarily carried out on-site using a method of segmented assembly, temporary support, and segmented hoisting. Based on site conditions, two tower cranes were used in conjunction with a 260-ton truck crane for the lifting.

[0086] 1. Installation of the structural supports of the lobby;

[0087] The two main trusses of the foyer roof truss and the top of the frame column are connected by 6 seismic spherical hinge supports (seismic hinge support type 1 2 and seismic hinge support type 2 3). The seismic spherical hinge supports are divided into two specifications; the triangular ring truss at the top of the foyer is connected to the top of the frame column and the top surface of the frame beam through 8 sliding supports 1.

[0088]

[0089] like Figures 2 to 9 As shown, the support installation requirements are:

[0090] (1) Check the flatness of the steel structure surface at the bottom of the support and clean the rust on the steel plate.

[0091] (2) Check whether the support is intact. The temporary connection device must not be disassembled during the installation process (except for adjusting the pre-deflection of the sliding support 1). Clean the paint on the welding surface to expose the fresh welding surface.

[0092] (3) Draw a cross center line on the embedded plate under the support installation location and draw a cross center line on the lower part of the support.

[0093] (4) The support is in place, and the cross center line of the lower part of the support coincides with the cross center line of the lower embedded plate. Check the elevation of the top surface of the support, and the elevation deviation of the four corners of the support shall not exceed 2mm.

[0094] (5) The support is welded in batches. After one welding, the next welding is carried out after the welding part cools down until the welding is completed. The welding grade of the weld is level 1, and the weld structure meets the requirements of the design drawings.

[0095] (6) Install the support superstructure and weld it. The welding method is the same as step 6.

[0096] (7) After the upper and lower parts are completely welded, remove the temporary connection device.

[0097] (8) During and after the installation of the support, it must be wrapped with fireproof cloth to prevent it from being exposed to rain and water.

[0098] (9) For seismic hinge supports, the top of the support needs to be reinforced and fixed after installation;

[0099] (10) The sliding support 1 is adjusted according to the pre-deflection, the temporary connection device is removed, and the pre-deflection is adjusted according to the design requirements. After the design requirements are met, the deviation of the four corners of the support is adjusted. The deviation of the four corners shall not exceed 2mm, and the temporary connection device is reconnected.

[0100] like Figure 10 As shown, the steel trusses of the foyer dome are divided into sections and assembled: Based on the weight analysis of the tower crane, 260t truck crane and 150t crawler crane, the installation of the foyer dome roof trusses is divided into 7 sections.

[0101] like Figure 11 As shown, the dome trusses of the foyer are assembled in the processing plant. The sections are mainly divided into two sections considering the transportation conditions. After entering the site, the sections will be assembled and welded using a cradle and then hoisted in sequence.

[0102] like Figure 12 As shown, the lower triangular ring truss of the dome truss is divided into 7 sections to take into account transportation and the lifting weight of a 260t truck crane and a 150t crawler crane. The upper chord of the triangular ring truss and the webs between the upper chords are assembled and welded in the processing plant. After entering the site, the triangular ring truss is assembled using a tire frame.

[0103] like Figure 13 and Figure 14 As shown, the preface hall roof steel structure is installed: the west side of the preface hall steel structure is connected to the site road and the east side is connected to the frame area roof steel structure. It mainly includes two preface hall roof dome trusses, triangular trusses on the frame area steel beams, and 11 dome trusses between the roof preface hall trusses and triangular trusses. This area can be used for 5# and 8# tower cranes. According to its structural form, the roof trusses and triangular trusses are installed first. During the installation process, secondary trusses are embedded to ensure stability. Finally, the 11 dome trusses are installed. In addition to the two tower cranes, the installation requires the cooperation of a 260t truck crane, a 150t crawler crane, and a 25t truck crane.

[0104] like Figures 15 to 26As shown, the specific installation process corresponding to each figure is:

[0105] Step S201 (the first step): measuring and setting out, installing the lobby roof truss support, and using a 260t truck crane for installation;

[0106] Step S202 (second step): Use a tower crane to install the X6 axis truss segment in the prologue hall. Use cables to temporarily fix it during the installation process. Use a 25t truck crane to install the secondary truss. Use a 260t truck crane to install the triangular truss segment.

[0107] Step S203 (third step): patch the X6-axis intermediate truss, install the secondary truss to stabilize it, and install the adjacent segments of the triangular truss at the same time;

[0108] Step S204 (the fourth step): Use a tower crane to suspend the outer cantilever of the X6-axis roof truss, and use a 25t truck crane to install the connecting rods between the cantilevers, and at the same time install the third section of the triangular truss;

[0109] Step S205 (fifth step): Use 5# and 8# tower cranes to install the roof truss segments in the X1 axis frame area of ​​the lobby and connect the secondary trusses. Use a 260t truck crane to install the fourth section of the triangular truss.

[0110] Step S206 (step 6): After the triangular truss is installed, a 260t truck crane is used to install the X1 axis hall area truss segment, and a tower crane is used to install the secondary truss;

[0111] Step S207 (step 7): The 260t truck crane is used to install the middle section of the X1 axis truss. The two tower cranes are used to install the cantilevers on both sides. The 25t truck crane is used to install the connecting rods and the secondary trusses.

[0112] Step S208 (eighth step): The 260t truck crane installs two sets of dome trusses in the middle area, and temporarily fixes them with guy ropes during the installation process;

[0113] Step S209 (9th step): connecting the connecting trusses and the horizontal supports between the two dome trusses;

[0114] Step S210 (step 10): Install the dome trusses of the lobby from the middle to both sides, and connect the secondary trusses in time after each truss is installed;

[0115] Step S211 (step 11): install the dome trusses, connecting trusses, horizontal supports and other components in sequence;

[0116] Step S212 (the twelfth step): install the frame structure on both sides of the lobby and remove the lobby roof truss support. During the removal and unloading process, monitor its stress and deformation simultaneously.

[0117] (1) Assembly of triangular trusses

[0118] like Figure 27 As shown, the triangular truss assembly uses 8 roadbed boxes as the foundation, H300×300 steel columns are set on the roadbed boxes, and corbels are set on the columns, which also use H300×300 steel. Diagonal braces are added between the corbels and the columns, and the diagonal braces use Φ89×4 round tubes.

[0119] (2) Triangular ring truss support setting

[0120] like Figures 28 to 30 As shown, the triangular ring truss of the foyer is divided into 7 sections for ground assembly, and is hoisted into 5 sections for installation at high altitude. It is necessary to set supports on the steel beams and concrete floor slabs, with 4 groups on the steel beams (about 3.1m in height) and 2 groups on the concrete beams (about 12m in height).

[0121] (3) Installation and support arrangement of the dome truss of the lobby roof

[0122] like Figure 31 and Figure 32 As shown, the dome roof trusses for the foyer were installed in situ in sections at high altitude using a tower crane, a 260t truck crane, and a 150t crawler crane. This required a high support between the basement ceiling and the trusses. The high support consisted of four standard section supports measuring 1500×1500 (outer diameter, center spacing 1300×1300). The 1500×1500 standard section risers were Φ180×8, and the branch pipes were Φ102×6. The standard sections were 6m and 3m long, and flanges were used to connect the sections. Transfer platforms, constructed of H400×400×13×21 steel, were installed at the top and bottom of the supports. These platforms primarily served to receive the forces exerted on the support frame and to transfer these forces to the concrete beams and columns of the concrete structure 5.

[0123] like Figures 33 to 35 As shown, the weight of a 26m standard section at an elevation of approximately 10.5t, and the weight of a 30m standard section is approximately 11t. Each set of standard sections is installed in two stages using a tower crane. The original plan for the 2nd / JF and 2nd / AD axis roof trusses in the foyer area was to use a tower crane for direct installation. However, after the change, this did not meet the tower crane's lifting requirements, and it was necessary to add supports to the DH and DB axis steel columns for segmented installation. The main support tubes used were Φ325×12, and two diagonal braces were added to the steel beam locations on both sides. The diagonal braces used Φ245×12 round tubes. No stiffening plates were installed below the sealing plate at the original steel column location, so it was necessary to add cross stiffening ribs and peripheral plates to the top of the steel columns before installing supports. The peripheral plates of the supports were beveled and welded to the steel columns, the cross ribs to the plates, and the support tubes to the lower node plates.

[0124] (4) Pre-recovery of supports and pre-arching of structures

[0125] like Figure 36As shown in the figure, the stress changes of the structure in each construction step during the construction phase are calculated before the structure is installed, and the approximate slip amount of the sliding support 1 and the deformation of the structure after unloading are obtained. The sequence of structural pre-arching, support pre-recovery and unloading is reasonably arranged according to the calculation results.

[0126] (5) Changes in structural stress during construction

[0127] The lobby structure is mainly divided into three parts: the lobby roof truss part, which is a large-span plane truss; the bottom triangular ring truss, which is an inverted triangular ring truss, and the lower chord is installed on the sliding support 1 at the top of the frame structure; the dome part is a plane truss connecting the roof truss and the triangular ring truss.

[0128] The maximum span of the dome roof truss reaches 84 meters. Before the structure is formed into a whole, due to its large span, it will cause downward disturbance deformation in the middle part of the truss. Therefore, it is necessary to set up temporary supports before installation to shorten the load-bearing span of the truss and control the overall deformation of the roof truss.

[0129] The bottom triangular ring truss is inverted and unstable before forming a whole. Therefore, temporary support is provided for its cantilevered upper chord to ensure stability during installation.

[0130] During the installation of the dome truss, the dome roof truss and the inverted triangular truss at the bottom are the main load-bearing trusses, and the dome truss only bears its own gravity.

[0131] After the entire structure is installed, the temporary support of the structure is unloaded. At this time, the dome truss begins to play a supporting role, forming the foyer roof truss and the bottom inverted triangular ring truss into a whole; that is, it supports the middle position of the large-span foyer roof truss and offsets the force of the upper chord part of the inverted triangular ring truss, forming a stable whole.

[0132] In the above embodiment, the conventional method of taking the arch value according to the span of the load-bearing structure is not adopted. Instead, the structure is pre-arched based on simulation verification to ensure that after the final installation is completed and unloading, the spatial position of the structure is more accurately close to the design theoretical value; the support is pre-recovered according to the calculated structure to ensure that under normal conditions after unloading, the sliding amount on both sides of the sliding support is as close to the design value as possible, avoiding the loss of the sliding amount of the sliding support due to the change of the stress state during the construction process; according to the verification during the construction stage, temporary supports are reasonably set up to avoid waste as much as possible while ensuring safety.

[0133] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0134] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0135] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0136] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0137] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0138] In the description of this specification, the reference terms "Embodiment 1", "Embodiment 2", "Example", "Specific Example", or "Some Examples" mean that the specific method, device or feature described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, methods, devices or features described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0139] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for installing a lobby truss, characterized in that: The following steps are involved: Step S100: installing the truss sliding support; Step S200: installing the roof trusses of the lobby; Step S300: Install the bottom inverted triangle arc truss; Step S400: installing the longitudinal dome trusses and their transverse connecting trusses; Step S500: Unloading the sliding support; Step S600: temporary support unloading; Wherein, step S100 includes: Step S110: The lobby structure is installed on the column tops and steel frame beams of the frame structure through m earthquake-resistant spherical hinge supports and n sliding supports; Step S120, reserving a slip amount in the direction where the structure is most deformed due to temperature load; Step S130: Before installing the sliding support, the support needs to be temporarily fixed to temporarily restrict its sliding; Step S140: For the sliding supports installed below the bottom triangular ring truss, perform pre-recovery and temporary fixation based on the structural stress characteristics according to the simulation calculation of the construction stage of the structure; Among them, when installing the sliding support, adjust the sliding support according to the pre-bias, remove the temporary connection device, adjust the pre-bias according to the design requirements, and after meeting the design requirements, adjust the deviation of the four corners of the support. The deviation of the four corners shall not exceed 2mm, and reconnect the temporary connection device.

2. A method for installing a lobby truss according to claim 1, characterized in that: m=6, n=8.

3. The method for installing a lobby truss according to claim 1, wherein: Step S200 includes: Step S201: measure and lay out the lines, install the truss support of the lobby roof, and use a truck crane to install it; Step S202: Use a tower crane to install the lobby truss segments, using cables for temporary fixation during the installation process. Use the second mobile crane to install the secondary truss, and the first mobile crane to install the triangular truss segments. Step S203: patch the middle truss and install the secondary truss to stabilize it, and install adjacent segments of the triangular truss at the same time; Step S204: Use a tower crane to suspend the outer cantilever of the roof truss, and use a second mobile crane to install the connecting rods between the cantilevers, and at the same time install the third section of the triangular truss; Step S205: Use a tower crane to install the roof truss segments in the lobby frame area and connect the secondary trusses. Use a truck crane to install the fourth triangular truss. Step S206: After the triangular truss is installed, a truck crane is used to install the hall area truss segments, and a tower crane is used to install the secondary trusses. Step S207: The first mobile crane inserts the middle section of the truss, the two tower cranes install the cantilevers on both sides respectively, and the second mobile crane cooperates to install the connecting rods and secondary trusses; Step S208: The mobile crane installs two sets of dome trusses in the middle area, and temporarily fixes them with guy ropes during the installation process; Step S209: Connect the connecting trusses and horizontal supports between the two dome trusses; Step S210: Install the dome trusses of the lobby from the middle to both sides, and connect the secondary trusses in time after each truss is installed; Step S211: Install the dome trusses, connecting trusses, horizontal supports and other components in sequence; Step S212: Install the frame structures on both sides of the lobby and remove the truss supports on the lobby roof. During the removal and unloading process, monitor the stress and deformation simultaneously.

4. The method for installing a lobby truss according to claim 3, wherein: The first truck crane is a 260t truck crane.

5. The method for installing a lobby truss according to claim 3, wherein: The second truck crane is a 25t truck crane.

6. The method for installing a lobby truss according to claim 1, characterized in that: Step S300 includes: Step S310: The triangular ring truss at the bottom of the lobby is constructed by assembling the trusses in sections on the ground and placing the whole trusses in place; Step S320: The ground assembly is divided into several sections. The high-altitude hoisting is arranged in place according to the section arrangement. It is necessary to set supports on the steel beams and concrete floor slabs, and the supports are under the upper chord rods cantilevered from the triangular ring trusses.

7. The method for installing a lobby truss according to claim 1, wherein: Step S400 includes: directly using an on-site tower crane to install the longitudinal trusses of the foyer dome in the order of longitudinal main trusses and transverse connecting trusses.

8. The method for installing a lobby truss according to claim 1, characterized in that: Step S600 includes: Step S610: The lobby structure is unloaded from the inside to the outside. First, all temporary fixings are removed. After the removal is completed, the temporary supports at the two roof truss segments are unloaded. Step S620: then unload the temporary support of the cantilevered upper chord of the bottom triangular truss; Step S630: During the unloading process, the temporary support monitors the deformation of the structure at any time and compares it with the calculation during the construction phase. After the unloading is completed, the sliding amount reserved on both sides of the sliding support is observed, and the pre-recovered support slides to the middle position through unloading.

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