In-hole dual-frequency ground penetrating radar antenna

Abstract

The invention relates to an in-hole dual-frequency ground penetrating radar antenna, which is arranged in a reserved hole of a foundation pit support structure for detecting diseases of the foundation pit support structure. The in-hole dual-frequency ground penetrating radar antenna comprises a casing, a casing bottom sealing block, a casing top sealing block, a coaxial cable, and a top antenna polaron and a bottom antenna polaron arranged inside the casing oppositely, wherein each antenna polaron comprises a conical antenna head, a first antenna joint, a variable frequency joint and a second antenna joint connected sequentially; the head part of the coaxial cable is respectively connected with the conical antenna head of each antenna polaron, and the tail is connected with the casing top sealing block. Compared with the prior art, the in-hole dual-frequency ground penetrating radar antenna has the advantages of high central frequency, high resolution, small size, simple operation, variable operation, high material strength, light weight, simple manufacturing and processing, low cost and the like.

Description

technical field [0001] The invention relates to a radar antenna, in particular to a dual-frequency ground-penetrating radar antenna in a hole. Background technique [0002] In recent years, the in-depth development of urban functions has gradually shifted to the large-scale and in-depth development and utilization of underground spaces, such as rail transit hub stations, major projects across rivers, and underground spaces of high-rise buildings. In the construction of underground engineering, the enclosure structure of foundation pit is the key carrier to ensure the safety and environmental safety of underground engineering. Unforeseen unfavorable factors will affect the quality of the foundation pit enclosure structure to a large extent. The enclosure structure often has serious quality defects such as voids, mud inclusions, cracks, segregation, and insufficient length of the enclosure structure, resulting in water leakage, quicksand, support cracking, and even water and ...

AI Technical Summary

Problems solved by technology

[0006] 3. Antenna size

[0007] The Chinese patent whose patent No. is CN102354794B discloses a kind of omnidirectional cylindrical dipole antenna for underground geological exploration mine. The monopole antenna composed of the loading resistance between the antenna sections and in the seat holes at both ends of the antenna sections and the corresponding pressure spring, the intersegment fixing sleeve, the support tube, the nut sleeve, the connection fixing sleeve, the coaxial cable, the The center frequency of the antenna is only 100MHz, and the frequency cannot be converted, which limits the detection range. The structure is complex, the cost is high, and the volume is large. It can only be applied to the underground and not to the foundation pit enclosure structure.

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