Anchoring rod length detection auxiliary device and anchoring rod structure
By installing a polyethylene concave end cap at the rock-entry end of the anchor bolt, a strong reflected wave is generated by utilizing the difference in material wave impedance, which solves the problems of accuracy and efficiency in anchor bolt length detection and enables rapid and accurate anchor bolt length determination.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-24
AI Technical Summary
In existing technologies, it is difficult to accurately detect the length of anchor bolts, especially when the anchor bolt ends are grouted tightly, resulting in weak reflected wave signals, which leads to large detection errors and low efficiency.
A concave end cap made of polyethylene is installed at the rock-entry end of the anchor bolt. The difference in wave impedance between the materials generates a clear reflected wave at the interface, ensuring that the stress wave produces a clear echo signal.
By creating an interface with a significant difference in wave impedance at the end of the anchor bolt, the length of the anchor bolt can be detected quickly and accurately, avoiding complex analysis and improving detection efficiency and accuracy.
Smart Images
Figure CN224552341U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anchor bolt quality inspection technology, and in particular to an auxiliary device for anchor bolt length inspection and an anchor bolt structure. Background Technology
[0002] The condition for detecting the length of an anchor bolt is that there is a reflected wave signal at the bottom of the bolt. However, when the bottom is well bonded, the difference in wave impedance is small, resulting in a very small or even non-existent reflected wave, making it difficult to obtain a reflected signal and thus impossible to obtain an accurate anchor bolt length. Therefore, accurate detection of the anchor bolt length when the grouting at the anchor bolt end is dense is one of the challenging problems in the nondestructive testing industry.
[0003] Currently, to obtain accurate anchor bolt length values, a multi-data (spectrum, phase curve, wave curve) comprehensive analysis method is usually used when processing data. However, this method has the problems of low efficiency and large error. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide an auxiliary device for detecting the length of anchor bolts and an anchor bolt structure, in view of the above-mentioned problems.
[0005] The technical solution adopted by this utility model is: an auxiliary device for detecting the length of an anchor bolt, including a concave end cap, which can be installed on the rock-entry end of the anchor bolt. The concave end cap is made of polyethylene, so that the interface at the junction of the concave end cap and the rock-entry end of the anchor bolt can easily produce a reflected waveform.
[0006] Using the above-mentioned technical means, a concave end cap is installed on the rock-entry end of the anchor rod. The concave end cap is made of polyethylene. The material difference between the concave end cap and the anchor rod causes a sudden change in wave impedance. Therefore, the stress wave can generate a strong reflection signal at the interface between the concave end cap and the end of the anchor rod.
[0007] Another technical solution adopted in this utility model is: an anchor bolt structure, comprising:
[0008] Anchor bolt body;
[0009] An anchor bolt length detection auxiliary device is installed at the rock-entry end of the anchor bolt body.
[0010] In some embodiments, the concave end cap has a concave threaded groove inside, the rock-entry end of the anchor rod body has an external thread on its outer wall, and the rock-entry end of the anchor rod body is threadedly connected to the threaded groove of the concave end cap.
[0011] In some embodiments, the concave end cap is interference-fitted with the rock-entry end of the anchor bolt body.
[0012] In some embodiments, the rock-entry end of the anchor bolt body is coated with an anti-corrosion material.
[0013] The beneficial effects of this utility model are:
[0014] 1. Based on the principle that sound waves generate significant reflections at the interface between two materials with significantly different wave impedances, this application creates a steel-polyethylene interface with a significant difference in wave impedance at the bottom of the anchor rod by installing a concave polyethylene end cap. Due to the large difference in wave impedance between polyethylene and steel, stress waves are strongly reflected at this interface, resulting in a clear echo signal. Therefore, when using the acoustic emission method to detect the anchor rod length, a clear end cap reflection peak can be directly displayed in the non-destructive testing waveform, allowing for rapid determination of the anchor rod length without relying on weak signals or complex analysis, thus demonstrating good practicality. Attached Figure Description
[0015] Figure 1 This is a front view schematic diagram of the anchor bolt length detection auxiliary device.
[0016] Figure 2 This is a side view schematic diagram of the anchor bolt length detection auxiliary device.
[0017] Figure 3 This is a top view of the anchor bolt length detection auxiliary device.
[0018] Figure 4 This is a schematic diagram of the structure of the anchor bolt length detection auxiliary device and the anchor bolt assembly.
[0019] Explanation of reference numerals in the attached figures:
[0020] 1. Anchor bolt body; 2. Concave end cap.
[0021] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.
[0022] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps.
[0023] "First," "second," etc. As used in this article, these terms serve as labels for the nouns preceding them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.).
[0024] The term "based on," as used herein, describes one or more factors that influence the determination. This term does not exclude additional factors influencing the determination. That is, the determination may be based solely on these factors or at least partially on them. Consider the phrase "A is determined based on B." In this case, B is the factor influencing the determination of A, and such phrases do not exclude the possibility that the determination of A may also be based on C. In other instances, A may be determined solely on B. Detailed Implementation
[0025] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.
[0026] Example 1:
[0027] Combination Figures 1 to 3 As shown, this embodiment is an auxiliary device for detecting the length of an anchor bolt, including a concave end cap 2. The concave end cap 2 can be installed on the rock-entry end of the anchor bolt. The concave end cap 2 is made of polyethylene, so that the interface at the junction of the concave end cap 2 and the rock-entry end of the anchor bolt can easily produce a reflected waveform.
[0028] Furthermore, in this embodiment, the groove depth of the concave end cap 2 should not be too deep to ensure that the effective total length of the anchor rod meets the design requirements.
[0029] Furthermore, after the anchor bolt grouting installation is completed and the mortar reaches a certain age, the anchor bolt is tested using the traditional sonic method. In the waveform diagram, a reflected waveform can be clearly observed at the end of the anchor bolt. Based on the location of this reflected waveform, the length of the anchor bolt can be quickly determined.
[0030] The implementation principle of the anchor bolt length detection auxiliary device in this embodiment of the utility model is as follows:
[0031] Based on the principle that sound waves generate significant reflections at the interface between two materials with significantly different wave impedances, a concave end cap 2 made of polyethylene is installed at the rock-entry end of the anchor rod. This artificially creates an interface with a significant difference in wave impedance at the bottom of the anchor rod—the steel-polyethylene interface. Due to the large difference in wave impedance between polyethylene and steel, stress waves are strongly reflected at the interface between the concave end cap 2 and the end of the anchor rod, thus generating a clear echo signal. When using the acoustic emission method to detect the length of the anchor rod, a clear reflection peak from the end cap can be directly observed in the waveform diagram, without relying on weak signals or complex analysis. This device has a simple structure, is easy to operate, and can solve the signal loss problem caused by grouting compaction, demonstrating good practicality.
[0032] Example 2:
[0033] Combination Figure 4As shown, this embodiment is an anchor bolt structure, including an anchor bolt body 1 and the anchor bolt length detection auxiliary device described in Embodiment 1. The concave end cap 2 in the anchor bolt length detection auxiliary device is installed at the rock-entry end of the anchor bolt body 1.
[0034] In some implementations, the concave end cap 2 has a concave threaded groove inside, and the rock-entry end of the anchor bolt body 1 has an external thread on its outer wall. The rock-entry end of the anchor bolt body 1 is threadedly connected to the threaded groove of the concave end cap 2.
[0035] The concave end cap 2 is tightly threaded to the anchor body 1, minimizing the risk of signal distortion due to loosening. Simultaneously, the threaded connection ensures a tight physical interface between the two materials, allowing the abrupt change in wave impedance to manifest. If gaps, like air layers, exist, reflections may occur at incorrect locations.
[0036] Furthermore, the concave end cap 2 is interference-fitted with the rock-entry end of the anchor bolt body 1.
[0037] Furthermore, for anchor bolts requiring corrosion protection, anti-corrosion material should be applied to the rock-entry end of the anchor bolt body 1 before the concave end cap 2 is installed.
[0038] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.
Claims
1. An auxiliary device for detecting the length of an anchor bolt, characterized in that, Includes a concave end cap (2), which can be installed on the rock-entry end of the anchor rod. The concave end cap (2) is made of polyethylene, so that the interface at the junction of the concave end cap (2) and the rock-entry end of the anchor rod can easily produce a reflected waveform.
2. An anchor bolt structure, characterized in that, include: Anchor bolt body (1); The anchor bolt length detection auxiliary device according to claim 1 is installed at the rock-entry end of the anchor bolt body (1).
3. The anchor bolt structure according to claim 2, characterized in that: The concave end cap (2) has a concave threaded groove inside, and the rock-entry end of the anchor rod body (1) has an external thread on its outer wall. The rock-entry end of the anchor rod body (1) is threadedly connected to the threaded groove of the concave end cap (2).
4. The anchor bolt structure according to claim 2, characterized in that: The concave end cap (2) is interference-fitted with the rock-entry end of the anchor body (1).
5. An anchor bolt structure according to claim 2, characterized in that: The rock-entry end of the anchor bolt body (1) is coated with anti-corrosion material.