Method for reverse pull detection of prestressing force under anchor of anchor cable
A technology of under-anchor prestress and detection method, which is applied in tension measurement and other directions, and can solve the problems of inability to detect the under-anchor prestress, no reliable detection method, and low survival rate
Inactive Publication Date: 2010-04-07
CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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Problems solved by technology
[0005] What is the actual tension provided by the anchor cable, is the construction tension in place, and is the prestress lost or overloaded after a period of operation? This problem has been puzzling the anchoring engineering field, and there is no reliable detection method at present
However, if there is no pre-embedding in the construction stage, it is impossible to detect the size of the prestress under the anchor
Moreover, the cost of pre-embedded force sensors is relatively high, and it is difficult to bury them in large quantities. The survival rate of general sensors is also relatively low, and it is difficult to be effective for a long time.
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[0019] figure 1 It is a block diagram of the principle of the present invention, figure 2 is a two-dimensional coordinate diagram of tensile displacement and tension, image 3 It is a schematic diagram of the structure of the device of the present invention, as shown in the figure: the anti-pull detection method of the prestressed anchorage of the anchor cable in this embodiment includes the following steps:
[0020] a. Apply a pulling force to the exposed section of the anchor cable opposite to the prestressed direction under the anchor, collect and record the tensile displacement value and the tensile force value, and apply the pulling force to the exposed section of the anchor cable through the through-hole hydraulic jack 1, which has a simple structure ,low cost;
[0021] The exposed section 31 of the anchor cable 3 passes through the through-hole hydraulic jack 1 and is fixedly connected with the piston 11 of the through-hole hydraulic jack 1 through the clamp 4, and t...
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The invention discloses a method for the reverse pull detection of a prestressing force under an anchor of an anchor cable. In the method, a pulling force opposite to the direction of the prestressing force of the anchor is adopted, a tensile displacement-pull-up curve is established in a two-dimensional coordinate system, a process of slope changes of the curve is analyzed, a pull force is applied continuously if the slope is stable, and the numerical value of the pulling force corresponding to a catastrophe point on the curve is determined as a numerical value of the prestressing force under the anchor if the slope is suddenly reduced. The method can accurately measures the numerical value of the prestressing force under the anchor by adopting an external reverse pull method and utilizing the characteristics of the prestressing force on the basis of the relationship between the tensile displacement and the pulling force and has a great significance for the control of the construction quality of a newly constructed anchoring engineering and the master of the operation state and safety of the prior anchoring engineering.
Description
technical field [0001] The invention relates to a civil engineering detection method, in particular to a reverse pull detection method of the prestress under the anchorage of an anchor cable. Background technique [0002] Prestressing techniques such as anchor cables have been widely used in civil engineering. For example, it is used for slope reinforcement, bridge prestressed concrete, tunnel and underground engineering reinforcement and deformation control, structure stability, etc. [0003] Prestressed projects such as anchor cables are not only used more and more, but also directly related to the safety and stability of the project. Prestressing such as anchor cables is a project that actively applies prestress, and the safety and stability of the project depends to a large extent on the reinforcement of anchor cables. [0004] The prestress under the anchor refers to the tension of the anchor cable, that is, the actual tension value of the prestressed anchor cable. F...
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IPC IPC(8): G01L5/04
Inventor 罗斌唐树名徐宏武饶枭宇廖强
Owner CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST