Tube seam type anchor rod drawing force testing device

Abstract

The utility model discloses a pipe seam type anchor rod drawing force testing device, which is characterized in that a gasket sleeved on a pipe seam type anchor rod and clamped with an anchor rod baffle ring is of a two-section structure, the two sections are combined to form a cylinder body with a gasket flange at the end part, and the outer side of the cylinder body is bound and fixed through an iron wire. And the inner end of the small sleeve is provided with a clamping ring for clamping the flange of the gasket from the inner side. The outer end of the small sleeve is fixedly connected with a small sleeve rod body. The inner end of the large sleeve is open, and the outer end of the large sleeve is provided with an end plate with a center hole. The small sleeve rod body penetrates through the center hole outwards, and the outer end of the small sleeve rod body is connected with a nut used for tightly jacking the hollow jack towards the inner side. The gasket not only has the characteristic of being convenient to assemble, but also can adapt to rod bodies with different thicknesses and is tightly matched with the anchor rod. By utilizing the device, the anchor rods with different sizes can be subjected to drawing test, and the coaxiality adjustment difficulty of related parts of the device is reduced.

Description

Technical Field

[0001] The utility model relates to a device for testing the pulling force of an anchor rod. Background Art

[0002] The pipe seam anchor is a full-length anchor used mainly for reinforcing surrounding rocks. Its main part is a high-strength round steel pipe with a longitudinal seam, and a retaining ring is fixedly welded at the end of the round steel pipe. After being installed in a borehole slightly smaller than the pipe diameter, the steel pipe exerts radial pressure on the hole wall over the entire length and generates friction between the hole wall and the hole wall. In addition, the supporting force of the anchor tray plate puts the surrounding rock in a three-dimensional stress state, which plays a role in stabilizing the rock formation.

[0003] The pull-out force of anchor bolts is an important indicator for judging whether the quality of anchor bolt support is qualified. Conventional anchor bolt pull-out testers are mainly used for reinforcement materials such as threaded steel bars, and are not suitable for testing the pull-out force of pipe-seam anchor bolts.

[0004] As an existing technology, the pull-out force test of the pipe seam anchor is usually carried out by welding threaded steel bars on the exposed end of the anchor or setting a fixing mechanism inside the anchor, and then using a puller to test. The above methods have the following main defects: first, underground hot work is required, which poses a safety hazard; second, the fixing mechanism inside the anchor is not easy to remove after use, making it difficult to reuse.

[0005] The Chinese utility model with the authorization announcement number CN205483973U discloses "a device for measuring the pull-out force of a pipe-seam anchor on site", which is mainly composed of a clamp ring, a U-shaped slot, a support frame, a through-type jack, a pull rod and a ruler. When conducting the test, each component is installed in turn, and it is checked whether the entire device and the pipe-seam anchor are in a coaxial state; the through-type jack is operated to inject oil and load, so that the through-type jack drives the pull rod and the U-shaped slot, clamp ring and other components connected thereto, thereby realizing the pulling action of the pipe-seam anchor. Although this device can ensure that the pull-out force applied during the pulling process is always in a concentric state with the pipe-seam anchor, thereby obtaining accurate pull-out force measurement results, and is easy to carry, does not require the use of electrical equipment, and is not restricted by the power source and the place of use, it has the following major defects: First, its clamp ring has a fixed diameter, which is difficult to adapt to the test of anchors of different diameters, and the clamp ring needs to be replaced when the diameter of the anchor to be tested changes greatly. Second, because the diameter of the clamping ring is fixed, it is difficult to achieve a perfect fit between it and the anchor rod to be tested, and the gap between the clamping ring and the anchor rod to be tested will increase the difficulty of adjusting the coaxiality of the relevant parts of the device. Third, the support frame and the through-type jack are both equipped with safety pull rings, on which a hook or rope can be fixed, and the other end is fixed to the rock wall or other supportive places. Although it can prevent the measuring instrument from falling under the action of gravity during or after the test, and play a role in protecting the instrument and preventing injuries, because the device is suspended by a rope (flexible part), the constraint on the device is limited to pulling upward, and it is difficult to use the rope to adjust the coaxiality of the device in all directions. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a pipe seam type anchor rod pull-out force testing device. Firstly, the clamping mechanism for applying force to the anchor rod retaining ring can adapt to different rod diameters and fit closely with the anchor rod; secondly, the device can be supported and positioned more reasonably during testing, and the coaxiality of the device can be adjusted in all directions more conveniently.

[0007] The technical solution of the utility model is as follows:

[0008] A pipe seam anchor pull-out force testing device comprises an anchor puller, the anchor puller comprises a hollow jack, and also comprises a washer used to be sleeved on the pipe seam anchor and clamped with the anchor retaining ring of the pipe seam anchor, the washer is a two-petal structure, the side of the single-petal washer has concave-convex tooth-shaped mortise and tenon teeth, and the convex teeth of one petal washer are inserted into the groove of the other petal washer; the two petals are combined to form a cylinder with a washer flange at the end, and the outer side of the cylinder is fixed by binding with iron wire; the washer flange is used to clamp with the anchor retaining ring; the The testing device also includes a small sleeve sleeved on the outside of the gasket, the inner end of the small sleeve has a clamping ring for clamping the gasket flange from the inside; the outer end of the small sleeve is fixedly connected to a small sleeve rod body, and the outer end of the small sleeve rod body is threaded; the testing device also includes a large sleeve sleeved on the outside of the small sleeve, the inner end of the large sleeve is open and the outer end has an end plate with a center hole; the small sleeve rod body passes through the center hole outwardly and the outer end is connected to a nut for tightening the hollow jack inwardly.

[0009] Preferably, the small sleeve is in the shape of a side-opening cylinder.

[0010] Preferably, the testing device also includes a supporting and positioning mechanism, which includes a supporting plate located directly below the large sleeve; an arc-shaped bracket is arranged between the large sleeve and the support plate for fitting the large sleeve from the bottom; an inner and outer hinge support are installed on the bottom side of the arc-shaped bracket; the support plate is provided with an inner and outer vertical through hole corresponding to the positions of the two hinge supports respectively; a screw is installed in the vertical through hole; the upper end of the screw is provided with a hinge plate; the corresponding hinge plate and the hinge support are connected to each other through a hinge shaft; and a threaded sleeve is installed at the lower end of the screw.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] First, the gasket of the utility model adopts a two-petal structure, and the two petals are combined to form a cylindrical body with a gasket flange at the end (when the two petals are fully matched) or an elliptical cylindrical body (when the two petals are not fully matched). The side of the single-petal gasket has concave and convex mortise and tenon teeth. After the mortise and tenon teeth of the two-petal gaskets are plugged into each other, the depth of the convex teeth inserted into the corresponding groove depends on the outer diameter of the tube seam anchor rod. Therefore, this gasket is not only easy to assemble, but also can adapt to rods of different thicknesses, and fit tightly with the anchor rod (no gap). The device can be used to perform pull-out tests on anchor rods of different sizes, and reduces the difficulty of coaxiality adjustment of related components of the device.

[0013] Second, the small sleeve of the utility model is a side-opening cylindrical sleeve, and when in use, it is inserted from one side of the side wall of the gasket (radial insertion), which has the characteristics of convenient loading and unloading.

[0014] Third, the utility model has a unique supporting and positioning mechanism, which is more conducive to the directional adjustment of the large sleeve and the hollow jack tightly matched with the large sleeve. After adjustment, the large sleeve is positioned by the arc-shaped bracket, which can ensure that the relevant components always maintain good coaxiality during the test process, and the test results are more accurate and reliable.

[0015] Fourth, there is no need for underground fire operations, eliminating fire hazards.

[0016] Fifth, the anchor rod connection mechanism is easy to disassemble after use and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the gasket in the embodiment of the utility model.

[0019] Figure 3 It is a top view schematic diagram of a (single-petal) gasket in an embodiment of the utility model.

[0020] Figure 4 It is a front view schematic diagram of a small sleeve in an embodiment of the utility model.

[0021] Figure 5 It is a side view schematic diagram of the small sleeve in the embodiment of the utility model.

[0022] Figure 6 It is a top view schematic diagram of the small sleeve in the embodiment of the utility model.

[0023] Figure 7 This is a front view schematic diagram of a large sleeve in an embodiment of the utility model, and the side view of the large sleeve is the same as the front view schematic diagram.

[0024] Figure 8 It is a top view schematic diagram of the large sleeve in the embodiment of the utility model.

[0025] Fig. 9 It is a structural schematic diagram of the supporting and positioning mechanism in an embodiment of the utility model.

[0026] In the figure, 1. pipe-seam type anchor rod, 1-1. anchor rod retaining ring, 2. washer, 2-1. washer flange, 2-2. mortise and tenon teeth, 3. small sleeve, 3-1. retaining ring, 4. small sleeve rod body, 5. large sleeve, 6. supporting and positioning mechanism, 6-1. support plate, 6-2. arc bracket, 6-3. hinge support, 6-4. hinge shaft, 6-5. hinge plate, 6-6. screw, 6-7. threaded sleeve, 7. anchor rod puller, 7-1. hollow jack, 7-1-1. lifting ring, 7-2. oil pipe, 7-3. oil storage cylinder, 7-4. pressure handle, 7-5. pressure gauge, 8. nut. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the embodiments and the accompanying drawings.

[0028] like Figure 1 This embodiment includes an anchor puller 7. The anchor puller 7 includes a hollow jack 7-1, and the hollow jack 7-1 is connected to an oil storage cylinder 7-3 through an oil pipe 7-2. An outer wall of the hollow jack 7-1 is fixed with an inner and outer lifting ring 7-1-1.

[0029] This embodiment also includes a washer 2 which is used to be sleeved on the pipe seam type anchor rod 1 and whose outer end is clamped with the anchor rod retaining ring 1-1 of the pipe seam type anchor rod 1. Figure 2 and Figure 3 The washer 2 is a two-petal structure. The two petals are combined to form a cylindrical body with a washer flange 2-1 at the end (when the two petals are fully matched) similar to an elliptical cylinder (when the two petals are not fully matched). The side of the single-petal washer has concave-convex mortise and tenon teeth 2-2, and the bottom has a semicircular washer flange 2-1. After the mortise and tenon teeth 2-2 of the two-petal washers are plugged into each other, they are tied and fixed on the outside with wire. The depth of the convex teeth inserted into the corresponding groove depends on the outer diameter of the tube-seam anchor rod 1. The inner diameter of the washer 2 is between the outer diameter of the tube-seam anchor rod 1 and the outer diameter of the anchor rod retaining ring 1-1. After plugging and matching, the washer 2 and the anchor rod 1 rod body are tightly matched.

[0030] This embodiment also includes a small sleeve 3 sleeved outside the gasket 2. Figure 4 , Figure 5 and Figure 6 , the inner end of the small sleeve 3 ( Figure 1 The right end of the small sleeve 3 has a clamping ring 3-1 for clamping the washer flange 2-1 from the inside to provide axial force for the washer 2. The outer end of the small sleeve 3 is fixedly connected to a small sleeve rod 4, and the outer end of the small sleeve rod 4 has a thread. For easy assembly, the small sleeve 3 is a side-opening cylindrical shape. Figure 5 The side-opening cylindrical shape refers to the opening of the side wall plate of the small sleeve 3 to allow the small sleeve 3 to be radially installed from one side of the gasket 2.

[0031] This embodiment also includes a large sleeve 5 sleeved outside the small sleeve 3. Figure 7 and Figure 8 The outer end of the large sleeve 5 has an end plate with a center hole 5-1, and the inner end is open. The small sleeve rod 4 passes through the center hole 5-1 outwardly and the outer end is connected to a nut 8 for tightening the hollow jack 7-1 inwardly. The washer 2, small sleeve 3, small sleeve rod 4, large sleeve 5 and hollow jack 7-1 are all coaxially assembled with the pipe seam anchor 1, as shown in FIG. Figure 1During the pull-out test, the small sleeve rod 4 passes through the center hole 5-1 outward and passes out along the axis of the hollow jack 7-1. The passing end is connected to the nut 8. By tightening the nut 8, the hollow jack 7-1 and the large sleeve 5 are tightly pressed against each other.

[0032] This embodiment also includes a supporting and positioning mechanism 6. Fig. 9 The supporting and positioning mechanism 6 includes a support plate 6-1 whose inner end is used to be fixed on the top of the tunnel or inside the tunnel wall, and whose exposed part is located directly below the large sleeve 5. An arc-shaped bracket 6-2 for fitting the large sleeve 5 from the bottom is provided between the large sleeve 5 and the support plate 6-1. An inner and outer hinge support 6-3 are installed on the bottom side of the arc-shaped bracket 6-2. The support plate 6-1 is provided with an inner and outer vertical through hole respectively corresponding to the positions of the two hinge supports 6-3, and a screw 6-6 is installed in the vertical through hole. The upper end of the screw 6-6 is provided with a hinge plate 6-5 integral with the screw 6-6, and the corresponding hinge plate 6-5 and the hinge support 6-3 are connected to each other through a hinge shaft 6-4. A threaded sleeve 6-7 is installed on the lower end of the screw 6-6.

[0033] During the pull-out test, if the force exerted by the hollow jack 7-1 on the pipe-seam anchor 1 exceeds the friction force (anchoring force) between the pipe-seam anchor 1 and the hole wall, the small sleeve 3 and the small sleeve rod 4 will move outward, and the hollow jack 7-1 will be out of contact with the large sleeve 5. Since the small sleeve 3 is located inside the large sleeve 5 and cannot be separated from the large sleeve 5, the hollow jack 7-1 will not fall. However, in order to prevent the hollow jack 7-1 from being hit when it is separated from the large sleeve 5 and to better protect related components, it is best to suspend the hollow jack 7-1 on the rock wall above the hollow jack 7-1 through a suspension rope connected to the suspension ring 7-1-1 at the lower end.

[0034] The following examples illustrate the use of the present invention.

[0035] Construction drilling: Use a rock drill / anchor trolley to drill holes on the side of the tunnel. After drilling, use high-pressure air to clean the residue in the hole; and fix the support plate 6-1 directly below the drill hole.

[0036] Install anchor rods: Use a rock drill / anchor rod trolley to push the pipe-slit anchor rod 1 into the borehole at a uniform speed. The exposed length of the pipe-slit anchor rod 1 is 8 to 10 cm.

[0037] Install the gasket: Make the two-piece gasket 2 clamp the exposed tail of the pipe seam anchor 1, and make the gasket flange 2-1 close to the anchor retaining ring 1-1, and tie it with wire to prevent the two-piece gasket 2 from separating.

[0038] Install the small sleeve: clamp the gasket 2 into the small sleeve 3 through the side door hole of the small sleeve 3, and make the clamping ring 3-1 clamp the gasket flange 2-1.

[0039] Install the large sleeve: After the small sleeve rod body 4 passes through the gasket flange 2-1, the large sleeve 5 is hung on the tunnel wall and the inner end of the large sleeve 5 is close to the rock wall.

[0040] Support positioning: install the screw rod 6-6, the articulated shaft 6-4 and the threaded sleeve 6-7 in sequence. Adjust the large sleeve 5 to be coaxial with the pipe seam anchor rod 1 by rotating the inner and outer threaded sleeves 6-7.

[0041] Connecting the hollow jack: The small sleeve rod body 4 passes through the hollow jack 7-1, and the inner end of the hollow jack 7-1 is closely attached to the end plate of the large sleeve 5, and then the nut 8 is turned to make the hollow jack 7-1 and the large sleeve 5 closely attached. The hollow jack 7-1 is suspended on the rock wall above the hollow jack 7-1 by a hanging rope whose lower end is connected to the hanging ring 7-1-1. The small sleeve rod body 4 and the large sleeve 5 provide support for the hollow jack 7-1.

[0042] Pull-out test: connect the anchor puller 7, manually press the pressure handle 7-4 of the anchor puller 7 to perform a pull-out test, and read the test data through the pressure gauge 7-5 of the anchor puller 7.

[0043] Disassembly of the test equipment: After the test is completed, disassemble the supporting positioning mechanism 6, the nut 8, the hollow jack 7-1, the large sleeve 5, the small sleeve rod 4, the small sleeve 3 and the washer 2 in sequence.

Claims

1. A pipe seam anchor pull-out force testing device, comprising an anchor puller (7), the anchor puller (7) comprising a hollow jack (7-1), and also comprising a washer (2) for being sleeved on the pipe seam anchor (1) and being engaged with an anchor retaining ring (1-1) of the pipe seam anchor (1), characterized in that: The washer (2) is a two-petal structure, the side of the single-petal washer has concave-convex tooth-shaped mortise and tenon teeth (2-2), and the convex teeth of one petal washer are inserted into the groove of the other petal washer; the two petals are combined to form a cylinder with a washer flange (2-1) at the end, and the outer side of the cylinder is fixed by binding with iron wire; the washer flange (2-1) is used to clamp with the anchor rod retaining ring (1-1); the testing device also includes a small sleeve (3) sleeved on the outer side of the washer (2), and the inner end of the small sleeve (3) has a sleeve for clamping the washer flange (2-1) from the inside. 2-1); the outer end of the small sleeve (3) is fixedly connected to a small sleeve rod body (4), the outer end of the small sleeve rod body (4) having a thread; the testing device also includes a large sleeve (5) sleeved on the outer side of the small sleeve (3), the inner end of the large sleeve (5) being open and the outer end having an end plate with a center hole (5-1); the small sleeve rod body (4) passes outward through the center hole (5-1) and the outer end is connected to a nut (8) for tightening the hollow jack (7-1) inwardly.

2. The pipe seam anchor pull-out force testing device according to claim 1, characterized in that: The small sleeve (3) is in the shape of a cylinder with a side-opening door.

3. The pipe seam anchor pull-out force testing device according to claim 1 or 2, characterized in that: The testing device further comprises a supporting and positioning mechanism (6), the supporting and positioning mechanism (6) comprising a supporting plate (6-1) located directly below the large sleeve (5); an arc-shaped bracket (6-2) for fitting the large sleeve (5) from the bottom is arranged between the large sleeve (5) and the supporting plate (6-1); an inner and outer hinge support (6-3) are installed on the bottom side of the arc-shaped bracket (6-2); the supporting plate (6-1) is provided with an inner and outer vertical through hole respectively corresponding to the positions of the two hinge supports (6-3); a screw rod (6-6) is installed in the vertical through hole; the upper end of the screw rod (6-6) is provided with a hinge plate (6-5); the corresponding hinge plate (6-5) and the hinge support (6-3) are connected to each other via a hinge shaft (6-4); and a threaded sleeve (6-7) is installed at the lower end of the screw rod (6-6).

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