Method for installing a steel structure of a stadium roof

Abstract

The application provides a stadium roof steel structure installation method, comprising the following steps: S1, transporting the steel structure into the field; S2, installing the steel column and performing secondary grouting on the bottom of the steel column; S3, reserving a pre-deformation value when each splicing unit of the truss is processed and laid out, and performing a trial hoisting after splicing; S4, first installing the main truss on one side of the opening and closing of the stadium, and then installing the main truss on the other side of the opening and closing of the stadium; and S5, performing prestressed cable construction after the roof steel structure construction is completed. The steel column for supporting the main truss is adjusted through a nut, and after adjustment, secondary grouting is performed to ensure the accuracy and stability of the main truss assembly, the hoisting scheme is optimized, the opening and closing of the stadium is divided into two sides, and the main truss installation on the two sides of the opening and closing of the stadium is sequentially performed, so that the stability of the main truss during construction is ensured, and the safety of construction is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel structure installation, and particularly relates to a method for installing a gymnasium roof steel structure. BACKGROUND

[0002] A gymnasium is a building for holding sports matches, sports exercises or concerts indoors, and is usually assembled by a steel structure. Due to large engineering quantity and complex construction procedures, it is very difficult to complete the structure construction within a given construction period considering the construction environment and working conditions in the construction implementation stage. The main difficulty of this type of gymnasium lies in the steel truss construction, and there are a large number of high-altitude and edge operations in the steel truss installation process. Therefore, how to construct the steel truss structure is an important technical scheme for solving the technical problems of this type of gymnasium construction.

[0003] Therefore, it is necessary to provide an improved technical scheme for the above-mentioned deficiencies of the prior art. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art, and provides a method for installing a gymnasium roof steel structure.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A method for installing a gymnasium roof steel structure, comprising:

[0007] Step S1, transporting the steel structure into the site;

[0008] Step S2, installing the steel column, re-measuring the pre-buried screw rod of the steel column before installation, and performing line laying on the pre-buried foundation, and adjusting the nut on the pre-buried screw rod according to the bottom elevation of the steel column; after the steel column is lifted into place by the crane, it is placed on the pre-buried screw rod, and the steel column foot is subjected to secondary grouting;

[0009] Step S3, reserving a pre-deformation value when each splicing unit of the truss is processed and laid out, and performing ground assembly of the truss of the roof on the construction site, and performing trial lifting after the assembly is completed;

[0010] Step S4, first installing the main truss of one side of the opening and closing structure of the gymnasium, then installing the main truss of the other side of the opening and closing structure of the gymnasium, installing the longitudinal truss between the main trusses of the two sides of the opening and closing structure of the gymnasium, and installing the main truss of the middle part of the gymnasium with the longitudinal truss as a support point;

[0011] installing the opening and closing structure of one side of the opening and closing structure of the gymnasium, and installing the opening and closing structure of the other side of the opening and closing structure of the gymnasium;

[0012] Step S5, performing prestressed cable construction after the roof steel structure construction is completed.

[0013] Preferably, in step S3, the truss is assembled by the jig, specifically including:

[0014] Step S301, the truss is projected and laid out longitudinally, and two rows of stirrups are installed along the longitudinal projection of the truss;

[0015] Step S302, two chord positioning is performed on the two rows of stirrups, and web members and short columns are installed between the two chords;

[0016] Step S303, after rechecking the truss, the connecting points between the splicing units are welded;

[0017] Step S304, the truss is painted and assembled on the ground.

[0018] Preferably, the truss splicing unit is preformed by 10-60mm.

[0019] Preferably, a side wall gap is provided in one side wall of the middle of the gymnasium, and a top gap corresponding to the side wall gap is provided in the middle of the roof, the side wall gap and the top gap form an opening and closing structure, the opening and closing structure includes two roof trusses that move relative to the center line of the opening and closing structure, the roof truss includes a plurality of arc-shaped steel beams, one end of the arc-shaped steel beam extends to the side wall gap, the other end of the arc-shaped steel beam extends to the top gap, and a secondary beam is provided between the two adjacent arc-shaped steel beams.

[0020] Preferably, a temporary square tube corresponding to the middle of the arc-shaped steel beam is provided above the main truss, and the temporary square tube is removed after the roof truss is installed.

[0021] Preferably, a guide mechanism corresponding to the two ends of the arc-shaped steel beam is provided on the outside of the side wall of the roof top and the civil structure, respectively, and the two ends of the arc-shaped steel beam are slidably assembled into the guide mechanism.

[0022] Preferably, in step S2, a support frame corresponding to the main truss is installed after the secondary grouting is completed, and the support frame is used to support the main truss;

[0023] The top of the column of the support frame is provided with a reinforcing steel beam, and the middle of the reinforcing steel beam is provided with two clamping short columns, and the spacing between the clamping short columns is matched with the diameter of the chord of the main truss;

[0024] An adjusting short column for supporting the chord of the main truss is provided in the middle of the reinforcing steel beam, and the support frame is removed after the roof steel structure construction is completed.

[0025] Preferably, the removal of the support frame includes:

[0026] Step 501, cutting off the adjusting short column of a certain height to release the stress of the main truss;

[0027] Step 502, remove the clamping short column, and then completely cut off the adjusting short column;

[0028] Step 503: Continue dismantling the reinforcing steel beams and support frames.

[0029] Beneficial effects: The steel columns supporting the main truss are adjusted with nuts, and then grouting is carried out again to ensure the accuracy and stability of the main truss assembly. The hoisting scheme is optimized by dividing the stadium into two sides from the opening and closing, and installing the main truss on both sides of the opening and closing in sequence, thereby ensuring the stability of the main truss during construction and ensuring the safety of construction. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0031] Figure 1 This is a schematic diagram of the roof steel structure in a specific embodiment provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the distribution of the main truss in a specific embodiment provided by the present invention;

[0033] Figure 3 This is a schematic diagram of the opening and closing structure in a specific embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the connection of the arc-shaped steel beam in a specific embodiment of the present invention;

[0035] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0036] Figure 6 for Figure 4 Enlarged diagram of point B in the middle.

[0037] In the diagram: 1. Main truss; 2. Secondary truss; 3. Curved steel beam; 4. Longitudinal truss; 5. Secondary beam; 6. Drive motor; 7. Upper rack; 8. Upper connecting arm; 9. Upper platform; 10. Upper limit wheel; 11. Upper limit track; 12. Upper support wheel; 13. Lower connecting arm; 14. Concrete track foundation; 15. Anchor bar; 16. Lower limit track; 17. Lower limit wheel; 18. Lower support wheel; 19. Positioning wheel; 20. Lower rack; 21. Gearbox; 22. Stop wheel. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0039] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be directly connected, or indirectly connected through intermediate components, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0040] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0041] As shown in Figures 1-6 The present application provides a method for installing a stadium roof steel structure, step S1, the steel structure is transported to the site, after the steel structure is transported to the specified stacking site, a 25t truck crane is used for unloading; step S2, steel column installation is performed, before installation, the pre-buried screw rod of the steel column is re-measured, and the pre-buried foundation is used for line laying, and the nut on the pre-buried screw rod is adjusted according to the bottom elevation of the steel column; after the steel column is lifted into place by the crane, it is placed on the pre-buried screw rod, and the steel column foot is grouted again to further stabilize the steel column. In the part where the concrete elevation is greater than the design elevation, a pad plate is arranged on the foundation to pad and level, that is, a pad plate is arranged at each corner of the steel column, and a surveyor traces and copies the level to make the steel column directly installed in place. Each group of pad plates should not be more than 4. The contact between the pad plate and the concrete foundation surface and the bottom surface of the steel column should be smooth and tight. Step S3, the pre-deformation value is reserved when the truss each splicing unit is processed and laid out, the truss of the roof is assembled on the ground at the construction site, and after the assembly is completed, a trial hoisting is performed; step S4, first, the main truss 1 of one side of the stadium opening and closing is installed, the outermost main truss 1 is first installed on this side, the secondary truss 2 between the outermost main truss 1 and the civil structure is connected, then the next main truss 1 is installed, the secondary truss 2 between the main trusses 1 is connected, and the installation of the main truss 1 is sequentially performed to the opening and closing; then the main truss 1 of the other side of the stadium opening and closing is installed, the installation method of the main trusses 1 on both sides is the same, the longitudinal truss 4 between the main trusses 1 on both sides of the stadium opening and closing is installed, the main truss 1 in the middle of the stadium is installed with the longitudinal truss 4 as a support point, after the main truss 1 is installed, the opening and closing structure is installed, the opening and closing structure on one side of the stadium opening and closing is installed, and the opening and closing structure on the other side of the stadium opening and closing is installed; step S5, after the roof steel structure construction is completed, prestressed cable construction is performed.

[0042] In an optional embodiment, in step S3, the truss is assembled by the jig, specifically comprising: step S301, the truss is projected and laid out in longitudinal direction, and two rows of stirrups are installed along the longitudinal projection of the truss;

[0043] Step S302, two chord positioning is respectively performed on the two rows of stirrups, and web members and short columns are installed between the two chords; step S303, after the truss is rechecked, the connecting points between the spliced units are welded; step S304, the truss is painted, the ground assembly of the truss is completed, and the trial lifting is performed before hoisting, and the truss can be formally hoisted after confirming that there is no problem. Since the cable-stayed beam of the gymnasium has different stress conditions before and after the installation of the cable, the pre-deformation value needs to be considered when processing and laying out. The pre-deformation value is from 10mm to-60mm, and the pre-deformation value reserved by the truss splicing unit is 10-60mm.

[0044] In an optional embodiment, a side wall gap is arranged on one side wall in the middle of the gymnasium, a top gap corresponding to the side wall gap is arranged in the middle of the roof, the side wall gap and the top gap intersect with each other to form an opening and closing opening, the opening and closing structure includes two roof trusses, and the two roof trusses move relative to the center line of the opening and closing opening, so that the opening and closing opening can be opened and closed. The roof truss includes a plurality of arc-shaped steel beams 3, two sections of the arc-shaped steel beam 3 are straight beams, the arc-shaped steel beam 3 is transitioned through an arc-shaped part at the intersection of the side wall gap and the top gap, one end of the arc-shaped steel beam 3 extends to the side wall gap, the other end of the arc-shaped steel beam 3 extends to the top gap, and a secondary beam 5 is arranged between the two adjacent arc-shaped steel beams 3.

[0045] In this embodiment, in order to ensure the installation stability of the opening and closing structure, a temporary square tube corresponding to the middle of the arc-shaped steel beam 3 is arranged above the main truss 1 during the assembly of the opening and closing structure, and the temporary square tube is removed after the installation of the roof truss is completed. The temporary square tube is connected to the main truss 1 by bolts or welding.

[0046] The roof top and the outer side of the side wall of the civil structure are respectively provided with a guide mechanism corresponding to the two ends of the arc-shaped steel beam 3, and the two ends of the arc-shaped steel beam 3 are respectively slidably assembled with the guide mechanism. In this way, the opening and closing structure can stably move relative to the two sides of the opening and closing opening. The roof guide mechanism is fixed on the main truss 1 by welding, and the side wall guide mechanism on the outer side of the civil structure is fixed on the ground. The straight beam corresponding to the side wall gap of the arc-shaped steel beam 3 is vertically arranged, so that most of the gravity is borne on the guide mechanism on the outer side of the side wall, and the roof top guide mechanism mainly limits the arc-shaped steel beam 3.

[0047] In the embodiment, the guiding mechanism outside the side wall comprises two lower limiting tracks 16 extending along the opening and closing direction of the roof truss, a plurality of columns are arranged below the two lower limiting tracks 16, the columns are anchored on the concrete track foundation 14 through the bottom anchoring rib 15, the end of the arc-shaped steel beam 3 is provided with a lower pedestal, the end of the lower pedestal is provided with two lower supporting wheels 18 corresponding to the upper surfaces of the two lower limiting tracks 16 respectively, two lower limiting wheels 17 extending to the two sides of the lower limiting tracks 16 are arranged on the two sides of the lower pedestal, and lower limiting protrusions corresponding to the lower limiting wheels 17 are arranged on the two sides of the lower limiting tracks 16.

[0048] Connecting columns are arranged between the columns of the two lower limiting tracks 16 to fix the two lower limiting tracks 16, and sliding surfaces are arranged on the adjacent sides of the two lower limiting tracks 16, and a positioning wheel 19 extending to the space between the two lower limiting tracks 16 and corresponding to the two sliding surfaces is arranged in the middle of the lower pedestal.

[0049] A driving device is arranged outside the limiting track corresponding to the concrete track foundation 14, and the driving device is anchored on the concrete track foundation 14 through the anchoring rib 15.

[0050] The guiding mechanism at the top of the roof cover is an upper limiting track 11 extending along the opening and closing direction of the roof truss, the end of the arc-shaped steel beam 3 is provided with an upper pedestal 9, the lower side of the upper pedestal 9 is provided with an upper supporting wheel 12 corresponding to the upper surface of the upper limiting track 11, positioning tracks are arranged on the two sides of the upper limiting track 11, upper limiting wheels 10 corresponding to the two positioning tracks are arranged on the two sides of the upper pedestal 9, lower limiting protrusions are arranged below the upper limiting wheels 10, and the lower limiting protrusions extend to the lower side of the lower limiting protrusions.

[0051] The driving device corresponding to the arc-shaped steel beam 3 is arranged on the main truss 1, and the driving device at the top of the roof cover fixes the main truss 1 through a steel rib support.

[0052] In the embodiment, a lower rack 20 is arranged at the lower end of the roof truss, the lower rack 20 is connected to the lower end of the arc-shaped steel beam 3 or the secondary beam 5 between the arc-shaped steel beams 3 through a lower connecting arm 13, the tooth surface of the lower rack 20 is located on the side away from the arc-shaped steel beam 3, the driving device is a driving motor 6, the driving motor 6 is connected to a driving gear corresponding to the lower rack 20 through a gearbox 21, and extension plates extending to the lower rack 20 are arranged on the upper and lower sides of the gearbox 21, and the inner sides of the extension plates are provided with stop wheels 22 stopping the side away from the tooth surface of the lower rack 20.

[0053] An upper rack 7 is arranged at the upper end of the roof truss, the upper rack 7 is connected to the lower end of the arc-shaped steel beam 3 or the secondary beam 5 between the arc-shaped steel beams 3 through an upper connecting arm 8, the tooth surface of the upper rack 7 is located on the side away from the arc-shaped steel beam 3, the driving device is a driving motor 6, the driving motor 6 is connected to a driving gear corresponding to the upper rack 7 through a gearbox 21, and extension plates extending to the upper rack 7 are arranged on the upper and lower sides of the gearbox 21, and the inner sides of the extension plates are provided with stop wheels 22 stopping the side away from the tooth surface of the upper rack 7.

[0054] In an optional embodiment, in step S2, the support frame corresponding to the main truss 1 is installed after the secondary grouting is completed. A quadrilateral support frame is adopted, with a planar size of 1.6 m x 1.6 m, a bay height of 1.76 m, a maximum erection height of 20 m, round pipes for the vertical rods and the web rods, a P159 x 8 specification for the vertical rods, a P60 x 4.5 specification for the horizontal web rods, a P76 x 4.5 specification for the inclined web rods, a Q235B material, and a HN400 x 200 x 8 x 13 specification for the top conversion steel beam, with a Q235B material. The column foot of the support frame is the original soil compacted foundation surface after excavation, and the column top is used to support the main truss 1.

[0055] The column top of the support frame is provided with a reinforcing steel beam, and the middle part of the reinforcing steel beam is provided with two clamping short columns with a spacing matched with the chord diameter of the main truss 1. To ensure the stability of the support to meet the construction requirements, a support frame foundation should be designed between the support frame installations, a reinforced concrete pile cap is adopted, and the specific method is to adopt a double-layer bidirectional φ10@170, with a pile cap planar size of 4800 mm * 2200 mm, a thickness of 300 mm, and a concrete strength of C30. The middle part of the reinforcing steel beam is provided with an adjusting short column for supporting the chord of the main truss 1, and the support frame is removed after the completion of the roof steel structure construction.

[0056] In an optional embodiment, the removal of the support frame includes: step 501, cutting off the adjusting short column of a certain height to release the stress of the main truss 1, and specifically cutting off the end part of the short column by 8 mm during unloading. Step 502, remove the clamping short column, and then completely cut off the adjusting short column, at which time the main truss 1 is separated from the support frame, step 503, continue to remove the reinforcing steel beam and the support frame.

[0057] In an optional embodiment, the installation and tensioning construction of the cable are performed after the completion of the roof steel structure construction, and the cable tensioning construction scheme includes:

[0058] A bed frame is erected on the ground, the cable is spread between the bed frames, the main cable is hoisted and pre-tightened, after the completion of the welding seam inspection and acceptance of the roof steel structure, the tensioning tooling is hoisted and the hydraulic equipment is debugged, the main cable is divided into multiple batches, and is symmetrically tensioned from the middle part of the opening to both sides, and is tensioned to the design requirement of the preset cable force according to the pre-tightening of 10% -> 50% -> 80% -> 100%, and finally is over-tensioned by 5%; after the completion of the cable tensioning, the secondary beam 5 of the main truss 1 is connected to the gymnasium side wall body.

[0059] In an optional embodiment, the steel column comprises multiple sections, and a lifting point is arranged at the upper portion of each section of the steel column, four temporary connecting lugs are used as the lifting point, before hoisting, the slag and floating rust on the top surface of the lower section of the steel column and the bottom surface of the current section of the steel column are to be cleaned, and the upper and lower sections of the steel column are to be abutted and tightly contacted. The center line of the steel column should be consistent with the center line of the lower section of the steel column, the elevation and axis deviation of the top surface of the lower section of the steel column and the twist value of the steel column should be controlled within the specification, and the reverse offset regression to the original position should be considered when hoisting the upper section of the steel column, the lower end of the upper section of the steel column is provided with a movable double clamp plate, the movable double clamp plate is clamped to the corresponding mounting lug of the lower section of the steel column and then fixed through bolts, after the completion of the steel column, initial calibration can be performed, so as to install the steel column and the inclined brace. Before installation, the embedded parts are to be re-measured and the line is to be laid. The screw cap on the screw rod is to be adjusted according to the bottom elevation of the steel column. Then the steel column is directly installed in place.

[0060] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is within the protection scope of the claims of the present application.

Claims

1. A method for installing a steel structure roof of a gymnasium, characterized in that, include: Step S1: Steel structure transported to site; Step S2: Install the steel column. Before installation, re-measure the pre-embedded bolts of the steel column and lay out the lines on the pre-embedded foundation. Adjust the nuts on the pre-embedded bolts according to the bottom elevation of the steel column. After the steel column is lifted into place by a crane, it is placed on the pre-embedded bolts, and the bottom of the steel column is grouted a second time. Step S3: When processing and laying out each splicing unit of the truss, a pre-deformation value is reserved. The roof truss is assembled on the ground at the construction site. After the assembly is completed, a trial lift is carried out. Step S4: First, install the main truss on one side of the gymnasium opening and closing mechanism, then install the main truss on the other side of the gymnasium opening and closing mechanism. Install a longitudinal truss between the main trusses on both sides of the gymnasium opening and closing mechanism, and use the longitudinal truss as a support point to install the main truss in the middle of the gymnasium. Install the opening and closing structure on one side of the gymnasium's opening and closing mechanism, and install the opening and closing structure on the other side of the gymnasium's opening and closing mechanism; Step S5: After the roof steel structure construction is completed, the prestressed cable installation is carried out. A side wall notch is provided on one side wall in the middle of the stadium, and a top notch corresponding to the side wall notch is provided in the middle of the roof. The side wall notch and the top notch form an opening and closing structure. The opening and closing structure includes two roof trusses that move relative to each other about the center line of the opening and closing structure. The roof trusses include multiple arc-shaped steel beams. One end of the arc-shaped steel beam extends toward the side wall notch, and the other end of the arc-shaped steel beam extends toward the top notch. A secondary beam is provided between two adjacent arc-shaped steel beams. The roof top and the outer side wall of the civil structure are respectively equipped with guide mechanisms at both ends of the corresponding arc-shaped steel beams, and the guide mechanisms are slidably assembled at both ends of the arc-shaped steel beams; The roof guide mechanism is fixed to the top of the main truss by welding. The guide mechanism on the outside of the side wall of the civil structure is fixed to the ground. The curved steel beams are vertically arranged with straight beams corresponding to the side wall notches, so that the weight is borne on the guide mechanism on the outside of the side wall. The roof top guide mechanism is used to limit the curved steel beams. The guide mechanism on the outside of the side wall includes two lower limit rails extending along the opening and closing direction of the roof truss. Multiple columns are provided below the two lower limit rails. A lower platform is provided at the end of the arc-shaped steel beam. Two lower support wheels are provided at the end of the lower platform, corresponding to the upper surfaces of the two lower limit rails respectively. Lower limit wheels are provided on both sides of the lower platform, extending towards the two lower limit rails. Lower limit protrusions are provided on both sides of the lower limit rails, corresponding to the lower limit wheels. A connecting column is provided between the columns of the two lower limit rails to fix the two lower limit rails; a sliding surface is provided on the adjacent side of the two lower limit rails; a positioning wheel is provided in the middle of the lower platform, extending between the two lower limit rails and corresponding to the two sliding surfaces; a driving device is provided on the outside of the concrete rail foundation corresponding to the limit rails. The top guide mechanism of the roof is an upper limit track extending along the opening and closing direction of the roof truss. The end of the arc-shaped steel beam is provided with an upper platform. Below the upper platform is an upper support wheel corresponding to the upper surface of the upper limit track. Positioning rails are provided on both sides of the upper limit track. Upper limit wheels corresponding to the two positioning rails extend from both sides of the upper platform. An upper limit ridge is provided below the upper limit wheel, and the upper limit ridge extends to the lower part of the upper limit ridge. The main truss is provided with a drive device corresponding to the arc-shaped steel beam.

2. The method for installing the steel structure of a gymnasium roof according to claim 1, characterized in that, In step S3, the truss is assembled using a jig, specifically including: Step S301: Loft the truss longitudinally and install two rows of stirrups along the longitudinal projection of the truss. Step S302: Position two chords on the two rows of stirrups respectively, and install the web member and short column between the two chords; Step S303: After re-measuring the truss, weld the connection points between each splicing unit; Step S304: Paint the truss to complete the ground assembly of the truss.

3. The method for installing the steel structure of a gymnasium roof according to claim 2, characterized in that, The pre-deformation value reserved for the truss splicing unit is 10-60mm.

4. The method for installing the steel structure of a gymnasium roof according to claim 1, characterized in that, A temporary square tube is installed in the middle of the corresponding arc-shaped steel beam above the main truss. The temporary square tube is removed after the roof truss is installed.

5. The method for installing the steel structure of a gymnasium roof according to claim 1, characterized in that, In step S2, after the secondary grouting is completed, the support frame of the corresponding main truss is installed. The support frame is used to support the main truss. The support frame has a reinforcing steel beam at the top of the column, and two short locking columns in the middle of the reinforcing steel beam. The spacing between the short locking columns is adapted to the diameter of the chord of the main truss. Adjustable short columns supporting the main truss chords are installed in the middle of the reinforced steel beams. The support frame is removed after the roof steel structure construction is completed.

6. The method for installing the steel structure of a gymnasium roof according to claim 5, characterized in that, Dismantling the support frame includes: Step 501: Remove the adjusting short column of a certain height to release the stress of the main truss; Step 502: Remove the retaining post and then completely cut off the adjusting post; Step 503: Continue dismantling the reinforcing steel beams and support frames.

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