A construction method for installing the keel of the skylight on the inner roof of a long-span structure

Abstract

The present invention discloses a construction method for installing the skylight keel on the inner roof of a long-span structure, which includes the following steps: Step S100, installing the assembly jig; Step S200, installing the upper purlins of the roof structure and positioning the lower purlins inside the jig; Step S300, installing the upper and lower through-long cross beams and the small assembled units on the skylight elevation; Step S400, connecting and installing the primary and secondary structural beams of the skylight; Step S500, arranging the lifting system; Step S600, overall lifting; Step S700, installing the patch members. According to the structural characteristics of the arc truss inner courtyard and the connecting truss area between the outer arc truss and the floor-standing large arch, the skylight of the arc truss inner courtyard is segmented according to the main truss, and the outer connecting truss area is segmented according to the secondary truss. The segmented small assembled units are assembled and welded on the ground using the jig, and the overall lifting is achieved by repeatedly changing the force direction with the help of an electric winch and a fixed pulley.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a construction method for installing the skylight keel on the inner roof of a long-span structure. Background Art

[0002] Eight groups of daylighting skylights are provided in the connection truss area between the arc truss inner courtyard, the outer arc truss and the floor-standing large arch in the east entrance hall. The structural height is between 24.864 and 37.889 m. The number of skylight keel components is 11,892, and the number of fixed skylight keel purlins is 400. The number of components is large. The shapes of the eight groups of skylights are all arc-shaped curved surface structures, and the installation control is difficult. The high-altitude bulk installation by the traditional method is difficult, the number of machines used is large, a large number of 50t truck cranes and high-altitude operation platforms are required, and the construction safety risk is relatively high.

[0003] The defects of the prior art are as follows:

[0004] 1. Using an aerial work vehicle in cooperation with a truck crane for high-altitude bulk installation has a slow installation speed, high safety risk, and great difficulty in quality control.

[0005] 2. Using a large-scale high-altitude integral lifting platform in cooperation with a truck crane for installation has a high construction machinery cost and low construction efficiency. Summary of the Invention

[0006] Therefore, the present invention provides a construction method for installing the skylight keel on the inner roof of a long-span structure to solve the above problems in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] According to the first aspect of the present invention, a construction method for installing the skylight keel on the inner roof of a long-span structure includes the following steps:

[0009] Step S100: Install the assembly jig.

[0010] Step S200: Install the upper purlins of the roof structure and position them inside the lower purlin jig.

[0011] Step S300: Install the upper and lower through-long cross beams and the small assembled units on the skylight elevation.

[0012] Step S400: Connect and install the primary and secondary structural beams of the skylight.

[0013] Step S500: Arrange the lifting system.

[0014] Step S600: Integrally lift.

[0015] Step S700: Install the patch members.

[0016] Further, in step S100, the assembled jig is an overall assembled jig for purlins and skylight keel structures below the lower chord of the roof. The assembled jig includes:

[0017] In step S110, after positioning and setting out the lines, place the jig base and connect the bases with base tie beams to ensure the stability of the jig base during the assembly process. The height of the jig base is set to be convenient for the installation and welding of the lowermost components.

[0018] In step S120, install the positioning brackets for the lower chord purlins. The height of the brackets is set according to the elevation of the purlins, and their stiffness is ensured.

[0019] In step S130, install the jig diagonal braces on the jig base, mainly providing lateral support for the outside of the skylight elevation keel and ensuring the overall stability of the jig. At the same time, install a temporary ladder on the diagonal brace columns for construction personnel to go up and down.

[0020] Further, step S200 includes:

[0021] In step S210, use 3D scanning technology to monitor and adjust the installation positions of the upper chord purlins, upper continuous beams, lower chord lower purlins, and lower continuous beams on the roof to ensure their accuracy and stability. At the same time, make adjustments on the ground in advance to meet the design requirements.

[0022] In step S220, when installing the lower chord lower purlins, set baffles at the bottom according to their slope to prevent the purlins from slipping and ensure the safety and stability during the installation process.

[0023] Further, step S300 includes: controlling the spatial position of the skylight elevation keel. After adjusting its elevation perpendicularity and elevation, establish a connection between the jig diagonal brace and the elevation keel to ensure the overall stability of the small assembly unit during the ground installation and welding process.

[0024] Further, step S400 includes: before installing the main and secondary beams of the skylight, it is necessary to inspect the skylight elevation keel to ensure that its quality meets the requirements.

[0025] Further, the lifting system in step S500 consists of the structure to be lifted, the setting of lifting points, sling ropes, running ropes, electric winches and their anchor ropes, and the overall control system of the electric winches.

[0026] Further, step S500 includes:

[0027] In step S510, the lifting system needs to be calculated and simulated as a whole to meet the strength, stiffness and stability of each component within the system.

[0028] Step S520: Regarding the layout of the lifting system, it is necessary to inspect the structure to be lifted, sling ropes, running ropes, electric winches and their anchoring ropes. At the same time, commissioning should be carried out before the trial lift to ensure the stability and reliability of the system;

[0029] Step S530: The lower suspension point of the sling rope determines its hoisting position on the ordinary steel beam according to the calculation. Use a shackle to connect the sling rope and the horizontal keel at the position of the upper surface of the sling rope and the facade keel. The shackle can ensure the free passing of the sling rope. After the sling rope is stressed, it can provide lateral stability support for the facade keel;

[0030] Step S540: The sling rope passes through the fixed pulley at the upper lifting point to change the direction. To ensure that the main structure truss members and purlins do not affect the lifting of the skylight small panel unit, a set of fixed pulleys is added at the position of the lower chord of the inclined truss at the lifting point to restrict the direction of the steel wire rope inside the truss. Lead the steel wire rope to the position of the far-end column foot of the steel structure and change the steel wire rope to the horizontal direction by using a fixed pulley;

[0031] Step S550: Fix the electric winch on the column foot of the ground steel column with a steel wire rope. Wind the steel wire ropes that have changed direction through the 3 sets of fixed pulleys onto the winch drum. The end running rope is held and fixed by 2 operators to prevent the steel wire rope on the drum from idling;

[0032] Step S560: The number of lifting electric winches is determined by the force condition at the lifting point and the weight of the lifted small panel unit. The overall operation is carried out through the winch control cabinet.

[0033] Furthermore, Step S600 includes:

[0034] Step S610: After the lifting system is commissioned and passes the acceptance, a trial lift is required. Under the condition that the force transmission of the skylight small panel unit lifting system is determined, the trial lift is for 1 hour. During this period, check the stable state of each part of the lifting system and the use state of small tools such as steering pulleys;

[0035] Step S620: The overall lift is carried out under the command of a special person. If any abnormality occurs to the personnel in charge of each part of the lifting system, they should report to the commander. The lift is suspended and can only continue after the abnormality is handled;

[0036] Step S630: An infrared distance measuring device is equipped below the skylight small panel unit to provide real-time feedback on the flatness of the lifted small panel unit to the command platform and make adjustments before exceeding the allowable error of the specification;

[0037] Step S640: After the overall lift is completed, it is necessary to mutually verify the deviation through 3D scanning and the total station measurement and make adjustments. After the bolts between the upper through beam and the facade keel are connected and the lower chord purlins are fixed, the overall synchronous unloading is carried out through the winch control cabinet.

[0038] Furthermore, Step S700 includes:

[0039] Step S710: Install the horizontal keel between two groups of small hoisting units and the primary and secondary beams of the skylight.

[0040] Step S720: After all installations are completed, use 3D scanning technology to review the installation deviation of the skylight keel structure. After passing the inspection, perform the side sealing plate operation.

[0041] Furthermore, in step S600, before the overall lifting, calculate the uneven lifting of two lifting points or a single lifting point to determine the impact of the lifting method on the internal force of the structure, and exclude the unfavorable lifting method.

[0042] The present invention has the following advantages: According to the structural characteristics of the arc truss inner courtyard and the connecting truss area between the outer arc truss and the floor - standing large arch, the skylight of the arc truss inner courtyard is segmented according to the main truss, and the outer connecting truss area is segmented according to the secondary truss. The segmented small - assembled units are assembled and welded on the ground using a jig, and are integrally lifted by means of an electric winch and a fixed pulley by repeatedly changing the force direction. Description of the Drawings

[0043] Figure 1 It is a flowchart of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0044] Figure 2 It is a schematic diagram of step S100 of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0045] Figure 3 It is a schematic diagram of step S200 of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0046] Figure 4 It is a schematic diagram of step S300 of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0047] Figure 5 It is a schematic diagram of step S300 of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0048] Figure 6 It is a schematic diagram of step S400 of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0049] Figure 7 It is a schematic diagram of step S500 of a construction method for installing the skylight keel on the inner roof of a large - span structure provided by some embodiments of the present invention.

[0050] Figure 8Schematic diagram of step S500 of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0051] Figure 9 Schematic diagram of step S600 of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0052] Figure 10 Schematic diagram of step S700 of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0053] Figure 11 Schematic diagram of the distribution of the cat's paw structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0054] Figure 12 Schematic cross-sectional diagram of the cat's paw structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0055] Figure 13 Schematic diagram of the classification of the cat's paw structure components of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0056] Figure 14 Schematic diagram of the #1 cat's paw structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0057] Figure 15 Schematic diagram of the #2 cat's paw structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0058] Figure 16 Schematic diagram of the #3 cat's paw structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0059] Figure 17 Schematic diagram of the #4 cat's paw structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0060] Figure 18 Component composition diagram of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0061] Figure 19 Schematic plan layout diagram of the construction of the cat's paw steel structure of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0062] Figure 20The regional partition diagram of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0063] Figure 21 The cat's paw structure partition diagram of a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0064] Figure 22 The schematic diagram of assembling one side of the truss by making a single-piece small splicing formwork for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0065] Figure 23 The schematic diagram of making an overall assembly formwork for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0066] Figure 24 The diagram of assembling the lower purlin for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0067] Figure 25 The schematic diagram of assembling the lower continuous beam and the supporting beam for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0068] Figure 26 The schematic diagram of installing the cat's paw in pieces for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0069] Figure 27 The lifting schematic diagram for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0070] Figure 28 The completed lifting structure diagram for a construction method for installing the skylight keel on the inner roof of a long-span structure provided by some embodiments of the present invention.

[0071] Explanation of reference numerals:

[0072] 1. Skew bracing of the jig, 2. Ladder, 3. Purlin positioning bracket, 4. Base tie beam, 5. Jig base, 6. Upper purlin, 7. Lower purlin, 8. Upper continuous cross beam, 9. Lower continuous cross beam, 10. Skylight elevation keel, 11. Connector between keel and cross beam, 12. Lifting point, 13. Fixed pulley, 14. Suspension rope, 15. Running rope, 16. Electric winch, 17. Anchor rope, 18. Lifting point steering pulley, 19. Obstacle avoidance steering pulley, 20. Structural steel column, 21. Filling member, 22. No. 1 cat's paw, 23. No. 2 cat's paw, 24. No. 3 cat's paw, 25. No. 4 cat's paw, 26. Vertical keel of cat's paw, 27. Transverse secondary keel, 28. Skylight bracket, 29. Cat's paw supporting beam, 30. Continuous beam, 31. Gantry column, 32. Elevation cross beam, 33. Material stacking area, 34. Ground single-piece assembly area, 35. Assembly and lifting formwork area, 36. Area 1, 37. Area 2, 38. Area 3, 39. Secondary truss, 40. Block 1, 41. Block 2, 42. Block 3, 43. Block 4, 44. Truss, 45. Formwork, 46. Fixed corbel, 47. Side support, 48. Lower continuous beam, 49. Supporting beam, 50. Anti-instability steel wire rope, 51. Upper purlin, 52. Steel wire rope for lifting. Detailed implementation manners

[0073] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0074] Embodiment 1

[0075] As Figures 1 to 10 shown, a construction method for installing the skylight keel of the inner roof of a large-span structure in the first aspect embodiment of the present invention includes the following steps:

[0076] Step S100: Install the assembly jig.

[0077] Step S200: Install the upper purlin 6 of the roof structure and position the lower purlin 7 inside the jig.

[0078] Step S300: Install the upper and lower continuous cross beams (upper continuous cross beam 8, lower continuous cross beam 9) and the small assembled unit of the skylight elevation.

[0079] Step S400: Connect and install the main and secondary structural beams of the skylight.

[0080] Step S500: Arrange the lifting system.

[0081] Step S600, overall lifting;

[0082] Step S700, inserting and mending members.

[0083] In the above embodiments, it should be noted that the daylighting skylight: a daylighting structure provided in the inner courtyard of the arc truss and the outer connecting truss area to improve the daylighting conditions. The structural keel penetrates through the roof truss structure (the roof truss is a long-span structure with a truss height of more than 7m, and the height of the daylighting skylight needs to protrude from the roof maintenance structure, with a height of about 9m), and is fixed on the upper and lower purlins of the roof structure through vertical keels and horizontal through-connected connecting beams. The upper and lower parts of the daylighting skylight are made of tempered glass, and the side elevation is sealed with profiled steel sheets.

[0084] The electric winch 16 (motorized winch): driven by an electric motor, can, under various complex terrain conditions, change the magnitude of the force by means of a movable pulley and change the direction of the force by means of a fixed pulley 13 to complete various traction and lifting operations. Compared with a hoist, the electric winch 16 mainly uses the drum as a kind of movable pulley block, and the length of the steel wire rope is not limited. In this project, the structural height is high, and the lifting weight is in the range of 5 - 10t. It is very difficult to meet the use requirements with a hoist.

[0085] The technical effects achieved by the above embodiments are as follows: According to the structural characteristics of the inner courtyard of the arc truss and the connecting truss area between the outer arc truss and the floor-standing large arch, the skylight of the inner courtyard of the arc truss is segmented according to the main truss, and the outer connecting truss area is segmented according to the secondary truss. The segmented small assembling units are assembled and welded on the ground using a jig, and are integrally lifted by means of an electric winch and a fixed pulley to change the direction of the force multiple times.

[0086] Embodiment 2

[0087] As Figures 1 to 10 shown, a construction method for installing the keel of the inner roof skylight in a long-span structure includes all the contents of Embodiment 1. In addition, in step S100, the assembling jig is an overall assembling jig for the purlins below the lower chord of the roof and the skylight keel structure. The assembling jig includes:

[0088] Step S110, place the jig base 5 (at the ground position of the aerial projection) after positioning and setting out the lines, and connect the bases with the base connecting beam 4 to ensure the stability of the jig base 5 during the assembling process. The height of the jig base 5 is set to be convenient for the installation and welding of the lowermost components;

[0089] Step S120, install the positioning bracket 3 for the lower chord purlins. The height of the bracket is set according to the elevation of the purlins, and its stiffness is ensured;

[0090] Step S130, install the jig diagonal brace 1 on the jig base 5, mainly providing lateral support for the outside of the surface of the skylight vertical keel 10 and ensuring the overall stability of the jig. At the same time, install a temporary ladder 2 on the diagonal brace column for construction personnel to go up and down.

[0091] Step S200 includes:

[0092] Step S210: Use 3D scanning technology to monitor and adjust the installation positions of the upper chord purlins, upper continuous beams, lower chord lower purlins and lower continuous beams on the roof to ensure their accuracy and stability, and at the same time make adjustments on the ground in advance to meet the design requirements;

[0093] Step S220: When installing the lower chord lower purlins, set baffles at the bottom according to their slopes to prevent the purlins from slipping and ensure the safety and stability during the installation process.

[0094] Step S300 includes: Control the spatial position of the skylight facade keel 10. After adjusting its facade verticality and elevation, establish a connection between the brace 1 of the jig and the skylight facade keel 10 to ensure the overall stability of the small prefabricated unit during the ground installation and welding process; There is a keel and crossbeam connecting piece 11 at the lower part of the skylight facade keel 10.

[0095] Step S400 includes: Before installing the main and secondary beams of the skylight, it is necessary to inspect the skylight facade keel to ensure that its quality meets the requirements.

[0096] The lifting system in Step S500 consists of the structure to be lifted, the setting of lifting suspension points, sling ropes, running ropes, electric winches and their anchoring ropes, and the overall control system of the electric winch.

[0097] Step S500 includes:

[0098] Step S510: The lifting system needs to be analyzed through overall calculation and simulation to meet the strength, stiffness and stability of each component within the system;

[0099] Step S520: Regarding the layout of the lifting system, it is necessary to inspect the structure to be lifted, sling ropes 14, running ropes 15, electric winches 16 and their anchoring ropes 17, and at the same time conduct debugging before the trial lift to ensure the stability and reliability of the system;

[0100] Step S530: The lower suspension points of the sling ropes are determined according to the calculation for their hoisting positions on the ordinary steel beams. Use a shackle to connect the sling rope 14 to the horizontal keel at the upper surface position of the facade keel. The shackle can ensure the free passing of the sling rope, and the sling rope 14 can provide lateral stability support for the facade keel after being stressed;

[0101] Step S540: The sling rope 14 passes through the fixed pulley 13 at the upper lifting point to change the direction. To ensure that the main structure truss members and purlins do not affect the lifting of the skylight small prefabricated unit, add a set of fixed pulleys 13 at the inclined position of the lower chord of the lifting suspension point truss to restrict the direction of the steel wire rope inside the truss, lead the steel wire rope to the far-end column foot position of the steel structure (or set a ground anchor), and use the fixed pulley 13 to change the steel wire rope to the horizontal direction;

[0102] Step S550: The electric winch 16 is fixed at the position of the column foot of the ground steel column using a steel wire rope (the ground anchor can also be used for anchoring). The steel wire ropes that change the direction of the three groups of fixed pulleys are wound around the winch drum. (The number of winding turns changes the force on the end running rope, which is determined according to the lifting weight, generally 5 turns, following the principle of the movable pulley.) The end running rope is held fixed by two operators to prevent the steel wire rope on the drum from idling.

[0103] Step S560: The number of electric winches 16 for lifting is determined by the force condition at the lifting suspension point and the weight of the small prefabricated unit to be lifted. The overall operation is carried out through the winch control cabinet; as Figure 7 shown, the lifting point 12 is set at the top of the lifting system. During the lifting process, the lifting suspension point turning pulley 18 and the obstacle avoidance turning pulley 19 are set. The number of the obstacle avoidance turning pulleys 19 is set according to requirements. The structural steel columns 20 are connected by the anchoring ropes 17. The electric winches 16 are arranged on the anchoring ropes 17. The steel wire rope is adjusted from the sling rope to the running rope 15 turning pulley. The sling rope 14 successively bypasses the obstacle avoidance turning pulley 19 and the lifting suspension point turning pulley 18 upward.

[0104] Step S600 includes:

[0105] Step S610: After the lifting system is debugged and passed the acceptance, a trial lift is required. Under the condition that the force transmission of the skylight small prefabricated unit lifting system is determined, the trial lift lasts for 1 hour. During this period, the stability of each part of the lifting system and the use status of the small machinery of the turning pulley are checked.

[0106] Step S620: The overall lifting is carried out under the command of a special person. If any abnormality occurs to the personnel in charge of each branch of the lifting system, they shall report to the commander. The lifting is suspended, and it can only continue after the abnormality is handled.

[0107] Step S630: An infrared distance measuring device is equipped below the skylight small prefabricated unit to provide real-time feedback on the flatness of the lifted small prefabricated unit to the command platform and make adjustments before exceeding the allowable error of the specification.

[0108] Step S640: After the overall lifting is completed, it is necessary to mutually verify the deviation through three-dimensional scanning and the total station measurement and make adjustments. After the bolts between the upper through beam and the facade keel are connected and the lower chord purlins are fixed, the overall synchronous unloading is carried out through the winch control cabinet.

[0109] Step S700: The patch member 21 includes:

[0110] Step S710: Install the transverse keel and the main and secondary beams of the skylight between the two groups of small prefabricated hoisting units.

[0111] Step S720: After all installations are completed, use 3D scanning technology to review the installation deviation of the skylight keel structure. After passing the inspection, perform the side panel operation.

[0112] In step S600, before the overall lifting, calculate the uneven lifting of two lifting points or the uneven lifting of a single lifting point to determine the magnitude of the influence of the lifting method on the structural internal force, and eliminate the unfavorable lifting method.

[0113] Specifically, during normal hoisting, the maximum displacement is 6.8 mm and the maximum stress is 51.9 MPa; when using uneven hoisting at two points on the right with a difference of 40 mm (the distance between the lifting points is 8000 mm), the maximum stress is 52.1 MPa; when using uneven hoisting at two points on the right with a difference of 80 mm (the distance between the lifting points is 8000 mm), the maximum stress is 52.4 MPa; when using uneven hoisting at two points on the right with a difference of 400 mm (the distance between the lifting points is 8000 mm), the maximum stress is 56 MPa; when using uneven hoisting at one point on the right with a difference of 20 mm (the distance between the lifting points is 8000 mm), the maximum stress is 98.1 MPa; when using uneven hoisting at one point on the right with a difference of 40 mm (the distance between the lifting points is 8000 mm), the maximum stress is 185.8 MPa; when using uneven hoisting at one point on the right with a difference of 80 mm (the distance between the lifting points is 8000 mm), the maximum stress is 269.8 MPa. Therefore, if the uneven lifting of two points is used, the influence on the structural internal force is small. Even when the inclination reaches 5%, the structural stress only increases by 8%; if only the uneven lifting of one lifting point is used, the influence on the structural internal force is great. The inclination of this project should be limited to less than 0.5%. Specific embodiments

[0115] As Figures 11 to 28 shown, a construction method for installing the skylight keel of the inner roof in a long-span structure. The east entrance hall includes a total of 8 cat's paw structures, which are symmetrically distributed. There are 4 types of cat's paw structures in total, namely cat's paw No. 1 22, cat's paw No. 2 23, cat's paw No. 3 24, and cat's paw No. 4 25. Among them, the cat's paw No. 4 structure is the longest along the length direction, which is 81.375 m, and the cat's paw No. 1 structure is the shortest along the length direction, which is 49.674 m. The main components of the cat's paw structure are square cold-formed hollow steel sections and rectangular cold-formed hollow steel sections. Among them, the maximum cross-section of the square cold-formed hollow steel section is □80×80×4, which is located at the skylight bracket part, and the maximum cross-section of the rectangular cold-formed hollow steel section is □200×100×5, which is located at the skylight supporting beam part. The maximum plate thickness of the structural components is 6 mm, and the maximum plate thickness of the connecting parts is 8 mm. The main materials for on-site installation welding are Q235B and Q355B. The total weight of the steel structure of the cat's paw structure is about 260 t, and the profiled steel sheet is about 9500 m 2 , about 46 t.

[0116] The engineering quantity statistics table of the cat's paw structure is as follows:

[0117] Part Specification Material Engineering quantity Color Skylight bracket 28 □140×80×4, □80×80×4 Q235B 30.3 t Magenta Cat's paw supporting beam 29 □150×100×6, □200×100×5 Q355B 55.8 tons Dark blue Cat's paw vertical keel 26 □150×100×5 Q235B 111.6 tons Sky blue Horizontal secondary keel 27 □50×50×3 Q235B 49.6 tons Green Connectors, cover plates PL8, PL6 Q235B 12.7 tons Pressed steel plate 0.6 mm thick YX27 - 277 - 831 Q235B <![CDATA[9,500 meters 2 / 45.2 tons]]>

[0118] As shown in the above table, they are the dimensional specifications of the vertical keel 26, transverse secondary keel 27, skylight bracket 28, and cat's paw joist 29 in the cat's paw structure engineering construction in sequence.

[0119] Typical joints are as follows:

[0120]

[0121] As shown in the above table, they are the dimensional specifications of the continuous beam 30, gantry column 31, and elevation cross beam 32 in sequence. The main quantities of the steel structure are as follows:

[0122]

[0123]

[0124] As Figure 19 shown, from top to bottom, they are the material stacking area 33, ground single-piece assembly area 34, and assembly and lifting formwork area 35 in sequence.

[0125] As Figure 20 shown, from left to right, they are area one 36, area two 37, and area three 38 in sequence.

[0126] Analysis of the construction characteristics of the steel structure: The cat's paw steel structure is located on the north side of the truss, and the truss and roof purlins have been installed in many places, with multiple patches. Therefore, it is necessary to change the assembly plan according to the actual situation and adopt the method of high-altitude bulk assembly and sectional integral lifting simultaneously.

[0127] Overall idea of the installation plan: According to the overall progress requirements and combined with the actual situation of the construction site, the high-altitude bulk method is adopted inside the arc truss. To the east of the arc truss, it is lifted sectionally with the secondary truss as the boundary, and to the west of the arc truss, it is lifted sectionally with the main truss as the boundary.

[0128] Overall installation sequence: The construction is divided into blocks. Generally, the assembly of the unit body should be carried out in the order of first plane, then space, first middle, then both sides, and first bottom, then top. As shown in the figure, the sequence is 4# - 3# - 2# - 1#; at the same time, the installation of 5# - 6# - 7# - 8# is carried out.

[0129] Figure 21 Taking 1 cat's paw as an example, the installation sequence is block two 41 - block one 40; at the same time, the installation of block three 42 - block four 43 can be carried out. There is a secondary truss 39 between block two 41 and block three 42. This installation sequence will greatly reduce the displacement work of the lifting equipment, thereby reducing the construction period and improving the installation efficiency.

[0130] Ground assembly part:

[0131] Step 1: Fabricate the single-piece small assembly formwork 45 and assemble one side of the truss 44 (asFigure 22 as shown;

[0132] Step 2: Fabricate the overall assembly formwork, as Figure 23 shown, with side supports 47 provided at the lower part and fixed corbels 46 provided at the upper part;

[0133] Step 3: Assemble the lower purlins;

[0134] Step 4: Assemble the lower continuous beam 48 and the bearing beam 49;

[0135] Step 5: Install the cat's paw segments and fix them on the corbels;

[0136] Step 6: Hoist: The upper hoisting point on the cat's paw is located on the upper purlins of the roof structure, and the lower hoisting point is located on the bearing beam. Fix the winch to the bottom of the original structural column to complete the hoisting. Due to the disadvantage that there are a large number of filling segments as the secondary trusses and roof purlins have been installed, the cat's paw structure is hoisted in blocks with the secondary trusses as the boundary and the lower purlins of the roof structure are hoisted together with the cat's paw structure, as Figure 27 shown, with anti-instability steel wires 50 provided on the upper purlins 51 and hoisting steel wires 52 provided at the lower part;

[0137] Step 7: After the hoisting is in place, install the filling members at high altitude, remove the bearing beam, and complete the construction of this block.

[0138] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0139] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0140] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0141] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0142] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0143] In the description of this specification, the description with reference to terms such as "Embodiment 1", "Embodiment 2", "example", "specific example", or "some examples" means that the specific methods, devices, or characteristics described in connection 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, methods, devices, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0144] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for installing the keel of a skylight on the inner roof of a long-span structure, characterized in that, The skylight is a lighting structure set for the arc truss inner courtyard and the outer connecting truss area to improve the lighting conditions. The structural keel penetrates the roof truss structure. The roof truss is a long-span structure with a truss height of more than 7m. The height of the lighting skylight needs to protrude from the roof maintenance structure, with a height of 9m. It is fixed on the upper and lower purlins of the roof structure through vertical keels and horizontal continuous beams. The upper and lower parts of the lighting skylight are made of tempered glass, and the side elevation is sealed with profiled steel plates. According to the structural characteristics of the arc truss inner courtyard and the connecting truss area between the outer arc truss and the floor-standing large arch, the skylight of the arc truss inner courtyard is segmented according to the main truss, and the outer connecting truss area is segmented according to the secondary truss. The segmented small assembly units are assembled and welded on the ground using a jig, and the overall lifting is achieved by using an electric winch and a fixed pulley to change the force direction multiple times. It includes the following steps: Step S100, installation of the assembly jig. Step S200, installation of the upper purlins of the roof structure and in-place of the lower purlins in the jig. Step S300, installation of the upper and lower continuous crossbeams and the small assembly units on the skylight elevation. Step S400, connection and installation of the main and secondary structural beams of the skylight. Step S500, layout of the lifting system. Step S600, overall lifting. Step S700, installation of the filling members. Among them, step S200 includes: Step S210, using three-dimensional scanning technology to monitor and adjust the installation positions of the upper chord purlins, upper continuous beams, lower chord lower purlins and lower continuous beams on the roof to ensure their accuracy and stability, and at the same time making adjustments on the ground in advance to meet the design requirements. Step S220, when installing the lower chord lower purlins, set baffles at the bottom according to their slope to prevent the purlins from slipping and ensure the safety and stability during the installation process. Among them, in step S100, the assembly jig is an overall assembly jig for the lower purlins below the roof lower chord and the skylight keel structure. The assembly jig includes: Step S110, place the jig base after positioning and setting out the lines, and connect the bases with base connecting beams to ensure the stability of the jig base during the assembly process. The height of the jig base is set to be convenient for the installation and welding of the lowest components. Step S120, install the positioning brackets for the lower chord lower purlins. The height of the brackets is set according to the purlin elevation and ensure their stiffness. Step S130, install the jig diagonal braces on the jig base, mainly providing lateral support for the outside of the skylight elevation keel and ensuring the overall stability of the jig. At the same time, install a temporary climbing ladder on the diagonal brace columns for construction personnel to go up and down. Among them, step S300 includes: controlling the spatial position of the skylight elevation keel, after adjusting its elevation perpendicularity and elevation, establish a connection between the jig diagonal brace and the elevation keel to ensure the overall stability of the small assembly unit during the ground installation and welding process. Among them, step S700 includes: Step S710, install the transverse keels between the two groups of small assembly lifting units and the main and secondary beams of the skylight. Step S720, after all installations are completed, use three-dimensional scanning technology to review the installation deviation of the skylight keel structure. After passing the inspection, carry out the side sealing plate operation.

2. The installation construction method of the inner roof skylight keel of a long-span structure according to claim 1, characterized in that, Step S400 includes: before installing the main and secondary beams of the skylight, it is necessary to inspect the skylight elevation keel to ensure that its quality meets the requirements.

3. The construction method for installing the skylight keel on the inner roof of a long-span structure according to claim 1, characterized in that, In step S500, the lifting system components include the structure to be lifted, the lifting point settings, the sling ropes, the running ropes, the electric winches and their anchoring ropes, and the overall control system of the electric winches.

4. A construction method for installing the skylight keel on the inner roof of a long-span structure according to claim 3, characterized in that, Step S500 includes: Step S510: The lifting system needs to be calculated and simulated as a whole to meet the strength, stiffness and stability of each component within the system. Step S520: Regarding the layout of the lifting system, it is necessary to inspect the structure to be lifted, the sling ropes, the running ropes, the electric winches and their anchoring ropes, and perform debugging before the trial lift to ensure the stability and reliability of the system. Step S530: The lower lifting point of the sling rope determines its hoisting position on the ordinary steel beam according to the calculation. At the position where the sling rope meets the upper surface of the facade keel, a snap ring is used to connect the sling rope and the horizontal keel. The snap ring can ensure the free passage of the sling rope, and the sling rope can provide lateral stability support for the facade keel after being stressed. Step S540: The sling rope passes through the fixed pulley at the upper lifting point to change the direction. To ensure that the main structure truss members and purlins do not affect the lifting of the skylight small panel unit, a set of fixed pulleys is added at the inclined lower chord position of the lifting point to restrict the direction of the steel wire rope passing through the truss. The steel wire rope is led to the distal column foot position of the steel structure, and the steel wire rope is changed to the horizontal direction by using a fixed pulley. Step S550: The electric winch is fixed at the column foot position of the ground steel column with a steel wire rope. The steel wire ropes that change direction through 3 sets of fixed pulleys are wound around the winch drum, and the end running rope is held fixed by 2 operators to prevent the steel wire rope on the drum from idling. Step S560: The number of lifting electric winches is determined by the force condition at the lifting point and the weight of the lifted small panel unit, and the overall operation is through the winch control cabinet.

5. A construction method for installing the skylight keel on the inner roof of a long-span structure according to claim 1, characterized in that, Step S600 includes: Step S610: After the lifting system is debugged and passed the acceptance, a trial lift needs to be carried out. Under the condition that the force transmission of the skylight small panel unit lifting system is determined, the trial lift is for 1 hour. During this period, check the stable state of each part of the lifting system and the use state of the small tools of the steering pulleys. Step S620: The overall lift is carried out under the command of a special person. If any abnormality occurs to the person in charge of each branch of the lifting system, they shall report to the commander, and the lift shall be suspended. Only after the abnormality is handled can the lift continue. Step S630: An infrared ranging device is equipped below the skylight small panel unit to provide real-time feedback to the command platform on the flatness of the lifted small panel unit and make adjustments before exceeding the allowable error of the specification. Step S640: After the overall lift is completed, it is necessary to mutually verify the deviation through three-dimensional scanning and the total station measurement, and make adjustments. After the bolts between the continuous beam and the facade keel and the fixing of the lower chord purlins are connected, the overall synchronous unloading is carried out through the winch control cabinet.

6. A construction method for installing the skylight keel on the inner roof of a long-span structure according to claim 1, characterized in that, In step S600, before the overall lift, calculate the uneven lift of two lifting points or the uneven lift of a single lifting point, determine the influence of the lifting method on the internal force of the structure, and exclude the unfavorable lifting method.

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