Dismounting and mounting method capable of completely dismounting expansion bolt

Abstract

The invention provides a dismounting and mounting method capable of completely dismounting an expansion bolt. The problem that expansion bolts cannot be dismounted after being assembled is solved. The expansion bolt comprises a screw. A fastening threaded rod is arranged at the small end of the screw. A conical-table dovetail column is arranged at the big end of the screw. An expansion threaded section is arranged on a rod body. An inner sleeve is connected with the periphery of the screw in a sleeving mode. A plurality of inner tail grooves which divide the tail end of the inner sleeve into a plurality of inner expansion strips are formed in the tail end of the inner sleeve. An assembly threaded section is arranged on the inner circumferential wall of the inner sleeve. The assembly threaded section is in threaded fit with the expansion threaded section. A plurality of inner pulling holes are formed in the head end of the inner sleeve. An outer sleeve is connected with the periphery of the inner sleeve in a sleeving mode. A plurality of outer tail grooves which divide the tail end of the outer sleeve into a plurality of outer expansion strips are formed in the tail end of the outer sleeve. A plurality of outer pulling holes are formed in the head end of the outer sleeve. The expansion bolt further comprises a fastening cover. The fastening cover is connected with the head end of the outer sleeve, the head end of the inner sleeve and the head end of the screw in a sleeve mode. The fastening threaded rod of the screw is sleeved with a nut in a connected mode. The expansion bolt can be completely dismounted, so that the restoration completeness is improved and the restoration service life is prolonged.

Description

[0001] This application is a divisional application with the application number 201410525527.6, the application date of October 9, 2014, and the title of the invention "a fully detachable expansion bolt and its disassembly method". technical field [0002] The invention belongs to the technical field of building installation components, and is suitable for fixing templates or brackets of concrete structure repair projects in underwater or tidal environments, in particular a method for disassembling and assembling completely removable expansion bolts. Background technique [0003] Conventional expansion bolts use the wedge-shaped structure at the end, and through the relative movement of the screw and the casing, the wedge-shaped support opens the bottom of the casing to achieve effective contact between the casing and the hole wall of the structure, thereby improving the pull-out resistance of the screw. [0004] However, due to the serious deformation of the extruded end of ...

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Problems solved by technology

[0004] However, due to the serious deformation of the extruded end of the sleeve, it cannot be taken out normally, and the diameter of the smallest circumscribed circle of the wedge at the end of the screw is larger than the inner diameter of the sleeve before deformation. Just because the sleeve cannot be taken out, the screw cannot be taken out directly.

In the past, when repairing the surface of concrete structures that are underwater or affected by tides, it is necessary to fix the formwork on the surface. Fixing with expansion bolts is the most common and convenient method, and the amount of expansion bolts is often relatively large, but conventional expansion Bolts cannot be removed after use

The gap between the screw and the casing cannot be effectively sealed. Although the concrete structure is the repaired defect area, some passages for external erosive media to invade the interior of the structure have been created during the repair process.

[0005] Since expansion bolts are the most common and easiest way to install formwork when repairing local defects in concrete, it is very necessary to develop an expansion bolt that can be removed smoothly after use to make up for the problems caused by the inability to remove the existing expansion bolts

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