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Steel bar truss structure resisting downwarping through upper chord jacking device and application of steel bar truss structure

A technology of steel truss and top extension, applied in the direction of structural elements, building components, building structures, etc., can solve problems such as insufficient economy, waste of manpower and material resources, and increased engineering volume.

Pending Publication Date: 2020-10-20
SHANGHAI OPEN STEEL JOIST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the setting of multiple temporary supports is obviously not economical, and in the construction stage, the setting of temporary supports also greatly increases the amount of work, resulting in a waste of manpower and material resources

Method used

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  • Steel bar truss structure resisting downwarping through upper chord jacking device and application of steel bar truss structure
  • Steel bar truss structure resisting downwarping through upper chord jacking device and application of steel bar truss structure
  • Steel bar truss structure resisting downwarping through upper chord jacking device and application of steel bar truss structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 As shown, the present invention proposes a steel bar truss 2 structure that resists downward deflection through an upper chord jacking device 3, including a bottom plate 1, a steel bar truss 2 and a jacking device 3;

[0047]The steel bar truss 2 includes an upper chord bar 21, two lower chord bars 22 parallel to it, and a web steel bar 23 installed between the upper chord bar 21 and the lower chord bar 22; On the surface, the steel bar truss 2 structure is the patent "a U-shaped steel wire binding connected steel bar truss 2 floor deck and floor slab structure", patent authorization publication number: CN 209942003U; in this embodiment, the upper chord bar For solid steel.

[0048] The steel bar truss 2 is arranged on the surface of the bottom plate 1, the upper chord bar 21 of the steel bar truss 2 is interrupted at the mid-span position, and the upper chord bar 21 is interrupted at the position where the jacking device 3 is inserted, such as figur...

Embodiment 2

[0053] Such as Figure 5 and Figure 6 As shown, compared with Embodiment 1, the overall structure is the same, and the same parts will not be described in detail. The distinguishing technical feature is that the upper string rib 21 is different from the structure of the top extension device 3. In this embodiment, the upper string rib 21 adopts a hollow steel pipe, so that The stiffness of the upper chord is greatly increased, which can bear greater loads. Especially the stable bearing capacity under compression, with the same cross-sectional area, the stable bearing capacity of hollow steel pipes is more than 2.5 times higher than that of solid steel bars.

[0054] With the setting of hollow steel pipe, such as Figure 7 As shown, the jacking device 3 is correspondingly modified into a bolt sleeve 31 and a threaded cap 32. The outer surface of one end of the bolt sleeve 31 is provided with external threads, and the inner surface of one end of the threaded cap 32 is provided...

Embodiment 3

[0057] Such as Figure 9 As shown, compared with Embodiment 1 and Embodiment 2, the overall structure is the same, and the difference technology is that the structure of the extension device 3 is different. In this embodiment, the extension device 3 is a threaded cap 33, and the threaded cap 33 is equipped with There are internal threads, and the end surfaces at both ends of the upper string rib 21 are provided with external threads. The threaded cap 33 is inserted into the interrupted position of the upper string rib 21, and through the cooperation between the internal thread and the external thread, the upper string rib 21 The ends at the two ends of the interrupted position are respectively screwed on the two ends of the threaded cap 33; the external threads on the surface of the ends at the two ends of the interrupted position of the upper chord rib 21 are rotated in the opposite direction, and the threaded cap 33 is rotated so that the ends at both ends are reversed. disp...

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Abstract

The invention provides a steel bar truss structure resisting downwarping through an upper chord jacking device and application of the steel bar truss structure. The steel bar truss structure comprisesa bottom plate, a steel bar truss and the jacking device, wherein the steel bar truss is arranged on the surface of the bottom plate; and an upper chord rib of the steel bar truss is broken, the jacking device is inserted into the broken position of the upper chord rib, the steel bar truss drives the bottom plate to arch upwards, the pre-arching function is achieved, the pre-arching height and the lower deflection generated when the steel bar truss bears loads in the later assembling process are offset, and therefore the flatness of the assembled steel bar truss is guaranteed as much as possible, the situation of large-angle downwarping is avoided, and the engineering quality is further guaranteed. The jacking device is simple in structure, low in cost and convenient to assemble.

Description

technical field [0001] The invention relates to the field of building technology, in particular to a steel bar truss structure that resists downward deflection through an upper chord extension device and an application thereof. Background technique [0002] The steel truss system is mostly used in the field of prefabricated buildings. Before assembly, the steel truss system needs to bear its own weight; during the assembly process, the steel truss system needs to bear the load brought by the uncured concrete and the superstructure; In the use stage after assembly, the steel truss system needs to bear some temporary loads on the floors; combined with the general increase of the span of the steel truss itself, no matter in the construction or in use, the deflection of the steel truss will change, often along the The downward deflection occurs in the middle of the span, which affects the structure and force of the project. [0003] For example, the patent "a reinforced truss f...

Claims

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Application Information

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IPC IPC(8): E04C5/06
CPCE04C5/0636
Inventor 陈明
Owner SHANGHAI OPEN STEEL JOIST
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