Device for coal mine underground anchor rod pull-out test

Abstract

The utility model discloses a device for coal mine underground anchor rod drawing test, including the connecting pipe, including first connecting pipe and second connecting pipe, first connecting pipe head end matching anchor rod nut setting first connecting hole, the end matching second connecting pipe is equipped with second connecting hole, and first connecting hole bore is less than anchor rod nut head end outer diameter, and the connecting place of first connecting hole and second connecting hole is equipped with the step, and first connecting pipe is connected with anchor rod nut through the step, and first connecting pipe is connected with second connecting pipe through second connecting hole, and second connecting pipe end thread connection pull rod head end, and pull rod outer cover sets up the sleeve and pull rod end stretches out the sleeve. Through pull rod and drawing test machine connection, thereby ensure drawing test machine occlusion stable, and the connection is reliable, can accurate test the drawing force of borehole anchor rod, solves the problem that the anchor rod is too short and leads to the occlusion of drawing test machine not to anchor rod when using anchor rod drawing test machine test currently, increases the difficulty of test.

Description

Technical Field

[0001] This utility model belongs to the technical field of anchor bolt pull-out test device, specifically relating to a device for anchor bolt pull-out tests in coal mines. Background Technology

[0002] To confirm that the anchor bolts in the coal mine have achieved good support effect, it is necessary to test their pull-out force. However, during the construction of the anchor bolt holes, if the hole is too deep, the exposed length of the anchor bolt will be too short; if the hole is too shallow, the exposed length of the anchor bolt will be too long. When using the anchor bolt pull-out testing machine, if the exposed length of the anchor bolt is too short, the testing machine will not be able to engage the anchor bolt, increasing the difficulty of the test. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a device for pulling out anchor bolts in underground coal mines.

[0004] The technical solution adopted by this utility model is a device for pulling out anchor bolts in underground coal mines, including a connecting pipe, the head end of which is snapped into the anchor bolt nut, and the end of which is threadedly connected to the head end of the pull rod. The pull rod is fitted with a sleeve and the end of the pull rod extends out of the sleeve.

[0005] Furthermore, the aforementioned connecting pipe includes a first connecting pipe and a second connecting pipe. The first connecting pipe has a first connecting hole at its head end matched with an anchor nut, and a second connecting hole at its end matched with a second connecting pipe. The diameter of the first connecting hole is smaller than the outer diameter of the head end of the anchor nut. A step is provided at the connection between the first connecting hole and the second connecting hole. The first connecting pipe is threadedly connected to the second connecting pipe through the second connecting hole.

[0006] Furthermore, the second connecting pipe is provided with a threaded connection hole, which is threaded to the end of the pull rod. The end of the pull rod is in contact with the anchor nut in the first connecting pipe.

[0007] Furthermore, the diameter of the round hole at the end of the sleeve is 3-5 mm larger than the outer diameter of the pull rod.

[0008] Furthermore, a rubber gasket is provided at the end of the aforementioned sleeve.

[0009] Compared with the prior art, the beneficial effects of this utility model are that by setting a connecting pipe and a tie rod, the connecting pipe connects to the anchor nut and then to the tie rod, and the tie rod connects to the pull-out testing machine, thereby ensuring stable engagement and reliable connection of the pull-out testing machine, and accurately testing the pull-out force of the drilled anchor rod. This solves the problem that when using the anchor rod pull-out testing machine, the exposed length of the anchor rod is too short, causing the testing machine to fail to engage the anchor rod, which increases the difficulty of the test. In particular, a sleeve is installed on the outside of the tie rod, which provides support for the pull-out testing tool and helps stabilize the equipment. Attached Figure Description

[0010] Figure 1A cross-sectional view of the apparatus used for the anchor pull-out test;

[0011] Figure 2 This is a cross-sectional view of the first connecting pipe;

[0012] Figure 3 This is a cross-sectional view of the second connecting pipe;

[0013] Figure 4 A cross-sectional view of the anchor bolt nut. Detailed Implementation

[0014] The present invention will be further explained below with reference to the accompanying drawings to enable those skilled in the art to better understand it.

[0015] Example 1

[0016] The device for pulling out anchor bolts in underground coal mines includes a connecting pipe. The head end of the connecting pipe is snapped into the anchor bolt nut 3, and the tail end of the connecting pipe is threadedly connected to the head end of a pull rod 5. Specifically, the connecting pipe includes a first connecting pipe 1 and a second connecting pipe 2. The head end of the first connecting pipe 1 is matched with the anchor bolt nut 3 and has a first connecting hole 101. The tail end of the second connecting pipe 2 is matched with the second connecting pipe 2 and has a second connecting hole 102. The diameter of the first connecting hole 101 is smaller than the diameter of the second connecting hole 102 and the outer diameter of the head end of the anchor bolt nut 3, but larger than the outer diameter of the tail end of the anchor bolt nut 3. A step 103 is provided at the connection between the first connecting hole 101 and the second connecting hole 102. The first connecting pipe 1 is threadedly connected to the second connecting pipe 2 through the second connecting hole 102. The second connecting pipe 2 has a threaded connecting hole 201 inside, which is threadedly connected to the head end of the pull rod 5. The head end of the pull rod 5 is in contact with the anchor bolt nut 3 inside the first connecting pipe 1.

[0017] A sleeve 4 is fitted over the pull rod 5. The diameter of the round hole at the end of the sleeve 4 is 3-5mm larger than the outer diameter of the pull rod 5 to prevent the pull rod 5 from shaking. The end of the pull rod 5 extends out of the sleeve 4 to connect to the anchor pull-out test equipment. During the test, the sleeve 4 plays a supporting role for the equipment. To prevent wear, a rubber pad 6 is provided at the end of the sleeve 4.

[0018] Instructions for use: First, insert the anchor nut 3 into the first connecting hole 101 from the end of the first connecting pipe 1, so that the end of the anchor nut 3 extends out of the first connecting pipe 1 from the first connecting hole 101. The head of the anchor nut 3 is locked on the step 103 inside the first connecting pipe 1. Then connect the first connecting pipe 1 and the second connecting pipe 2. Next, install the anchor nut 3 on the drilled anchor. Then connect the pull rod 5 to the second connecting pipe 2. Tighten the pull rod 5 until its head abuts against the head of the anchor nut 3. Sleeve the sleeve 4 onto the pull rod. Connect the end of the pull rod 5 to the pull test equipment.

[0019] This device provides an anchor bolt pull-out testing apparatus, facilitating anchor bolt pull-out force testing in coal mines, simplifying procedures, improving efficiency, and solving problems such as the short exposed length of anchor bolts affecting testing during underground construction. The connection between the pull rod 5 and the pull-out testing machine ensures stable engagement and reliable connection, enabling accurate testing of the pull-out force of drilled anchor bolts. This addresses the current problem where short exposed anchor bolts prevent the machine from engaging properly, increasing testing difficulty. Furthermore, a sleeve 4 is fitted over the pull rod 5, providing support for the pull-out testing tool and contributing to equipment stability.

[0020] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from its design spirit and principles should fall within the protection scope defined by the claims of the present invention.

Claims

1. An apparatus for conducting pull-out tests on anchor bolts in underground coal mines, characterized in that, The system includes a connecting pipe, the head end of which is snapped into the anchor nut (3), and the tail end is threaded into the head end of the pull rod (5). The pull rod (5) is fitted with a sleeve (4), and the tail end of the pull rod (5) extends out of the sleeve (4). The connecting pipe includes a first connecting pipe (1) and a second connecting pipe (2). The head end of the first connecting pipe (1) is fitted with the anchor nut (3) and has a first connecting hole (101). The tail end of the second connecting pipe (2) is fitted with a second connecting hole (102). The first connecting hole (101) has a small diameter. At the outer diameter of the anchor nut (3), a step (103) is provided at the connection between the first connecting hole (101) and the second connecting hole (102). The first connecting pipe (1) is threadedly connected to the second connecting pipe (2) through the second connecting hole (102). The second connecting pipe (2) is provided with a threaded connecting hole (201), which is threadedly connected to the end of the pull rod (5). The end of the pull rod (5) is in contact with the end of the anchor nut (3) in the first connecting pipe (1).

2. The apparatus for pull-out testing of anchor bolts in underground coal mines according to claim 1, characterized in that, The diameter of the round hole at the end of the sleeve (4) is 3-5 mm larger than the outer diameter of the pull rod (5).

3. The apparatus for pull-out testing of anchor bolts in underground coal mines according to claim 1, characterized in that, The sleeve (4) has a rubber pad (6) at its end.

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