Anchor cable tensioning method for prestressed concrete lining
A prestressing and concrete technology, applied in the field of anchor cable tensioning of prestressed concrete lining, can solve problems such as unusable, cracks and deformation of prestressed lining, and achieve the effect of improving construction efficiency and saving construction time
Pending Publication Date: 2022-01-07
中铁二十三局集团第四工程有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to provide a prestressed lining for the problems existing in the prior art that directly stretching the anchor cable to the design load will cause cracks, deformation and unusability of the prestressed lining due to stress concentration in the concrete of the prestressed lining. Anchor Cable Tensioning Method for Concrete Lining
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Embodiment 1
[0026] An anchor cable tensioning method for prestressed concrete lining, such as figure 1 As shown, the anchor grooves 6 are evenly distributed in two rows along the axial direction of the prestressed lining 5, and the two rows of anchor grooves 6 are staggered from each other in the axial direction of the prestressed lining 5, and the distance between the anchor grooves 6 of the same row The distance between two adjacent anchor grooves 6 in different rows along the axial direction of the prestressed lining 5 is 500 mm. Both ends of the anchor cable wound along the circumferential direction of the prestressed lining 5 are located in the anchor groove 6 . Put the two rows of anchor grooves 6 according to figure 1 The shown zone is divided into the first tension zone 1, the second tension zone 2, the third tension zone 3, and the fourth tension zone 4; wherein the number of anchor grooves 6 in the first tension zone 1 is the same as that of the fourth tension zone The number ...
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The invention relates to the field of building construction, in particular to an anchor cable tensioning method for a prestressed concrete lining, anchor cables are sequentially and symmetrically pre-tensioned from the middle of the prestressed lining to the two ends of the prestressed lining, the pre-tensioning means that the anchor cables are tensioned to 50% of design load, and after the anchor cables are pre-tensioned, the anchor cables are tensioned to 50% of design load. Starting from the anchorage device groove located in the middle of the prestressed lining and ending from the anchorage device grooves in the two ends of the prestressed lining, the anchor cables in the anchorage device grooves are sequentially and symmetrically tensioned to 100% design load. Through pre-tensioning, the difference between the tensioning forces of the anchor cables in the adjacent anchorage device grooves is controlled within 50%, so that the stress generated by the pre-stressed lining after the anchor cables are pre-tensioned is insufficient, and the pre-stressed lining is damaged due to stress concentration; the anchor cables are sequentially tensioned from the middle of the prestressed lining to the two ends of the prestressed lining, deformation of the prestressed lining can be more symmetrical and uniform, and the situation that the deformed prestressed lining is damaged due to stress concentration is avoided.
Description
technical field [0001] The invention relates to a tunnel construction method, in particular to an anchor cable tensioning method for prestressed concrete lining. Background technique [0002] In water conservancy projects, the tunnel lining used for water diversion will be under the pressure of the water flow. Under the action of the water flow pressure, the tunnel lining will deform and generate internal tensile stress, which will easily cause cracks in the tunnel lining and eventually lead to water leakage in the tunnel. At present, most of the tunnel linings used in water conservancy projects are prestressed concrete linings (to simplify the name, hereinafter referred to as prestressed linings), and there are multiple anchor cables inside the prestressed lining. Distributed and wound along the circumferential direction of the lining, the anchor cable is composed of multiple steel strands, and anchorage grooves are poured on the prestressed lining; after the strength of th...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21D11/10E21D20/00E21D20/02E21D21/00E21D21/02
CPCE21D11/10E21D20/00E21D20/02E21D21/02E21D21/00E21D21/008E21D21/0093
Inventor 钟理炳王连华曾勇霖何华徐东升张栋槟
Owner 中铁二十三局集团第四工程有限公司