Construction method for cooperative tensioning of a prestressed steel beam and a stay cable of a cover beam
A technology of prestressed steel beams and construction methods, which is applied in the direction of cable-stayed bridges, bridges, bridge parts, etc., to achieve the effects of reasonable design, guaranteed verticality of bridge towers, and simple steps
Active Publication Date: 2021-12-03
CHINA RAILWAY FIRST GRP CO LTD +1
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Problems solved by technology
[0004]
The technical problem to be solved by the present invention is to provide a construction method for coordinating tensioning of the prestressed steel strands of the cover beam and the stay cables in view of the deficiencies in the above-mentioned prior art. The method has simple steps and reasonable design, so that the The prestressed steel tendons and the stay cables are stretched in coordination, and the beam body load is concentrated to the spherical joint and transmitted to the center of the cover beam, and then offset with the prestress of the cover beam, so that the structural force is more reasonable, thereby further reducing the deformation of the cover beam and the cover beam. Deformation of the spherical hinge in the center of the girder, unstable posture of the swivel bridge body, and deviation of the verticality of the bridge tower
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[0071] like figure 1 and Figure 5 Shown, the present invention comprises the following steps:
[0072] Step 1. Construction and marking of prestressed steel tendons in the cap beam:
[0073] Step 101, performing cover beam construction on the pier column 1 to form a cover beam 2; wherein, a spherical joint 3 is set at the center of the cover beam 2;
[0074] Step 102, thread the prestressed steel tendons in the cover beam 2, and mark the prestressed steel tendons as the first row of prestressed steel tendons, ..., i-th row of prestressed steel tendons, ... , the first row of prestressed steel tendons; wherein, i and I are both positive integers, and 1≤i≤I, the first row of prestressed steel tendons is close to the top surface of the cover beam 2, I=4;
[0075] Step 103, mark the i-th row of prestressed steel tendons sequentially according to the width direction of the cover beam 2 as the first prestressed steel tendon in the i-th row, ..., the j-th prestressed steel tendon...
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The invention discloses a construction method for cooperative tensioning of a prestressed steel beam and a stay cable of a cover beam. The method comprises the following steps that 1, the prestressed steel beam in the cover beam is constructed and marked; 2, a beam body and a bridge tower are constructed; 3, the stay cable is mounted; and 4, the prestressed steel beams and the stay cables are tensioned cooperatively. The method is simple in step and reasonable in design, so the prestressed steel beams in the cover beam and the stay cables are tensioned in a coordinated mode, a beam body load is concentrated to a spherical hinge to be transmitted to the center of the cover beam and then counteracts the prestress of the cover beam, and the structure stress is more reasonable; problems of deformation of the capping beam, deformation of a central spherical hinge of the capping beam, unstable posture of a swivel bridge body and deviation of perpendicularity of a bridge tower are further reduced.
Description
technical field [0001] The invention belongs to the technical field of cable-stayed bridge construction, and in particular relates to a construction method for co-tensioning prestressed steel tendons of a cover girder and cable-stayed cables. Background technique [0002] At present, in the construction of the prestressed cap girder swivel cable-stayed bridge, considering the cost and progress, the construction of the superstructure is carried out after the construction of the prestressed cap girder is completed, and the tensioning of the cable stays is finally completed, and the construction of the substructure is carried out first. The upper structure construction can complete the construction of the cable-stayed bridge at one time, and the segmental construction can be completed, so it is widely used. However, after the prestressed construction of the cover beam is completed, the load of the superstructure cannot be balanced with the vertical prestress of the cover beam a...
Claims
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IPC IPC(8): E01D21/00E01D11/04E01D19/02E01D19/16E01D101/28
CPCE01D21/00E01D11/04E01D19/02E01D19/16E01D2101/28
Inventor 冯四超赵斌邓富敏徐宏夜卫平顾波杜强沈捷宣鑫鹏林久伟邢僚陈清云
Owner CHINA RAILWAY FIRST GRP CO LTD
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