Construction method of cantilever cast-in-place beam side-span closing section steel strand
A construction method and technology of steel strands, which are applied in construction, bridge, bridge construction and other directions, can solve the problems of difficult quality control, high economic cost of construction technology, low work efficiency, etc., and achieve high construction efficiency, simple and convenient construction, Effects and small changes
Active Publication Date: 2021-03-12
CCCC SHEC FOURTH ENG +1
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Problems solved by technology
[0005] The present invention aims to provide a construction method for cantilever cast-in-place girder side-span closing section steel strands to solve the problems of high economic cost, difficult quality control and low work efficiency in the existing side-span closing section prestressed steel strand construction process
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[0029] see figure 1 , this embodiment proposes a cantilever cast-in-place beam side-span closing section steel strand construction method, during the construction of the side-span cast-in-place section, the steel strand at the P anchor position (anchor end of the steel strand) is threaded in advance Bury, and reserve the steel strands passing through the closing section and the cantilever section; wrap the exposed parts of the steel strands with colored strips for protection, and place the unexpanded steel strand coils on the ground or in the cast-in-place section of the side span , and perform padding and covering treatment on the steel strand reel to prevent corrosion of the steel strand; the bellows at the position of the side-span cast-in-place section and the cantilever section are respectively provided with exposed reserved bellows; in this embodiment, the exposed pre- The length of the bellows is 15-20cm;
[0030] During the construction of the side-span closing sectio...
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The invention relates to the field of bridge construction. The problems that an existing side span closure section prestress steel strand construction process is high in economic cost and large in quality control difficulty are solved. The invention provides a cantilever casting cast-in-place beam side span closure section steel strand construction method, which comprises the following steps of: during side span cast-in-place section construction, threading and burying a steel strand at a P anchor position in advance, and reserving a steel strand penetrating through a closure section and a cantilever section, respectively arranging exposed reserved corrugated pipes at the positions of the side span cast-in-place section and the cantilever section of the corrugated pipe, during constructionof the side span closure section, threading the reserved steel strands in place, meanwhile, enabling the longitudinal corrugated pipe installed on the closure section to be in lap joint with the reserved corrugated pipe during construction of the cast-in-place section and the cantilever section, and densely winding the lap joint position with adhesive tape, and after corrugated pipe constructionis completed, arranging supplementary grouting pipes on the two sides of the joint surface of the closure section. The construction method has the beneficial effects that construction is easy and convenient, the influence and modification on the bridge structure are small, and the situation that the bridge structure is damaged is avoided.
Description
technical field [0001] The invention relates to the field of bridge construction, in particular to a steel strand construction method for cantilever cast-in-place beam side-span closure sections. Background technique [0002] At present, the construction of prestressed steel strands in the side-span closing section of cantilever cast-in-place beams mainly adopts the method of changing the anchorage end of some steel strands in the straight section of the side-span to use tension-end anchors, and bring the same type of tension-end anchors when tensioning And clips, the structure still adopts single-end tension, and the tension property remains unchanged. After replacing with the tension end anchorage, the tension end anchorage and the reserved notch are installed during the construction of the closing section, and the steel strand is stretched through the bundle after the side span is closed. [0003] The main problem of this process is to change part of the P-anchor of the ...
Claims
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IPC IPC(8): E01D21/10
CPCE01D21/10
Inventor 杨帆孙立军余其鑫韩治忠
Owner CCCC SHEC FOURTH ENG