Temporary support construction method for large-span steel structure roof

Abstract

This application discloses a construction method for temporary supports for a large-span steel structure roof, relating to the technical field of steel structure reinforcement construction. The method includes the following construction steps: S1: Prefabricate a support structure on the ground, with one end of the support structure hinged to the ground; S2: Raise the free end of the support structure until it is far from the ground; S3: Install a lifting device between the support structure and the ground on the side closest to the ground, and continue raising the free end of the support structure using the lifting device. The support structure rotates around the hinged end until the free end of the support structure can be connected to the original steel structure roof; S4: Hinged and fixed the free end of the support structure to the original steel structure roof. This application effectively reduces the impact of temporary support construction on the safety and stability of the original steel structure roof.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steel structure reinforcement construction, in particular to a large-span steel structure roof temporary support construction method. BACKGROUND

[0002] With the development of society, more and more large sports venues are built, and a common form of the sports venues is an elliptical semi-closed sports venue. The elliptical semi-closed sports venue is usually built by using a steel structure, and an open space is arranged above a race area, and a cantilever type steel structure roof is designed above a stand to achieve shielding.

[0003] When reinforcing and repairing the sports venue, a temporary support is usually arranged below the cantilever type steel structure roof to improve the stability and safety of the cantilever type steel structure roof in the reinforcement construction process, and the temporary support is also used to share the dead weight and construction load of the structure to prevent the cantilever type steel structure roof from being deformed and damaged too much during reinforcement.

[0004] The installation method of the traditional temporary support mainly includes a hoisting method and a suspension method. The hoisting method is used to cooperate with two cranes to position the temporary support, and then the temporary support is fixed and installed on the cantilever type steel structure roof to achieve support. The hoisting method has the following problems. On the one hand, the hoisting method occupies the crane for a long time and wastes the crane resources. On the other hand, the crane needs to be higher than the temporary support to hoist, and the roof structure often needs to be temporarily disassembled, and the hoisting steel wire rope needs to be deeply inserted from the gap of the steel structure, so that the safety and flexibility are poor.

[0005] The suspension method can avoid the problem of disassembling the roof structure, but the crane still needs to be cooperated in the whole process, and the dead weight of the temporary support needs to be borne by the cantilever type steel structure roof before the temporary support is installed. The new node load on the original steel structure roof is not conducive to the structural stability of the original steel structure.

[0006] Therefore, there is an urgent need for a temporary support construction method which has little influence on the safety and stability of the original structure roof and is good in construction economy. SUMMARY

[0007] In order to improve the problem that the temporary support construction has an influence on the safety and stability of the original steel structure roof, the application provides a large-span steel structure roof temporary support construction method.

[0008] The application provides a large-span steel structure roof temporary support construction method, which adopts the following technical scheme:

[0009] A large-span steel structure roof temporary support construction method, comprising the following construction steps:

[0010] S1: a support structure is prefabricated on the ground, and one end of the support structure is hinged to the ground;

[0011] S2: lifting a free end of the support structure away from the ground;

[0012] S3: installing a jacking element between the ground and a side of the support structure close to the ground, and continuing to lift the free end of the support structure through the jacking element, and rotating the support structure around the hinged end until the free end of the support structure can be connected with the original steel structure roof;

[0013] S4: hingedly fixing the free end of the support structure with the original steel structure roof.

[0014] By adopting the above technical solution, one end of the support structure is locked on the ground, and the support structure is then jacked up from the ground until the support structure is rotated upward around the hinge point to a vertical state, and then the top end of the support structure is hinged with the original steel structure roof, thereby completing the construction of the temporary support under the original steel structure roof.

[0015] When the temporary support construction is performed by using the construction method of the present application, no new load is formed on the original steel structure roof, and the influence on the structural stability of the original steel structure roof is small. During the construction process, the application of large mechanical equipment is reduced, on the one hand, the economy of the construction is higher, and the requirements for the site during the construction process are reduced; on the other hand, the problem of poor construction flexibility in the lifting method is solved.

[0016] Optionally, the original steel structure roof comprises a steel member for connecting with the support structure.

[0017] The support structure comprises a top connecting head and a bottom connecting seat respectively arranged at two ends, and a main body connecting the top connecting head and the bottom connecting seat, a spherical hinge support for hingedly connecting with the bottom connecting seat is arranged on the ground, and the top connecting head is rotationally connected with the steel member.

[0018] By adopting the above technical solution, the upper and lower ends of the support structure are hingedly connected with the original steel structure roof and the ground by using the top connecting head and the bottom connecting seat respectively, so as to realize the fixation of the support structure. Hingedly connecting the two ends of the support structure can reduce the stress concentration at the connection, so that the support structure only needs to bear the vertical pressure transmitted by the steel structure, thereby playing a role of temporary support and reducing the torque force borne by the support structure. If the two ends of the support structure are fixedly connected with the original steel structure roof and the ground respectively, when each component is slightly deformed or displaced, a large stress will be generated at the connection between the two ends of the support structure, causing connection failure. Hingedly connecting the two ends of the support structure enables the support structure to be more stably supported between the original steel structure roof and the ground.

[0019] Optionally, the top connecting head comprises:

[0020] a connecting portion for detachably connecting with the original steel structure roof;

[0021] A stress diffusion part is fixedly connected with the main body and is used for uniformly transmitting stress at the connecting joint to the main body.

[0022] A hinged part includes a first lug plate fixed on the connecting part and a second lug plate fixed on the stress diffusion part, and the first lug plate and the second lug plate are rotationally connected.

[0023] By adopting the above technical scheme, the stable connection between the support structure and the original steel structure roof is realized by the connecting part, and the rotational connection between the support structure and the original steel structure roof is realized by the hinged part. Since the connecting joint area of the support structure and the original steel structure roof is small, the stress at the connecting joint can be uniformly transmitted to the main body by the stress diffusion part, so that the support structure can more stably support the original steel structure roof.

[0024] Optionally, the main body includes a plurality of standard sections, and in the S1 step, the top connecting head, the plurality of standard sections and the bottom connecting seat are transported to the construction site and are sequentially assembled on site to form the support structure.

[0025] By adopting the above technical scheme, the support structure is convenient and simple to transport, and can be transported without large machinery, so that the whole process can be realized by small machinery, the requirement for the site is reduced, and the applicability of the construction method is wider.

[0026] Optionally, in the S2 step, a temporary support frame is first erected on the ground, and a hoisting device is used to hoist the free end of the support structure and place it on the temporary support frame.

[0027] In the S3 step, the jacking member includes a first jacking device and a second jacking device, the first jacking device is arranged near the free end of the support structure, and the second jacking device is arranged near the hinged end of the support structure. The first jacking device and the second jacking device sequentially lift the support structure until the free end of the support structure is connected with the original steel structure roof.

[0028] By adopting the above technical scheme, when the support structure is jacked upward, the free end of the support structure is first hoisted to the temporary support frame, so that there is a space for arranging the jacking member between the support structure and the ground. The first jacking device and the second jacking device are arranged between the ground and the support structure, and the support structure is jacked by the first jacking device and the second jacking device in sequence, so that the support structure can be quickly jacked and rotated to the vertical state.

[0029] Optionally, in the S3 step, after the first jacking device and the second jacking device are installed, a bumper device is installed between the side of the support structure away from the ground and the ground, and the two ends of the bumper device are respectively hinged to the support structure and the ground.

[0030] By adopting the technical scheme, the fender device is arranged to prevent the support structure from excessively rotating during the jacking process, so that the support structure is prevented from rotating more than 90 degrees.

[0031] Optionally, the sliding rail is fixedly installed on the ground in the S1 step, and the spherical hinge support is slidably arranged in the sliding rail, and the spherical hinge support is fixed on the sliding rail after the bottom connecting base is rotated to be connected to the ground only by the spherical hinge support.

[0032] By adopting the technical scheme, when the support structure is hoisted to the temporary support frame, the end of the support structure close to the ground will slip, and the sliding rail is arranged to reduce the sliding resistance of the support structure, thereby reducing the abrasion and damage of the support structure during the sliding process.

[0033] In addition, the upper and lower end connecting points of the support structure should be on the same vertical line to reduce the torque force borne by the support structure during the temporary support. First, the connecting point of the support structure and the upper original steel structure roof is determined, the sliding rail is arranged to facilitate the adjustment of the horizontal position of the lower end of the support structure, and then the position of the ground hinged end of the support structure is adjusted along the sliding rail after the support structure is hoisted to the temporary support frame. After the adjustment is completed, the spherical hinge support is fixed on the sliding rail, and then the rotation of the support structure is performed. In this way, when the support structure is rotated to the vertical position, the top end of the support structure can be aligned with the determined connecting point.

[0034] Optionally, the connecting part comprises a force transmission beam, the force transmission beam is fixedly connected with the hinged part, one end of the force transmission beam away from the hinged part is fixed with a constraint frame, a limiting groove is formed in the constraint frame, and the constraint frame and the force transmission beam form a limiting space.

[0035] By adopting the technical scheme, the force transmission beam serves as the main body of the connecting part, is used for receiving and collecting the load transmitted by the original steel structure roof, and enables the hinged part and the connecting part to be fixedly connected. The constraint frame is arranged to realize the connection between the original steel structure roof and the support structure. The constraint frame only limits the original steel structure roof and has an active space at the connection, and is not fixedly connected with the original steel structure roof, thereby reducing the stress concentration at the connection, enabling the original steel structure roof to mainly transmit the pressure to the support structure, and enabling the support structure to better support the original steel structure roof.

[0036] Optionally, the side wall of the limiting groove away from the force transmission beam is fixed with an elastic member, and the elastic member is clamped between the constraint frame and the steel member.

[0037] By adopting the technical scheme, the elastic member is arranged to buffer when the original steel structure roof moves within the range limited by the force transmission beam, reduce the impact between the original steel structure roof and the force transmission beam, and avoid damage between components.

[0038] Optionally, the force transmission beam is fixedly provided with a supporting member, the supporting member is used to abut against the steel component, and a side wall shape of the supporting member in contact with the steel component matches a side wall shape of the steel component.

[0039] By adopting the technical scheme, the supporting member matching the shape of the original steel structure roof is arranged on the force transmission beam, the original steel structure roof can be more efficiently and smoothly transmitted to the support structure, and the original steel structure roof can be properly fixed.

[0040] In summary, the application has at least one of the following beneficial effects:

[0041] 1. The construction method has smaller requirements for a construction site, lower use rate of large equipment, is more economical, and is suitable for temporary support of a sports stadium cantilever steel structure roof under various working conditions, and has strong applicability.

[0042] 2. When the construction method is used for temporary support construction, no load needs to be applied to the original steel structure roof, or the original sports stadium structure needs to be damaged and removed, and damage and influence on the original structure are reduced.

[0043] 3. The jacking member and the bumper device are arranged, the support structure can be more safely and stably jacked and rotated, and the construction risk is lower when the support structure is rotated and installed.

[0044] 4. Both ends of the support structure are arranged as hinged ends, internal stress concentration at the connection is reduced, and the support structure can better support the original steel structure. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a schematic view of the support structure before assembly in step one of the embodiment of the application;

[0046] Figure 2 is a schematic view of the overall structure of the support structure of the embodiment of the application;

[0047] Figure 3 is a schematic view of the construction after step two of the embodiment of the application is completed;

[0048] Figure 4 is a construction effect view of the installation of the two-stage jacking device in step three of the embodiment of the application;

[0049] Figure 5is the construction effect diagram in the jacking process of the support structure in step three of the embodiment one of the present application;

[0050] Figure 6 is the effect diagram of jacking the support structure upward by the inner row construction frame in step three of the embodiment two of the present application;

[0051] Figure 7 is the effect diagram of jacking the support structure upward by the outer row construction frame in step three of the embodiment two of the present application;

[0052] Figure 8 is the effect diagram of jacking the support structure upward after the temporary support frame is added in step three of the embodiment two of the present application;

[0053] Figure 9 is the construction effect diagram after the jacking of the support structure is completed in step three of the embodiment of the present application;

[0054] Figure 10 is the structural schematic diagram of the top connecting head and the original steel structure roof connecting node in the embodiment of the present application.

[0055] Explanation of reference signs: 1, support structure; 11, top connecting head; 111, connecting part; 1111, force transmission beam; 1112, constraint frame; 1113, elastic piece; 1114, gasket; 1115, support piece; 112, stress diffusion part; 113, first ear plate; 114, second ear plate; 12, bottom connecting seat; 13, main body; 131, standard section; 2, first jacking device; 3, second jacking device; 4, temporary support frame; 41, inner row construction frame; 42, outer row construction frame; 5, bumper device; 6, sliding track; 7, original steel structure roof; 71, steel member; 8, limiting space. DETAILED DESCRIPTION

[0056] The following will be combined with the Figures 1-10 The present application is further described in detail.

[0057] The large-span steel structure roof temporary support construction method disclosed in the embodiment of the present application realizes the temporary support of the overhanging steel structure roof by arranging a plurality of support structures 1 between the overhanging steel structure roof and the ground.

[0058] A large-span steel structure roof temporary support construction method includes the following construction steps:

[0059] Step one: refer to Figure 1 and Figure 2, the ground support structure 1 is assembled. The ground support structure 1 is assembled in the stadium. The support structure 1 comprises a top connecting head 11 and a bottom connecting seat 12 arranged at two ends respectively, and a main body 13 arranged between the top connecting head 11 and the bottom connecting seat 12. The main body 13 comprises a plurality of standard sections 131 in the form of truss structure. After the top connecting head 11, the bottom connecting seat 12 and the plurality of standard sections 131 are transported to the stadium, the support structure 1 is assembled. During the assembly, the adjacent two standard sections 131, the standard section 131 and the top connecting head 11, and the standard section 131 and the bottom connecting seat 12 are detachably connected by bolts.

[0060] In the application, the standard section 131 is designed in the form of truss structure, so that the standard section 131 has stronger structural stability and stronger pressure bearing capacity, thereby more stably supporting the original steel structure roof 7 above; the detachable connection between the standard section 131, the top connecting head 11 and the bottom connecting seat 12 can be realized by the bolts, thereby realizing the multiple installation and disassembly of the support structure 1. The connection by the bolts can ensure the strength and stability of the connection.

[0061] Referring to Figure 2 and Figure 3 , after the support structure 1 is assembled, the fixing point of the original steel structure roof 7 and the support structure 1 is determined, and a sliding track 6 is arranged directly below the fixing point. The sliding track 6 is fixed on the ground, and a spherical hinge support is slidably arranged in the sliding track 6. The bottom connecting seat 12 is fixedly connected with the spherical hinge support, thereby realizing the hinging of the support structure 1 and the ground.

[0062] Step two: referring to Figure 3 , the support structure 1 is lifted. The free end of the support structure 1 is lifted and placed on the temporary support frame 4 arranged on the ground. The lifting of the free end of the support structure 1 can be realized by a small crane or a tower crane.

[0063] Since one end of the support structure 1 is hinged to the ground, when the free end of the support structure 1 is lifted to the temporary support frame 4, the support structure 1 slides along the sliding track 6. After the lifting is completed, the spherical hinge support is fixed to the sliding track 6, and the fixing point of the spherical hinge support is located directly below the fixing point of the original steel structure roof 7 and the support structure 1.

[0064] Step three, referring to Figure 4 and Figure 5 , the support structure 1 is jacked up. After step two, there is a gap between the support structure 1 and the ground. A jacking member is arranged between the support structure 1 and the ground. The jacking member jacks up the support structure 1 upwards, thereby realizing the rotation of the support structure 1 around the ground, and the support structure 1 can be rotated from the horizontal state to the vertical state, thereby realizing the installation of the support structure 1.

[0065] Referring toFigure 4 and Figure 5 The jacking member includes a first jacking device 2 and a second jacking device 3, the first jacking device 2 is arranged near the free end of the support structure 1, and the second jacking device 3 is arranged near the hinged end of the support structure 1.

[0066] The way in which the jacking member jacks up the support structure 1 includes the following two embodiments:

[0067] Embodiment one: referring to Figure 4 and Figure 5 First, the first jacking device 2 is installed, and the free end of the support structure 1 is jacked up by the first jacking device 2, so that the support structure 1 is not in contact with the temporary support frame 4, and then the temporary support frame 4 is removed, and the support structure 1 is continuously jacked up by the first jacking device 2, and when the support structure 1 is jacked up and rotated to a certain angle by the first jacking device 2, the second jacking device 3 is installed, and the angle is preferably 45° and not more than 60°.

[0068] Referring to Figure 4 and Figure 5 First, the support structure 1 is jacked up by the first jacking device 2 until the first jacking device 2 can no longer continue to apply force to the support structure 1, and the first jacking device 2 is removed in time. Then, the support structure 1 is jacked up by the second jacking device 3 until the support structure 1 is rotated around the hinged end to the free end of the support structure 1 can be connected to the original steel structure roof 7. Among them, the first jacking device 2 and the second jacking device 3 are both hydraulic lifting equipment.

[0069] Embodiment two: referring to Figure 6 and Figure 7 When jacking up the support structure 1, the temporary support frame 4 is used as the first jacking device 2. Specifically, the temporary support frame 4 includes the inner row construction frame 41 and the outer row construction frame 42 arranged side by side, and the inner row construction frame 41 is closer to the hinged end of the support structure 1 than the outer row construction frame 42. After the free end of the support structure 1 is placed on the top end of the temporary support frame 4, a hydraulic jacking device is installed on the top end of the inner row construction frame 41, and the support structure 1 is jacked up by the hydraulic jacking device until there is a space between the support structure 1 and the top of the outer row construction frame 42; the height of the outer row construction frame 42 is increased, and a hydraulic jacking device is installed on the top end of the outer row construction frame 42, and the support structure 1 is jacked up by the hydraulic jacking device until there is a space between the support structure 1 and the top of the inner row construction frame 41; the height of the inner row construction frame 41 is increased so that the hydraulic jacking device on the top end of the inner row construction frame 41 can jack up the support structure 1 again, and the cycle is repeated to achieve the rotation and lifting of the support structure 1.

[0070] Referring to Figure 8 and Figure 9, when the first jacking device 2 jacks up and rotates the support structure 1 to a position where it is difficult to continue jacking up, the second jacking device 3 is installed between the support structure 1 and the ground, and the first jacking device 2 is removed, and the support structure 1 is jacked up by the second jacking device 3 until the free end of the support structure 1 can be connected to the original steel structure roof 7.

[0071] With reference to Figure 5 and Figure 8 , in the above two embodiments, when the support structure 1 is rotated to a certain limit angle, a bumper device 5 needs to be installed between the side of the support structure 1 away from the ground and the ground, and the limit angle cannot be greater than 60°, and preferably the bumper device 5 is installed when the support structure 1 is rotated to an angle of 45° with the ground. The two ends of the bumper device 5 are respectively hinged to the support structure 1 and the ground, and the bumper device 5 can be a hydraulic rod device.

[0072] Step four, with reference to Figure 9 and Figure 10 , the free end of the support structure 1 is connected to the original steel structure roof 7. The top connector 11 includes a connection part 111, a hinge part and a stress diffusion part 112 arranged in sequence, the connection part 111 is used to connect with the original steel structure roof 7, the hinge part is used to rotate the connection between the stress diffusion part 112 and the connection part 111, and the stress diffusion part 112 is used to be detachably connected and fixed with the main body 13, and the stress at the connection joint between the original steel structure roof 7 and the support structure 1 is uniformly transmitted to the main body 13.

[0073] With reference to Figure 10 , specifically, the connection part 111 includes a force transmission beam 1111, a restraint frame 1112 is arranged on one side wall of the force transmission beam 1111, the restraint frame 1112 is used to connect with the steel member 71 on the original steel structure roof 7, a limiting groove is opened on the restraint frame 1112, and the restraint frame 1112 and the force transmission beam 1111 form a limiting space 8, the steel member 71 is movably arranged in the limiting space 8, so as to realize the effect that the steel member 71 can be moved and limited between the restraint frame 1112 and the force transmission beam 1111, and the restraint frame 1112 can be connected with the force transmission beam 1111 by welding or high-strength bolt connection.

[0074] With reference to Figure 10 , the hinge part includes a first ear plate 113 fixed on the force transmission beam 1111 and a second ear plate 114 fixed on the stress diffusion part 112, the first ear plate 113 and the second ear plate 114 are rotationally connected by a pin shaft, so as to realize the rotational connection between the original steel structure roof 7 and the support structure 1.

[0075] With reference to Figure 10The side wall of the force transmission beam 1111 fixedly connects the constraint frame 1112, and a supporting piece 1115 is further fixed on the side wall of the constraint frame 1112, the supporting piece 1115 is used for supporting the steel member 71, the side wall of the supporting piece 1115 in contact with the steel member 71 matches the shape of the side wall of the steel member 71, and when the supporting structure 1 is connected with the original steel structure roof 7, the steel member 71 at this position of the original steel structure roof 7 abuts against the supporting piece 1115.

[0076] With reference to Figure 10 The elastic piece 1113 is fixed on the side wall of the force transmission beam 1111 away from the constraint frame 1112, the elastic piece 1113 is clamped between the constraint frame 1112 and the steel member 71, and the elastic piece 1113 is further fixed with a gasket 1114 at the end close to the steel member 71, the gasket 1114 is used for abutting against the steel member 71.

[0077] With reference to Figure 10 The supporting piece 1115 can be used to better match the connecting part 111 and the original steel structure roof 7, so that the original steel structure roof 7 can more efficiently and smoothly transmit force to the supporting structure 1, and the supporting piece 1115 can also be used to fix the original steel structure roof 7; the elastic piece 1113 can be used to buffer when the supporting structure 1 moves within the range limited by the force transmission beam 1111 relative to the original steel structure roof 7, so as to reduce the impact between the original steel structure roof 7 and the force transmission beam 1111, thereby reducing the damage between the components.

[0078] The implementation principle of the large-span steel structure roof temporary support construction method is that the supporting structure 1 is transported into the stadium in sections, and then is spliced to form an integrated supporting structure 1; one end of the supporting structure 1 is hinged to the ground, and the supporting structure 1 is lifted upward by the lifting piece, so that the supporting structure 1 rotates around the ground to be rotatably connected with the original steel structure roof 7, thereby achieving the installation of the supporting structure 1, and achieving the temporary support of the cantilevered steel structure roof structure during the reinforcement construction of the stadium by the supporting structure 1. The construction method requires a small mechanical volume and has low requirements for the construction site, and the supporting structure 1 is not easy to damage the original steel structure roof 7 during installation.

[0079] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A method for constructing a temporary support for a long-span steel structure roof, characterized in that: The method comprises the following steps: S1: pre-assemble a support structure (1) on the ground, one end of the support structure (1) is hinged to the ground; S2: lift the free end of the support structure (1) away from the ground; S3: install a jacking member between the side of the support structure (1) close to the ground and the ground, continue to lift the free end of the support structure (1) through the jacking member, and rotate the support structure (1) around the hinged end until the free end of the support structure (1) can be connected with the original steel structure roof (7); S4: hinge and fix the free end of the support structure (1) with the original steel structure roof (7); The original steel structure roof (7) comprises a steel member (71) for connecting with the support structure; The support structure (1) comprises a top connecting head (11) and a bottom connecting seat (12) respectively arranged at two ends, and a main body (13) connecting the top connecting head (11) and the bottom connecting seat (12), a spherical hinge support for hinging with the bottom connecting seat (12) is arranged on the ground, and the top connecting head (11) is rotationally connected with the steel member (71); The top connecting head (11) comprises: a connecting part (111) for detachable connection with the original steel structure roof (7); a stress diffusion part (112) fixedly connected with the main body (13) for uniformly transmitting the stress at the connecting joint to the main body (13); a hinged part comprising a first lug plate (113) fixed on the connecting part (111) and a second lug plate (114) fixed on the stress diffusion part (112), the first lug plate (113) and the second lug plate (114) are rotationally connected.

2. The construction method of temporary support for a long-span steel structure roof according to claim 1, characterized in that: The main body (13) comprises a plurality of standard sections (131), in the S1 step, the top connecting head (11), the plurality of standard sections (131) and the bottom connecting seat (12) are transported to the construction site and sequentially assembled on site to form the support structure (1).

3. The construction method of temporary support for a long-span steel structure roof according to claim 1, characterized in that: In the S2 step, a temporary support frame (4) is first erected on the ground, the free end of the support structure (1) is lifted by a hoisting device and placed on the temporary support frame (4); In the S3 step, the jacking member comprises a first jacking device (2) and a second jacking device (3), the first jacking device (2) is arranged close to the free end of the support structure (1), the second jacking device (3) is arranged close to the hinged end of the support structure (1), and the first jacking device (2) and the second jacking device (3) sequentially lift the support structure (1) until the free end of the support structure (1) is connected with the original steel structure roof (7).

4. The construction method of temporary support for a long-span steel structure roof according to claim 3, characterized in that: In the S3 step, after the first jacking device (2) and the second jacking device (3) are installed, a bumper device (5) is installed between the side of the support structure (1) away from the ground and the ground, and the two ends of the bumper device (5) are hinged to the support structure (1) and the ground, respectively.

5. The construction method of temporary support for a long-span steel structure roof according to claim 1, characterized in that: In the S1 step, a sliding track (6) is fixedly installed on the ground, and the spherical hinge support is slidingly arranged in the sliding track (6), when the bottom connecting seat (12) is rotated to be connected with the ground only through the spherical hinge support, the spherical hinge support is fixed on the sliding track (6).

6. The construction method of temporary support for a long-span steel structure roof according to claim 1, characterized in that: The connecting part (111) comprises a force transmission beam (1111) fixedly connected with the hinged part; one end of the force transmission beam (1111) away from the hinged part is fixed with a constraint frame (1112), the constraint frame (1112) is provided with a limiting groove, and the constraint frame (1112) and the force transmission beam (1111) form a limiting space (8) in a surrounding manner; and the steel member (71) is movably arranged in the limiting space (8).

7. The construction method of temporary support for a long-span steel structure roof according to claim 6, characterized in that: A side wall of the limiting groove away from the force transmission beam (1111) is fixed with an elastic piece (1113), and the elastic piece (1113) is clamped between the constraint frame (1112) and the steel member (71).

8. The construction method of temporary support for a long-span steel structure roof according to claim 7, characterized in that: The force transmission beam (1111) is fixedly provided with a supporting piece (1115), the supporting piece (1115) is used for abutting against the steel member (71), and a side wall of the supporting piece (1115) in contact with the steel member (71) is matched with the side wall shape of the steel member (71).

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