Pre-tensioning self-locking mechanism, rock bolt foundation and construction method thereof
A self-locking and tightening technology, applied in basic structural engineering, construction, etc., can solve the problems of low pull-out bearing capacity, fractured rock mass of joints, displacement creep, etc., so as to improve the pull-out bearing capacity and improve the displacement. Creep, low cost effect
Active Publication Date: 2014-02-12
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0003] However, due to the relatively developed joints and fissures and the relatively broken rock mass of the strongly weathered rock foundation, there are practical problems such as low uplift bearing capacity and displacement creep when rock bolt foundations are used, and there is no effective solution at present.
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[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that representation and description of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the ar...
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The invention provides a pre-tensioning self-locking mechanism, a rock bolt foundation and a construction method thereof. The bottom pre-tensioning self-locking mechanism comprises tension plates, a sliding sleeve and an anchor rib, wherein the tension plates are provided with grooves extending from one side of each tension plate to the other side of each tension plate, and the groove walls of the grooves are far away from one another in the direction where the groove openings point at the groove bottoms; the sliding sleeve is arranged in the grooves and slides along the medial axis, and the outer diameter of the sliding sleeve is larger than the widths of the groove openings; the anchor rib is arranged in the sliding sleeve in a sleeved mode, and a thread of the anchor rib is matched with a thread of the sliding sleeve. The pre-tensioning self-locking mechanism is adopted in the rock bolt foundation. The construction method includes the steps that the pre-tensioning self-locking mechanism is placed into an anchor hole of the rock bolt foundation; the tension plates are fixed, and torque is applied to the anchor rib to drive the sliding sleeve to move upwards and enable the groove openings of the tension plates to be expanded and squeeze surrounding rock walls; the anchor hole is filled with fine concrete and the fine concrete is vibrated to be compact. The uplift bearing capacity of the rock bolt foundation is improved, the displacement and creeping problems in strong-weathered rock application are solved, the principle is simple, cost is low, construction is convenient to achieve and reliability is high.
Description
technical field [0001] The invention relates to the field of power transmission line engineering, in particular to a pre-tensioning self-locking mechanism, a rock bolt foundation and a construction method thereof. Background technique [0002] Rock bolt foundations are suitable for column foundations built directly on bedrock, or for building foundations that bear tension or horizontal forces. In transmission line engineering, the rock anchor foundation is a new type of environment-friendly transmission line foundation that integrates the anchor bar and the rock mass through the cementation of fine stone concrete in the rock hole. It has the advantages of saving the amount of concrete, steel and formwork. The on-site construction workload is small and has significant social and economic benefits. On the one hand, the rock bolt foundation makes full use of the high strength and low deformation characteristics of the rock, and can withstand large vertical tension and pressure...
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IPC IPC(8): E02D27/42
Inventor 满银郑卫锋鲁先龙童瑞铭苏荣臻崔强张琰杨文智侯晓燕
Owner STATE GRID CORP OF CHINA