Integral turning construction method of super-long arc-shaped multi-layer truss

Abstract

The application provides a whole turning-over construction method of an ultra-long arc-shaped multi-layer truss, which comprises the following steps: deforming calculation of an arc-shaped multi-layer truss from a plane to a vertical surface to confirm parameters of temporary reinforcing measures, truss reinforcing, setting of a hoisting point, whole hoisting and turning-over of the truss and the like. The application realizes completion of most of the work tasks on the ground, reduces the amount of high-altitude work of the truss installation, improves the construction quality and the construction safety coefficient; the truss turning-over reinforcing measures made of round pipes and sectional steels make the truss structure stable during the turning-over process, the measure materials can be recycled, material waste is reduced, and the economic cost is lowered; the whole turning-over process of the truss is simple to implement during the on-site installation process, and greatly shortens the installation time of the arc-shaped truss.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure construction, and particularly relates to a whole turning-over construction method of an ultra-long arc-shaped multi-layer truss. BACKGROUND

[0002] At present, truss structures are commonly used in steel structure buildings in China, and most of the truss structures are flat and straight, and in addition, there are some arc-shaped trusses. Compared with the traditional truss construction method of directly turning over and hoisting after ground assembly, the arc-shaped truss has a bending due to its own shape. If the traditional turning-over method is used after the assembly is completed, the stability of the truss will be inevitably affected. Therefore, the hoisting operation of the arc-shaped truss is poor in stability, and there are obvious defects such as difficulty in quality control and safety risks in the hoisting process.

[0003] At present, the ultra-long arc-shaped multi-layer truss is usually installed by ground assembly, segmental turning-over and hoisting. The bending degree of the arc-shaped truss is reduced by segmental shortening, so as to reduce the influence of turning-over and hoisting on the strength and stability of the truss to the maximum extent. However, the construction period of this construction method is long, and due to a large amount of installation operation in the air, the welding and installation operation is difficult, and the engineering quality is difficult to control. In view of the high appearance and construction quality requirements and high construction efficiency requirements of the arc-shaped truss structure at present in China, a whole turning-over construction method of an ultra-long arc-shaped multi-layer truss is developed, which can effectively solve the problem that the stability of the arc-shaped truss cannot be guaranteed during the turning-over and hoisting construction due to the shape problem, improve the installation efficiency of the arc-shaped truss, shorten the construction period, guarantee the installation quality of the arc-shaped truss, and provide a basis for the construction of similar structural trusses. SUMMARY

[0004] In view of the above defects of the prior art, the present application provides a whole turning-over construction method of an ultra-long arc-shaped multi-layer truss, which aims to solve the problems of low turning-over and hoisting efficiency and great difficulty in quality control after the ground whole assembly of the ultra-long arc-shaped truss is completed.

[0005] To achieve the above-mentioned purpose, the present application provides a whole turning-over construction method of an ultra-long arc-shaped multi-layer truss, characterized by comprising the following steps:

[0006] Step S1, after the ground assembly and welding of the truss are completed, the turning-over process of the arc-shaped multi-layer truss from a plane to a vertical surface is calculated for deformation, so as to confirm the reinforcing position, quantity and size of the temporary reinforcing bars;

[0007] Step S2, truss reinforcement: the reinforcing bars are arranged at the 1 / 4 position from the edge to the center of the two ends of the arc-shaped multi-layer truss; the two ends of the reinforcing bars are reinforced by a profile steel to form a profile steel reinforcement measure whole; the profile steel reinforcement measure whole and the truss side vertical surface form a triangular shape;

[0008] Step S3, setting of lifting points: four lifting and hoisting binding points are arranged on the upper chord of the truss, the binding points are arranged at the connection between the upper chord and the web, and the binding points are symmetrically distributed on the center line of the truss; wind ropes are arranged at the two ends of the truss;

[0009] Step S4, overall lifting and turning of the truss: the steel wire rope is connected with the chain hoist and is connected to the binding points, the horizontal angle between the steel wire rope and the chord of the truss needs to be greater than 50°; during the turning construction of the truss, the lower chord always relies on the vertical rods of the jig frame for assembling the truss, so that a stable force point is always ensured at the lower end of the truss;

[0010] Step S5, the truss is turned by 90°, and the turning operation is completed, and subsequent hoisting and welding operations of the truss can be performed.

[0011] Further, in the step S2, the reinforcing rod member includes a reinforcing round pipe at the position of the upper chord, the horizontal through-length reinforcing round pipe is located at the same horizontal plane as the upper chord, and a round pipe horizontal support and a round pipe inclined support are arranged at the middle part to reinforce the round pipe and the vertical structure of the truss.

[0012] Further, in the step S2, the upper chord at the end of the truss and the middle chord are made of the same type of steel, and a steel horizontal support is arranged vertically to the truss; the steel horizontal support is fixedly connected to one end of the steel; the other end of the steel horizontal support and the steel are fixedly connected to the truss, and the connection between the support and the truss is arranged at the connection node between the lower chord of the truss and the web.

[0013] Further, the lengths of the reinforcing rod members and the steel connected to the truss are provided with a surplus amount.

[0014] Further, the type of the reinforcing round pipe is PIP168x10, and the type of the steel is HW200x200x8x12.

[0015] Further, in the step S4, the projection position of the lifting hook is always on the center line of the binding point during the turning operation, and the length of the steel wire rope is adjusted at any time through the chain hoist during the turning process, so that the steel wire rope is kept in a taut and strained state.

[0016] Further, in the step S5, after the turning is completed, the steel reinforcing measures at the two ends of the truss are removed, and subsequent hoisting and welding operations of the truss can be performed.

[0017] Compared with the prior art, the present application has the following advantages or beneficial effects:

[0018] (1) The construction method of the present application realizes most of the operation tasks on the ground, reduces the amount of high-altitude operation of the truss installation, and improves the construction quality and the construction safety factor;

[0019] (2) The construction method of the present application adopts a circular pipe and a section steel as a reinforcing measure for the truss to turn over, which makes the truss structure stable during the turning over process, the reinforcing material can be recycled, material waste is reduced, and economic cost is lowered;

[0020] (3) The construction method of the present application adopts a truss overall turning over process, which is simple to implement during on-site installation, greatly shortens the installation time of the arc-shaped truss, can effectively shorten the construction period, and speeds up the construction progress. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application and its features, shapes and advantages will become more apparent from the following detailed description of non-limiting embodiments, with reference to the accompanying drawings. The same reference numbers in all the drawings indicate the same parts. The drawings are not drawn to scale, the emphasis being on illustrating the principle of the present application.

[0022] Figure 1 Fig. 1 is a perspective view of the truss and reinforcing measure in an embodiment of the present application;

[0023] Figure 2 Fig. 2 is a perspective view of the section steel reinforcing measure in an embodiment of the present application;

[0024] Figure 3 Fig. 3 is a layout of the truss binding points in an embodiment of the present application;

[0025] Figure 4 Fig. 4 is a schematic view of the position of the lower chord during the truss turning over process in an embodiment of the present application;

[0026] Figure 5 Fig. 5 is a schematic view of the side elevation projection during the truss turning over process in an embodiment of the present application;

[0027] Wherein, 1, truss; 2, reinforcing circular pipe; 21, circular pipe horizontal support; 22, section steel horizontal support; 3, section steel; 31, circular pipe inclined support; 4, upper chord; 5, web; 6, lower chord; 7, steel wire rope; 8, binding point; 9, jig stand; 10, center line. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be understood that all of the described exemplary embodiments are merely part of the present application and examples, rather than all. Instead, these exemplary embodiments are provided so that those skilled in the art can more thoroughly understand the present disclosure and more completely convey the technical content of the present disclosure to those skilled in the art.

[0029] It should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; the mode can be welding, or threaded connection, or binding connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Embodiment

[0031] The embodiment provides a whole overturning construction method of an ultra-long arc-shaped multi-layer truss, and has the characteristics that the method comprises the following steps:

[0032] Step S1, after the ground assembling and welding of the truss is completed, the overturning process of the arc-shaped multi-layer truss 1 from a plane to a vertical surface is calculated to confirm the reinforcing positions, quantity and size of the temporary reinforcing members;

[0033] Step S2, truss reinforcement: referring to Figure 1 and Figure 2 , the two ends of the arc-shaped multi-layer truss 1 are provided with the reinforcing members at the 1 / 4 position from the side to the middle; the two ends of the reinforcing members are reinforced to form a whole type steel reinforcing measure by using a type steel 3; the whole type steel reinforcing measure is in a triangular shape with the truss side vertical surface. As a preferred technical solution, more specifically, the reinforcing members comprise a reinforcing circular pipe 2 at the position of the upper chord, the horizontal through-length reinforcing circular pipe 2 is located at the same horizontal plane as the upper chord 4, the same-specification circular pipes are used to add a circular pipe horizontal support 21 and a circular pipe inclined support 31 at the middle position, and the supports are connected to the reinforcing circular pipe 2 and the truss vertical surface structure. Further, the upper chord at the end of the truss and the middle chord are made of the same type of type steel, and a type steel horizontal support 22 is vertically arranged on the truss; one end of the type steel horizontal support 22 and the type steel 3 are fixedly connected by welding or the like; the other end of the type steel horizontal support 22 and the type steel 3 are fixedly connected to the truss 1 by welding or the like, and the connection between the supports and the truss is arranged at the connection node between the lower chord 6 and the web 5 of the truss. Preferably, the type of the reinforcing circular pipe 2 is PIP168x10, and the type of the type steel 3 is HW200x200x8x12. In addition, considering the cutting loss of the subsequent material turnover, the length of each reinforcing member and type steel connected to the truss can also have a surplus amount.

[0034] Step S3, hoisting point arrangement: referring to Figure 3 , four overturning hoisting binding points are arranged on the upper chord of the truss, the binding points are arranged at the connection between the upper chord 4 and the web 5 of the truss, and the binding points are symmetrically distributed on the center line of the truss; wind ropes are arranged at the two ends of the truss;

[0035] Step S4, whole truss lifting and overturning: referring to Figures 3 to 5The steel wire rope 7 is connected with the chain hoist connected to the binding point 8, and the horizontal angle between the steel wire rope and the truss chord needs to be greater than 50 degrees; when the truss is turned over, the lower chord 6 always relies on the truss assembling jig stand 9 to ensure that the lower end of the truss always has a stable stress point. As a preferred technical solution, more specifically: the hook projection position is always on the center line 10 of the binding point 8 during the turning over operation, and the length of the steel wire rope is adjusted at any time during the turning over process by means of the hand-operated hoist to keep it in a tight and strained state.

[0036] Step S5, the truss is turned over by 90 degrees as a whole, that is, the turning over operation is completed, and subsequent hoisting and welding operations of the truss can be carried out. As a preferred technical solution, further: after the turning over is completed, the section steel reinforcing measures at both ends of the truss are removed to reduce the hoisting weight of the truss, and then the subsequent hoisting and welding operations of the truss are carried out.

[0037] From the above construction process, it can be seen that the construction method of the application realizes that most of the work tasks are completed on the ground, improves the construction quality and the construction safety factor; the truss turning over reinforcing measures make the truss structure stable during the turning over process, and the measure materials can be recycled; the truss whole turning over process is simple to implement during on-site installation, greatly shortens the installation time of the arc-shaped truss, and can effectively shorten the construction period.

[0038] In summary, the application provides a whole turning over construction method of an ultra-long arc-shaped multi-layer truss, which includes steps of deforming calculation of an arc-shaped multi-layer truss from a plane to a vertical surface to confirm temporary reinforcing measure parameters, truss reinforcement, lifting point setting, truss whole lifting and turning over, etc. The application realizes that most of the work tasks are completed on the ground, reduces the amount of high-altitude work of truss installation, improves the construction quality and the construction safety factor; the truss turning over reinforcing measures made of round pipes and section steels make the truss structure stable during the turning over process, and the measure materials can be recycled, which reduces material waste and reduces economic cost; the truss whole turning over process is simple to implement during on-site installation, greatly shortens the installation time of the arc-shaped truss.

[0039] In the description of the application, the terms "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and does not require the application to be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the application.

[0040] The preferred embodiments of the present application have been described. It is to be understood that the application is not limited to the above specific embodiments, and that devices and structures not described in detail should be understood to be implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, still belongs to the scope of protection of the technical solutions of the present application.

Claims

1. A method for the overall overturning construction of an ultra-long arc-shaped multi-layer truss, characterized in that: Includes the following steps: Step S1: After the truss ground assembly and welding is completed, the deformation calculation of the arc-shaped multi-layer truss (1) from plane to elevation is carried out to confirm the reinforcement position, quantity and size of the temporary reinforcement members; Step S2, Truss reinforcement: The reinforcement members are installed at the two ends of the arc-shaped multi-layer truss (1) from the edge to the middle 1 / 4 position; the two ends of the reinforcement members are reinforced with steel sections (3) to form a whole steel reinforcement measure; the whole steel reinforcement measure forms a triangular shape with the side facade of the truss; the reinforcement members include a reinforcement round tube (2) at the position of the upper chord, the horizontally continuous reinforcement round tube (2) and the upper chord (4) are located on the same horizontal plane, and the middle part is equipped with a round tube horizontal support (21) of the same specification. And the oblique support of the round tube (31) to support and reinforce the round tube (2) and the truss facade structure; the upper chord and the middle chord of the truss end are made of the same type of steel, and the steel horizontal support (22) is added perpendicular to the truss; the steel horizontal support (22) is fixedly connected to one end of the steel (3); the other end of the steel horizontal support (22) and the steel (3) is fixedly connected to the truss (1), and the connection between the steel horizontal support (22) and the truss is set at the connection node between the lower chord (6) and the web member (5) of the truss; Step S3, Setting up lifting points: Four turning and lifting binding points are set on the upper chord of the truss. The binding points are set at the connection between the upper chord (4) and the web member (5). The binding points are symmetrically distributed on the center line of the truss. Guy ropes are pulled at both ends of the truss. Step S4, overall lifting and turning of the truss: The steel wire rope (7) is connected to the chain hoist and tied at the binding point (8). The angle between the steel wire rope and the horizontal chord of the truss must be greater than 50°. During the truss turning construction, the lower chord (6) always relies on the upright of the truss assembly frame (9) to ensure that the lower end of the truss always has a stable stress point. Step S5: The truss is flipped 90° to complete the flipping operation, which allows for subsequent truss hoisting and welding operations.

2. The method for overall overturning construction of an ultra-long arc-shaped multi-layer truss according to claim 1, characterized in that, The length of the reinforcing members and steel sections connected to the truss has a margin of safety.

3. The method for overall overturning construction of an ultra-long arc-shaped multi-layer truss according to claim 1, characterized in that, The reinforced round pipe (2) is of model PIP168×10; the steel section (3) is of model HW200×200×8×12.

4. The method for overall overturning construction of an ultra-long arc-shaped multi-layer truss according to claim 1, characterized in that, In step S4, the hook projection position is always on the center line (10) of the binding point (8) during the turning operation. During the turning process, the length of the wire rope is adjusted at any time by the hand hoist to keep it taut and under stress.

5. The method for overall overturning construction of an ultra-long arc-shaped multi-layer truss according to claim 1, characterized in that, In step S5, after the overturning is completed, the steel reinforcement measures at both ends of the truss are removed, and then the subsequent hoisting and welding operations of the truss are carried out.

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