A method for installing a spatially prestressed steel structural purlin

Abstract

The application discloses a kind of spatial prestressed steel structure purlin installation methods, comprising the following construction steps: (1) erect support system, block or segmented hoist prestressed structure rigid roof cover;(2) timely installation purlin structure along with rigid roof cover, purlin structure is temporarily fixed on rigid roof cover;(3) installation prestressed structure cable system;(4) after installing roof cover, purlin and cable system, start cable tensioning construction to structure shaping;(5) remove support system, and the temporary fixed end of purlin structure is connected fixed on structure according to design requirement, complete spatial prestressed structure purlin installation.In the application, purlin structure is installed integrally with main structure first, which solves the technical problem that existing spatial prestressed steel structure purlin needs to be installed after tensioning construction is completed.The method utilizes the force characteristics of purlin structure itself, and is simple in measures, convenient in operation and high in construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building steel structure construction, in particular to a space prestressed steel structure purlin installation method. BACKGROUND

[0002] With the vigorous development of today's building structure, prestressed steel structure is more and more applied because it can realize large span, has the advantages of stable stress and small steel quantity. Purlin structure, as a supporting system of prestressed steel structure metal roof, is usually arranged above the main structure and below the metal roof.

[0003] For large space structures, it is difficult to model the purlin structure due to the large number of purlin structure members, and the structure model needs to be continuously adjusted and optimized during the design stage. Therefore, the purlin structure is generally designed as an independent accessory component, and only the load transmitted by the roof to the purlin is considered. This design process of the purlin generally requires the purlin structure to be installed after the main structure is formed as a whole. When the purlin structure is installed together with the main structure, especially for space prestressed steel structures that require tensioning construction, a rigid surface is formed on the surface of the main structure, which changes the stiffness of the main structure and affects the internal force of the tensioning member, the displacement of the structure and the tensioning cable force. In addition, the purlin participates in the tensioning forming of the main structure, which causes the purlin structure to bear additional load and stress, and even exceeds the specification requirements, which brings safety risks.

[0004] If the purlin structure is installed after the completion of the main structure construction, it will seriously affect the progress of the project construction. At the same time, due to the limitation of the installed main structure, the purlin structure installation will have the characteristics of large installation radius, high installation height, etc. Even if the purlin structure is very light, it also needs to be hoisted and constructed by large machinery. Even if part of the project has a tower crane, the installation of the purlin structure will also cause long use period of the tower crane, high construction machinery cost and more high-altitude work. SUMMARY

[0005] To solve the above technical problems of the prior art, the present application provides a space prestressed steel structure purlin installation method, which installs the purlin structure together with the main structure first, solving the technical problem that the purlin of the existing space prestressed steel structure needs to be installed after the tensioning construction is completed. This method utilizes the stress characteristics of the purlin structure itself, is simple in measures, convenient in operation and high in construction efficiency.

[0006] To achieve the above purpose, the present application adopts the following technical solution: a space prestressed steel structure purlin installation method, comprising the following construction steps:

[0007] (1) erect a support system, and hoist the prestressed structure rigid roof in blocks or segments;

[0008] (2) Install purlin structure along with rigid roof in time, and temporarily fix the purlin structure on the rigid roof;

[0009] (3) Install prestressed structure cable system;

[0010] (4) After the completion of the roof, purlin and cable system, start the cable tensioning construction until the structure is formed;

[0011] (5) Remove the support system, and connect the temporary fixing end of the purlin structure to the structure according to the design requirements, and complete the installation of the purlin structure of the space prestressed structure.

[0012] When the purlin structure is installed along with the main structure, if the main structure is hoisted in blocks, the purlin is assembled together with the main structure on the ground and hoisted integrally; if the main structure is hoisted in sections, the purlin structure is inserted and constructed along with the main structure.

[0013] Further, the purlin structure is temporarily fixed on the rigid roof, which prevents the purlin from forming a rigid surface on the upper part of the structure. Through finite element analysis, the rigid surface formed by the purlin structure is mainly subjected to axial load. During installation, one end of the purlin structure is connected and fixed according to the original design node, and the other end is temporarily fixed by restraining vertical displacement and releasing axial horizontal displacement, so that the purlin does not generate axial load during the entire installation and tensioning process of the structure.

[0014] Further, the temporary fixing of the purlin structure adopts different measures according to the connection node. For the welded connection node, the vertical displacement is restrained by a clamping plate, and the axial horizontal displacement is released by setting a welding gap. For the bolted connection node, the long round hole connection end is selected as the temporary fixing end of the purlin, the vertical displacement is restrained by not tightening the bolt, and the axial horizontal displacement is released. For the bottom support welded connection node, the temporary fixing is performed by a wire hoop, and the axial horizontal displacement is released.

[0015] Further, when selecting the temporary fixing end of the purlin structure, the fixing ends of the adjacent span purlins are arranged on the same axis, which facilitates the final fixing operation of the workers in the later stage.

[0016] Further, the final fixing of the temporary fixing end of the purlin structure needs to be performed after the overall tensioning of the cable is completed. After the tensioning is completed, the structure rigid roof is not actively separated from the support system, and the purlin structure needs to be finally fixed after the support system is unloaded.

[0017] The present application has the following advantages:

[0018] (1) The purlin installation method of the present application effectively avoids the problems of long construction period, high installation cost and much high-altitude operation caused by purlin tensioning construction;

[0019] (2) The purlin structure of the present application can be integrally constructed along with the main structure, which is simple in construction operation and high in construction efficiency;

[0020] (3) The temporary fixing measure of the purline structure is simple in structure and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figures 1-4 is the installation method flow chart of the present application;

[0022] Figures 5-7 is the temporary fixing measure diagram of the purline for different connection nodes of the present application.

[0023] Legend: 1, rigid roof; 2, support system; 3, purline structure; 4, cable tension system. DETAILED DESCRIPTION

[0024] Reference Figures 1 to 7 The specific embodiment of the space prestressed steel structure purline installation method of the present application is further described.

[0025] A space prestressed steel structure purline installation method, the specific construction steps are as follows:

[0026] (1) The support system 2 is erected, and the prestressed structure rigid roof 1 is hoisted in blocks or segments;

[0027] (2) The purline structure 3 is timely installed along with the rigid roof 1, and the purline structure 3 is temporarily fixed on the rigid roof 1, as shown in Figure 1 ;

[0028] (3) The prestressed structure cable tension system 4 is installed, as shown in Figure 2 ;

[0029] (4) After the installation of the roof, the purline and the cable tension system is completed, the cable tension construction is started until the structure is formed, as shown in Figure 3 ;

[0030] (5) The support system is removed (as shown in Figure 4 ), and the temporary fixing end of the purline structure 3 is connected and fixed on the structure according to the design requirements, and the space prestressed structure purline installation is completed.

[0031] When the purline structure 3 is installed along with the main structure, if the main structure is hoisted in blocks, the purline can be assembled together with the main structure on the ground and hoisted integrally; if the main structure is hoisted in segments, the purline structure can be inserted and constructed along with the main structure.

[0032] The purlin structure 3 is preferably temporarily fixed on the rigid roof 1, which prevents the purlin from forming a rigid surface on the upper part of the structure, and through finite element analysis, the rigid surface formed by the purlin structure is mainly subjected to axial load. During installation, one end of the purlin structure is connected and fixed according to the original design node, and the other end is temporarily fixed by restraining vertical displacement and releasing axial and horizontal displacement, so that the purlin does not generate axial load during the entire installation and tensioning process of the structure.

[0033] The purlin structure 3 is preferably temporarily fixed on the rigid roof 1, which prevents the purlin from forming a rigid surface on the upper part of the structure, and through finite element analysis, the rigid surface formed by the purlin structure is mainly subjected to axial load. During installation, one end of the purlin structure is connected and fixed according to the original design node, and the other end is temporarily fixed by restraining vertical displacement and releasing axial and horizontal displacement, so that the purlin does not generate axial load during the entire installation and tensioning process of the structure. Figure 5 As shown in the figure, for the welded connection node, the vertical displacement is restrained by the clamping plate, and the axial and horizontal displacement is released by the welding gap. Figure 6 As shown in the figure, for the bolted connection node, the long round hole connection end is selected as the temporary fixing end of the purlin, the vertical displacement is restrained by the bolt, and the axial and horizontal displacement is released. Figure 7 As shown in the figure, for the bottom support welded connection node, the temporary fixing is performed by the wire hoop, and the axial and horizontal displacement is released.

[0034] The purlin structure 3 is preferably temporarily fixed on the rigid roof 1, which prevents the purlin from forming a rigid surface on the upper part of the structure, and through finite element analysis, the rigid surface formed by the purlin structure is mainly subjected to axial load. During installation, one end of the purlin structure is connected and fixed according to the original design node, and the other end is temporarily fixed by restraining vertical displacement and releasing axial and horizontal displacement, so that the purlin does not generate axial load during the entire installation and tensioning process of the structure.

[0035] The purlin structure 3 is preferably temporarily fixed on the rigid roof 1, which prevents the purlin from forming a rigid surface on the upper part of the structure, and through finite element analysis, the rigid surface formed by the purlin structure is mainly subjected to axial load. During installation, one end of the purlin structure is connected and fixed according to the original design node, and the other end is temporarily fixed by restraining vertical displacement and releasing axial and horizontal displacement, so that the purlin does not generate axial load during the entire installation and tensioning process of the structure.

[0036] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the scope of the present application should be considered within the protection scope of the present application. It should be noted that some improvements and modifications made by ordinary technical personnel in the technical field without departing from the principles of the present application should also be considered within the protection scope of the present application.

Claims

1. A method of installing a spatially prestressed steel structural purlin, characterized in that, The construction steps include: (1) erecting a support system, hoisting the prestressed rigid roof structure in blocks or segments; (2) installing purlin structures in time along with the rigid roof, and temporarily fixing the purlin structures on the rigid roof; (3) installing a prestressed structure cable system; (4) after the completion of the installation of the roof, purlin and cable systems, starting the cable tensioning construction until the structure is formed; (5) removing the support system, and connecting and fixing the temporary fixing end of the purlin structure on the structure according to the design requirements to complete the installation of the purlin of the spatial prestressed structure; The temporary fixing of the purlin structure on the rigid roof is to prevent the formation of a rigid surface of the purlin structure on the upper part of the structure. Through finite element analysis, the rigid surface formed by the purlin structure is mainly subjected to axial load. During installation, one end of the purlin structure is connected and fixed according to the original design node, and the other end is temporarily fixed by restraining the vertical displacement and releasing the axial horizontal displacement, so that the purlin structure does not generate axial load during the entire installation and tensioning process. The temporary fixing of the purlin structure uses different measures according to the connection nodes. For the welded connection node, the vertical displacement is restrained by a clamping plate, and the axial horizontal displacement is released by a welding gap. For the bolted connection node, the long round hole connection end is selected as the temporary fixing end of the purlin structure, the vertical displacement is restrained by not tightening the bolt, and the axial horizontal displacement is released. For the bottom support welded connection node, the temporary fixing is performed by a wire hoop, and the axial horizontal displacement is released.

2. The method of installing a spatially prestressed steel structural purlin according to claim 1, characterized in that: When selecting the temporary fixing end of the purlin structure, the temporary fixing ends of adjacent purlin structures are arranged on an axis, which facilitates the final fixing operation of workers in the later stage.

3. The method of installing a spatially prestressed steel structural purltin according to claim 1, characterized in that: The final fixing of the temporary fixing end of the purlin structure needs to be performed after the overall tensioning of the cable is completed. After the tensioning is completed, the structure rigid roof is not actively separated from the support system, and the purlin structure needs to be finally fixed after the support system is unloaded.

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