A combined device for anchor rod tension experiment and a using method thereof

Abstract

The present application relates to a kind of combined device and use method for anchor rod tension test.In the mining and coal industry, roadway roof support pull test usually needs anchor rod puller.By using the combined device of the present application, anchor cable tensioning machine has two functions, which can tension anchor cable and do anchor rod tension test.The combined device includes sleeve support and connector, the sleeve support is cylindrical structure, the upper end is provided with support structure, the lower part is contracted in outer diameter and inner diameter, the outer surface is reduced to form right-angle bayonet for positioning force matching with the end of anchor cable tensioning machine.The connector is cylindrical structure, the upper section is provided with internal thread for matching with anchor rod end thread connection, the lower section is fixedly connected with a section of anchor cable, the outer diameter of the connector is less than the minimum inner diameter of the sleeve support.Anchor cable tensioning machine uses the combined device, realizes one machine multi-use, reduces management cost and improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of mine and coal mine roadway roof support technology, and in particular to an anchor bolt tension test device and method for testing the quality of roadway roof support. Background Technology

[0002] In mining and coal tunneling, the safety of roadway roof support is paramount, and the quality inspection of anchor bolts and cables is a crucial step. Currently, anchor bolt pull-out tests typically require a specialized pointer-type anchor bolt pull-out instrument. This equipment is usually equipped with a manual hydraulic pump, requiring manual and repeated cranking of the pressure handle to apply pressure. This process is time-consuming, labor-intensive, and cumbersome, and the equipment is inconvenient to store and carry.

[0003] On the other hand, anchor tensioning machines are commonly available on-site for tensioning anchor cables, but their structure and function are limited to anchor cable tensioning and cannot be directly used for anchor bolt tension tests. This necessitates the use of two separate sets of equipment on-site, resulting in redundant investment, low utilization, tangled and chaotic hydraulic pipelines, high management costs, and certain operational safety hazards. Therefore, how to utilize existing equipment to achieve multiple uses, simplify operating procedures, and reduce management costs has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a combined device and method for testing anchor bolt tension. Through ingenious structural design, a conventional anchor cable tensioning machine is equipped with the function of testing anchor bolt tension, achieving multiple uses in one machine.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A combined device for anchor bolt tension testing, applied to an anchor cable tensioning machine, includes a sleeve support and a connector. The sleeve support is a cylindrical structure with a support structure at its upper end for abutting the enlarged and thickened anchor bolt tray. Its lower part has a tapered outer and inner diameter, with the reduced outer surface forming a right-angle bayonet for positioning and bearing force with the end of the anchor cable tensioning machine. The connector is a cylindrical structure with an internal thread at its upper section for threaded connection with the anchor bolt end, and a section of anchor cable fixedly connected to its lower section. The outer diameter of the connector is smaller than the minimum inner diameter of the sleeve support, allowing the connector to be coaxially inserted and fitted inside the sleeve support, and the anchor cable to pass through the sleeve support and extend beyond it.

[0006] Furthermore, the right-angle bayonet is formed by thickening the lower wall of the sleeve support inward, and the horizontal surface of the right-angle bayonet is used to bear the axial thrust of the end of the anchor cable tensioning machine.

[0007] Furthermore, the upper and lower sections of the connector are not connected, forming a blind hole structure; the lower section of the connector is fixedly connected to the anchor cable by crimping or welding.

[0008] Furthermore, the anchor cable fixedly connected to the lower section of the connector has a length of 15cm to 120cm to adapt to the needs of different on-site installation and operation spaces.

[0009] The present invention also provides a method of using the above-mentioned combined device for anchor bolt tension testing, comprising the following steps: S1. Fabricate the sleeve support component so that its right-angle bayonet matches the end shape of the anchor cable tensioning machine used on site, and the dimensions of the support structure are adapted to the anchor rod and anchor rod tray to be tested.

[0010] S2. Fabricate the connector so that its internal thread specification matches the outer diameter and thread parameters of the anchor rod to be tested, and fix the lower section of the connector to the anchor cable by crimping or welding.

[0011] S3. On-site, tighten and fix the internal thread of the upper section of the connector and the exposed end of the anchor rod to be tested.

[0012] S4. Pass the sleeve support through the anchor cable, put it over the connector, and push it upward until the support structure abuts against the surface of the anchor tray.

[0013] S5. Pass the anchor cable connected to the lower end of the connector through the anchor cable tensioning machine, and make the end of the anchor cable tensioning machine abut against the right-angle bayonet of the sleeve support.

[0014] S6. The anchor cable tensioning machine clamps the anchor cable and activates the hydraulic system. The anchor cable tensioning machine applies a downward pulling force to the anchor rod through the anchor cable. The reaction force acts upward from the end of the anchor cable tensioning machine onto the right-angle clamp, and is transmitted to the support structure to apply pressure to the anchor rod tray, which is then transmitted to the top plate. The pull-out test is completed by reading the hydraulic gauge. Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By innovatively utilizing the combination of sleeve support components and connectors, a functional breakthrough has been achieved in conducting pull-out experiments using a tensioning machine.

[0016] Compact structure and multi-functional: The connector and sleeve support adopt a coaxial assembly structure with precise outer diameter matching, making the overall structure of the device compact and not occupying extra space. No need to purchase a dedicated tensioning instrument, significantly improving the equipment utilization rate of existing anchor cable tensioning machines.

[0017] Highly efficient and labor-saving operation: The hydraulic pump station built into the anchor tensioning machine is used to provide power to the anchor tensioning machine, replacing the heavy labor of traditional manual shaking and pressurization, which significantly reduces the physical exertion of operators and improves work efficiency.

[0018] Compatibility and sealing: The connector is designed with a blind hole structure to prevent coal dust and debris from entering the anchor bolt hole and affecting the experimental accuracy; the anchor cable length has a wide adjustable range and strong adaptability.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the combined device of the present invention used in conjunction with an anchor cable tensioning machine; Figure 2 This is a longitudinal sectional view of the sleeve support component of the present invention; Figure 3 This is a bottom view of the sleeve support component of the present invention; Figure 4 This is a longitudinal sectional view of the connector of the present invention; Figure 5 This is a bottom view of the connector of the present invention; Figure 6 This is a schematic diagram of the cross-sectional view of a conventional anchor cable tensioning machine in use. Figure 7 This is a schematic diagram of the usage state of a conventional pointer-type anchor bolt pull-out instrument.

[0021] In the diagram: 1-Sleeve support, 2-Connector, 21-Internal thread, 3-Support structure, 4-Bayonet, 5-Anchor cable tensioning machine, 6-Anchor rod, 7-Anchor cable, 8-Anchor rod tray, 9-Top plate, 10-Pressure handle. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] This embodiment provides a combined device for anchor bolt tension testing, such as... Figures 1 to 5 As shown, this assembly is specifically designed for use with a conventional anchor tensioning machine 5. Its core components include a sleeve support 1 and a connector 2. The sleeve support 1 is a cylindrical structure made of high-strength steel. Its upper end is designed as an enlarged, thickened support structure 3, the upper surface of which is used to smoothly abut against the anchor rod tray 8 during testing, providing stable reaction force support. The lower part of the sleeve support 1 tapers inward from the inner radial direction, forming an annular step, which constitutes a right-angle latch 4. The design of this right-angle latch 4 is one of the key points of this invention; its horizontal bearing surface can fit tightly against the end of the anchor tensioning machine 5, ensuring that the reaction force from the tensioning machine end is transmitted to the sleeve support 1.

[0024] Connector 2 is also a cylindrical structure. Its upper section has an internal thread 21 machined inside, the specification of which perfectly matches the male thread of the end of the anchor rod 6 to be tested on site, facilitating quick tightening. The lower section of connector 2 is securely fixed to an anchor cable 7 with a length of 20cm (in practice, any length within the range of 15cm to 120cm can be selected) through crimping, welding, or other methods. The overall outer diameter of connector 2 is designed to be smaller than the minimum inner diameter of the sleeve support 1 to ensure that connector 2 can be smoothly inserted and placed inside the sleeve support 1. To enhance reliability, the upper and lower internal sections of connector 2 are designed as non-connected blind hole structures.

[0025] The method for conducting anchor bolt tension tests using the combined device of this embodiment is as follows: First, prepare a sleeve support 1 that matches the model of the anchor cable tensioning machine 5 on site, and prepare a connector 2 that matches the specifications of the commonly used anchor rod 6.

[0026] Specifically, the following steps are included: Step 1: Pre-fabricate the sleeve support 1 so that its right-angle bayonet 4 matches the end shape of the anchor cable tensioning machine 5 used on site, and the dimensions of its support structure 3 are adapted to the anchor rod 6 and anchor rod tray 8 to be tested.

[0027] Step 2: Pre-fabricate the connector 2 so that the specification of its internal thread 21 matches the outer diameter and thread parameters of the anchor rod 6 to be tested. The lower section of the connector is fixedly connected to the anchor cable 7 by crimping or welding.

[0028] Step 3: On-site, tighten and fix the internal thread 21 of the upper section of the connector 2 and the exposed end of the anchor rod 6 to be tested.

[0029] Step 4: Pass the sleeve support 1 through the anchor cable 7 and put it over the connector 2 and push it up until the support structure 3 abuts against the surface of the anchor tray 8.

[0030] Step 5: Pass the anchor cable 7 connected to the lower end of the connector 2 through the anchor cable tensioning machine 5, and make the end of the anchor cable tensioning machine 5 abut against the right angle bayonet 4 of the sleeve support 1.

[0031] Step Six: The anchor cable tensioning machine 5 clamps the anchor cable 7 and starts the hydraulic system. The anchor cable tensioning machine 5 applies a downward pulling force to the anchor rod 6 through the anchor cable 7. The reaction force acts upward from the end of the anchor cable tensioning machine 5 onto the right-angle clamp 4, and is transmitted to the support structure 3 to apply pressure to the anchor rod tray 8, which is then transmitted to the top plate 9. The pull-out test is completed by reading the hydraulic gauge. The conventional anchor cable tensioning machine 5 cannot adapt to the functions of the anchor bolt tension testing machine (see attached). Figure 6 This results in low equipment reuse rates, poor operational safety, and tangled hydraulic lines between the two sets of equipment on site, leading to high management costs. Conventional anchor tensioning machines do not have the functionality of anchor bolt tension testing machines; a pointer-type anchor bolt pull-out tester is required (see attached). Figure 7 It requires manual repeated cranking of the oil pump pressurization handle 10, which is time-consuming and laborious, with complicated operation procedures and inconvenient storage and carrying.

[0032] The onboard anchor cable tensioning machine of the tunneling and anchoring machine utilizes the hydraulic pump station of the tunneling and anchoring machine, eliminating the need for manual pressurization. The combined device for anchor bolt tension testing of this invention enables the anchor cable tensioning machine to have two functions: it can tension anchor cables and conduct anchor bolt tension tests, achieving multiple uses in one machine, reducing management costs, and improving work efficiency.

Claims

1. A combined device for testing anchor bolt tension, applied to an anchor cable tensioning machine (5), characterized in that, The device includes a sleeve support (1) and a connector (2). The sleeve support is a cylindrical structure with a support structure (3) at its upper end for abutting against the expanded and thickened anchor rod tray (8). Its lower outer and inner diameters are contracted, and the position of the reduced outer surface forms a right-angle bayonet (4) for positioning and bearing with the end of the anchor cable tensioning machine (5). The connector (2) is a cylindrical structure with an internal thread (21) at its upper section for threaded connection with the end of the anchor rod (6). A section of anchor cable (7) is fixedly connected to its lower section. The outer diameter of the connector (2) is smaller than the minimum inner diameter of the sleeve support (1), so that the connector (2) can be coaxially inserted and fitted inside the sleeve support (1), and the anchor cable (7) can pass through the sleeve support and extend out of the sleeve support (1).

2. The combined device for anchor bolt tension testing according to claim 1, characterized in that, The right-angle bayonet (4) is formed by increasing the lower wall thickness of the sleeve support (1) inward, and the horizontal surface of the right-angle bayonet (4) is used to bear the axial thrust of the end of the anchor cable tensioning machine (5).

3. The combined device for anchor bolt tension testing according to claim 1, characterized in that, The upper and lower sections of the connector (2) are not connected, forming a blind hole structure; the lower section of the connector is fixedly connected to the anchor cable (7) by crimping or welding.

4. The combined device for anchor bolt tension testing according to claim 1, characterized in that, The lower section of the connector (2) is fixedly connected to the anchor cable (7) which is 15cm to 120cm long.

5. A method of using a combined apparatus for anchor bolt tension testing as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Make the sleeve support (1) so that its right angle bayonet (4) matches the end shape of the anchor cable tensioning machine (5) used on site, and the size of its support structure (3) is adapted to the anchor rod (6) to be tested and the anchor rod tray (8). S2. Fabricate the connector (2) so that the specification of its internal thread (21) matches the outer diameter and thread parameters of the anchor rod (6) to be tested, and the lower section of the connector is fixedly connected to the anchor cable (7) by crimping or welding. S3. On site, tighten and fix the internal thread (21) of the upper section of the connector (2) and the exposed end of the anchor rod (6) to be tested; S4. Pass the sleeve support (1) through the anchor cable (7) and put it over the connector (2) and push it up until the support structure (3) abuts against the surface of the anchor tray (8); S5. Pass the anchor cable (7) connected to the lower end of the connector (2) through the anchor cable tensioning machine (5) and make the end of the anchor cable tensioning machine (5) abut against the right angle bayonet (4) of the sleeve support (1). S6. The anchor tensioning machine (5) clamps the anchor cable (7) and starts the hydraulic system. The anchor tensioning machine (5) applies a downward pulling force to the anchor rod (6) through the anchor cable (7). The reaction force is transmitted from the end of the anchor tensioning machine (5) upward to the right angle bayonet (4) to the support structure (3) to apply pressure to the anchor rod tray (8). The pull-out test is completed by reading the hydraulic gauge.

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