Position detection method and detection device of karst cave pile foundation casing

Abstract

The invention discloses a method for detecting the position of a pile foundation casing in a karst cave, which includes the following steps: the first step: prefabricating a ground measuring steel frame with two layers of tempered glass in the center and an in-hole detection frame with a detachable infrared emitter in the center; Step 1: Lower the detection frame in the hole along the pile foundation casing, and the center lines of the two coincide; Step 3: Place a ground measurement steel frame at the entrance of the hole, the tempered glass is horizontal and the center is on the preset center line of the pile foundation; Step 4 : The infrared beam emitted by the infrared emitter stably and vertically upwards is the average distance from the center of the projection point of the two pieces of tempered glass to the center offset of the pile foundation casing; the fifth step: along the parallel or coincident with the center line of the detection frame in the hole The ratio of the horizontal distance between the projected points of the two tempered glasses and the distance between the two tempered glasses of the upwardly emitted external light beam is the inclination of the pile foundation casing. The invention can detect the center position and inclination of any depth of the pile foundation casing, has safe and reliable operation, simple detection device, low cost and fast detection.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction, in particular to a position detection method and a detection device of a karst cave pile foundation casing. Background technique [0002] There are a large number of karst caves of various sizes distributed underground in karst areas. In karst areas with large underground karst caves, bored (impact) cast-in-place piles are used for the construction of bridges or other construction projects. The follow-up method is generally used for construction. That is, immediately after the drilling is formed, the circular protective cylinder is lowered to protect the hole wall. The position and inclination of the pile foundation after construction must be within the preset range, which is an important factor to ensure the quality of the project. In order to prevent obvious deviation and inclination of the final formed pile foundation, drilling equipment is often used to control the posit...

AI Technical Summary

Problems solved by technology

During the construction process, the center position and inclination of the casing have a great influence on the position and inclination of the final pile foundation, so the requirements for the center position and inclination of the casing are relatively high, but at present, the center position and inclination of the pile foundation casing There is no effective detection method

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