Construction method of single-stride large cantilever double-pre-stress concrete steel concrete crossbeam

A technology of prestressed steel bars and stiffened steel bars, applied in the direction of girders, joists, truss beams, etc., can solve the problems of large amount of concrete used in single beams and affect the architectural effect, and achieve the effect of reducing sagging deflection and facilitating the promotion and implementation

Inactive Publication Date: 2008-01-23
CHINA CONSTR SEVENTH ENG DIVISION CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the amount of single-beam concrete is too large, and such a large section will also affect the architectural effect

Method used

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  • Construction method of single-stride large cantilever double-pre-stress concrete steel concrete crossbeam
  • Construction method of single-stride large cantilever double-pre-stress concrete steel concrete crossbeam
  • Construction method of single-stride large cantilever double-pre-stress concrete steel concrete crossbeam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: Referring to Figure 1-Figure 12-2, the construction method of single-span large cantilever double prestressed reinforced concrete girder is as follows (Figure 1 is a process flow chart):

[0049] 1 Installation of steel structure

[0050] (1) The steel structure is manufactured in the factory and transported to the site by a trailer.

[0051] The steel bars pass through the holes of the steel structure, which are designed in advance and processed in the factory.

[0052] (2) Hoisting by crane, welding and calibration on site.

[0053] (3) Tighten the anchor bolts.

[0054] 2 Bonded prestressed construction methods and key points of operation

[0055] 2-1 The metal bellows 5 and the prestressed beam 2 are pierced in the frame beam

[0056] (1) After the bottom formwork of the frame beam is supported and the ordinary steel bars are in place, prestressed positioning brackets are installed according to the design requirements, and the spacing is determined...

Embodiment 2

[0121] Embodiment 2: Refer to Fig. 1-Fig. 14-3, the numbering is the same as that of Embodiment 1, and the meaning is the same. The process is the same as that of Embodiment 1 and will not be repeated. The difference is: on the beam H-shaped steel 3 along the direction of the flange At the same time, the bonded stress tendon 2 and the unbonded stress tendon 1 are stretched.

[0122] For example: China Jiyuan Basketball City Gymnasium has a total construction area of ​​20200m 2 , the plane projection diameter is 136.40m, and the building height is 28m. The roof of the competition hall in the middle is a 100m regular quadrangular pyramid double-layer spiral ball node spherical reticulated shell with a horizontal projection. The shape of a flying butterfly. The plan view of the prestressed beam structure on the first floor is shown in Figure 2. According to the requirements of architectural design, a special-shaped reinforced concrete frame is set around, as shown in Figure 3, ...

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Abstract

The invention relates to a construction method for a summer beam of single span, big cantilever and doubly-pre-stressed stiff reinforced concrete, which comprises making steel structure, installing steel structure, installing bottom formwork for strutbeam, accepting concealed works, casting concrete, curing and dismantling side formwork, tensioning pre-stressed rib, and dismantling the bottom formwork. The steel structure is KZ column H-steel fixed with beam H-steel, ordinary rebars pass through or are welded by drilling holes with KZ column H-steel fixed with beam H-steel; at the installation of the bottom formwork for strutbeam and accepting concealed works, doubly-pre-stressed rebars are arranged, made and fixed along the beam H-steel; the making of the double-pre-stressed rebars comprises the bond pre-stress tensioning and no-bond pre-stress tensioning, the casting concrete after that, and the bond pre-stress tensioning and no-bond pre-stress tensioning of rebar tensioning after the concrete reaches to the tensioning strength, and the mortar pouring in holes of the bond pre-stressed rebars and the closing of the anchors at the tensioning ends after the double pre-stress tensioning. The method meets the requirement on deflection and cracking resistance for beams of reinforced concrete in small sections and big spans; and for beams of reinforced concrete in big cantilever, the method can reduce sagging deflection. The method is very worthy of popularizing.

Description

1. Technical field: [0001] The invention relates to a construction method of a large-span prestressed beam, in particular to a construction method of a single-span large cantilever double-prestressed stiffened reinforced concrete girder. 2. Background technology: [0002] Single-span large cantilever prestressed reinforced concrete beams belong to the category of reinforced concrete structures. Prestressed reinforced concrete structures are widely used in various building structures, such as railway bridges, highway bridges, building beams with large spans, and light rail traffic bridge span structures. In order to meet the deflection and crack resistance requirements of reinforced concrete beams with small sections and large spans, it is difficult to complete only by prestressed reinforced concrete structures or only by stiffened reinforced concrete structures. Sometimes it is necessary to add prestressed reinforced concrete structures on the basis of stiffened reinforced co...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): E04G21/00E04C3/02
Inventor焦安亮翟国政盛文考聂意江张银竹覃事选黄延铮邢栓李海建
OwnerCHINA CONSTR SEVENTH ENG DIVISION CORP LTD