A kind of pile bottom karst cave sonar detection device and method

Abstract

The invention discloses a pile bottom cave sonar detection device and method. The signal output end of a three-dimensional electronic compass it connected with the compass signal input end of a single-chip microcomputer. The signal input end of a sonar stress wave driving module is connected with the signal output end of the single-chip microcomputer. The stress wave driving signal output end of the sonar stress wave driving module is connected with a sonar stress wave transmitter. A sonar stress wave receiving sensor is connected with the sonar signal input end of the single-chip microcomputer through a sonar stress wave signal processing module. The communication end of the single-chip microcomputer is connected with an on-site host through a communication cable. A sonar detection probe is perpendicular to the bottom of a pile. The pile bottom cave sonar detection device and method, which are provided by the invention, can carry out detailed karst cave or weak rock detection on an area below the pile bottom, and can accurately determine whether a karst cave or weak rock is in a pile bottom detection range, wherein the karst cave or the weak rock influences the bearing capacity of the pile bottom.

Description

technical field [0001] The invention relates to the technical field of geophysical sonar detection, in particular to a sonar detection device and detection method for karst caves at the bottom of piles. Background technique [0002] At present, the detection of karst caves at the pile bottom is mainly to carry out geological exploration drilling with a small diameter (generally 5 to 10 mm) at the pile hole position, and drill to about 5 meters below the design position of the pile bottom. When the drill hole 8 does not encounter the karst cave 9, it is considered There is no cave at the bottom of this pile, such as figure 1 shown. However, the places where karst caves are produced are all limestone areas. Limestone is very easy to dissolve, and the forms of dissolution are complex and diverse. Karst caves, there are often cases where one side of the pile bottom is rock and the other side is cave or soil (when the cave exists under the pile hole but not directly under the p...

AI Technical Summary

Problems solved by technology

However, the places where karst caves are produced are all limestone areas. Limestone is very easy to dissolve, and the forms of dissolution are complex and diverse. Karst caves, there are often cases where one side of the pile bottom is rock and the other side is cave or soil (when the cave exists under the pile hole but not directly under the pile hole, it will appear when drilling in the center of the pile hole for karst cave detection The case where the cave that exists under the pile hole cannot be detected

If there is a small part of soil layer at the bottom of the pile hole, and most of it is rock formation, drilling and karst cave detection in the center of the pile hole will also cause the situation that the small part of the soil layer at the bottom of the pile hole cannot be detected), if If the karst cave at the bottom of the pile is not discovered in time, the bearing capacity of the pile foundation will be greatly reduced, and the buildings will fall unevenly or the buildings will tilt and fall, causing great losses to people's lives and property

[0003] At present, some manual excavation piles have carried out some geophysical detection methods, such as ground radar and seismic method, because the inspectors can reach the bottom of the pile, and have achieved some application effects; however, most of the current pile holes are rotary drilling or impact The hole is filled with mud and slurry, and personnel cannot reach the bottom of the pile for detection; therefore, it is impossible to better detect the bottom of the pile, resulting in a difficult problem of karst caves at the bottom of the pile

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