Device for testing pulling resistance of anchoring section of anchor rod and anchor rod

Abstract

The utility model provides a device for testing pulling resistance of an anchoring section of an anchor rod, which comprises an anchor rod, the anchor rod comprises an anchoring section and a free section, the device further comprises a bag, the bag is arranged on the anchor rod in a surrounding manner, the bag is located at the joint of the anchoring section and the free section of the anchor rod, and at least one end, far away from the anchoring section, of the bag is provided with a limiting piece; one end of the first tube body is communicated with the bag, and the first tube body is used for communicating the bag with the outside. The bag is filled with mud through the grouting pipe to extrude cement grout in the anchor hole, so that the cement grout in the anchoring section of the anchor rod is isolated from the cement grout in the free section of the anchor rod to form an independent cement stone body, and then the mud in the bag is pumped and discharged to form an isolated cavity. When the uplift bearing capacity of the anchor rod is tested, the uplift bearing capacity of the anchoring section of the anchor rod can be actually measured, and the problem of result distortion caused by the fact that the uplift bearing capacity test result of the anchor rod contains the bearing capacity of the free section of the anchor rod in a traditional anchor rod uplift bearing capacity acceptance test is solved.

Description

A device for testing the pull-out force of an anchor bolt's anchorage section and the anchor bolt itself. Technical Field

[0001] This application relates to the field of geotechnical engineering technology, and in particular to a device for testing the pull-out force of anchor bolt anchorage sections. Background Technology

[0002] To verify the reliability of engineering anchor bolts, an anchor bolt bearing capacity acceptance test must be conducted. This test involves tensioning the anchor bolt at the anchor head using a jack after the anchor bolt has been cured to the specified conditions. The pull-out bearing capacity of the anchor bolt is then measured by measuring the tensile force. This method yields the bearing capacity of the entire length of the anchor bolt, which is undoubtedly accurate for fully bonded anchor bolts. However, for landslide engineering anchor bolts that include both anchored and free sections, the test result actually includes the bearing capacity of both sections. This is often mistakenly interpreted as representing only the pull-out bearing capacity of the anchored section, leading to distorted results that fail to accurately reflect and assess whether the actual anchored section's bearing capacity meets design requirements, thus posing a potential safety hazard. Therefore, a pull-out force testing device capable of resolving this issue is needed. Summary of the Invention

[0003] To address the aforementioned issues, this application proposes a device for testing the pull-out force of anchor bolt anchorage sections. Multiple lifting force points are set at the bottom of the geotextile bag, connected by a load-bearing belt and a lifting sling. This allows a crane to directly lift the soil-filled geotextile bag during construction, distributing the force across the bottom to counteract the weight of the soil. Furthermore, lifting requires no additional tools, making the operation convenient. The geotextile bag in this application uses Velcro closure, making it easy and practical to operate, and significantly reducing construction time.

[0004] This application is achieved through the following technical solution:

[0005] As the first solution of this application, a device for testing the pull-out force of an anchor bolt's anchorage section is disclosed, including an anchor bolt, the anchor bolt including an anchorage section and a free section, and further including: a bag, the bag being arranged around the anchor bolt, the bag being located at the connection between the anchorage section and the free section of the anchor bolt, and the bag having a limiting member at least at one end away from the anchorage section;

[0006] A first tube, one end of which is connected to the sac, is used to connect the sac to the outside.

[0007] Furthermore, the bag is provided with a partition plate at one end near the anchoring section, and the partition plate is set perpendicular to the anchor rod.

[0008] Furthermore, the limiting member includes an upper limiting member and a lower limiting member. The upper limiting member is disposed at the end of the bag away from the anchoring section, and the lower limiting member is disposed at the end of the bag close to the anchoring section. The two ends of the lower limiting member are respectively connected to the isolation plate and the anchoring section.

[0009] Furthermore, the upper limit component includes a limiting plate and a fixing component. The limiting plate is disposed at the end of the bag, and the fixing component is disposed on the limiting plate. The fixing component is sleeved on the anchor rod and is used to fix the entire bag to the anchor rod.

[0010] Furthermore, the lower limit member is annular, with one end connected to an isolation plate and the other end connected to an anchoring section.

[0011] Furthermore, the limiting plate is provided with a first opening, and the first tube body is connected to the first opening for communicating with the bag. The first opening communicates with the bottom of the bag.

[0012] Furthermore, the first tube is a rigid tube.

[0013] Furthermore, the bag is provided with a fixing tube for fixing the bag to the anchor rod, the bag surrounds the fixing tube, and the bag is provided with an exhaust pipe.

[0014] As a second aspect of this application, an anchor rod for pull-out force testing of the anchoring section is disclosed, including the above-mentioned pull-out force testing device; an anchoring bladder, the anchoring bladder being disposed in the anchoring section of the anchor rod, the two ends of the anchoring bladder being provided with pressure plates for fixing the position of the anchoring bladder, and the anchoring bladder being provided with a second tube body communicating with the outside.

[0015] Furthermore, the pressure plate includes an upper pressure plate and a lower pressure plate. The upper pressure plate is disposed at one end close to the bladder. The upper pressure plate is provided with a second pipe opening. The second pipe body communicates with the anchoring bladder through the second pipe opening. The pressure plate is connected to the lower limiting member.

[0016] Furthermore, the upper bearing plate is equipped with a pressure valve, which is connected to the inside of the fixed bladder and is used to release pressure during grouting.

[0017] The implementation of the above technical solution in this application has the following beneficial effects:

[0018] This application creates a bladder between the anchorage section and the free section of the anchor rod, and injects non-hardening grease. After the surrounding concrete hardens, a gap is formed between the anchorage section and the free section, which allows for a more realistic evaluation of the anchorage force when conducting anchor pull-out force tests.

[0019] The bag in this application is made of soft material and is contracted around the anchor rod. The anchor rod passes through the middle of the bag, and the volume of the bag after it is expanded can completely fill the drill hole, which facilitates the formation of a complete gap section and completely isolates the anchored section from the free section.

[0020] This application sets the first tube body to be a rigid tube body to prevent the first tube body from being flattened and making it difficult to inject grease when the concrete is injected. In addition, the first tube opening is set to directly connect to the bottom of the bag, so that the grease can be completely extracted after the concrete has solidified.

[0021] The anchor bolt of this application can be used for pull-out force testing, and the test results are more accurate. It can fully test the anchoring force of the anchoring section. It also has a simple structure, is easy to install, has low cost, and is easy to promote widely. Attached Figure Description

[0022] Figure 1 is a structural schematic diagram of a device for testing the pull-out force of an anchor bolt anchorage section according to this application;

[0023] Figure 2 is a schematic diagram of the bladder in a flattened state after grouting of a device for testing the pull-out force of an anchor bolt anchorage section according to this application.

[0024] Figure 3 is a schematic diagram of the state in which the bag in the anchorage section pull-out force testing device of the present application is filled with filler material.

[0025] Figure 4 is a schematic diagram of the state of the device for testing the pull-out force of the anchor bolt section of the present application when the filler is extracted from the bag.

[0026] Figure 5 is a schematic diagram of the structure of a device for testing the pull-out force of an anchor bolt section according to this application after the filling material in the bladder is replaced with cement slurry.

[0027] Figure 6 is a schematic diagram of the connection between the free section and the anchoring section of a traditional anchor bolt.

[0028] Figure 7 is a schematic diagram of the structure in this application where the free section and the anchoring section are separated;

[0029] Figure 8 is a schematic diagram of the structure after the filling material in the anchor bag of this application is replaced with cement grout;

[0030] Figure 9 is a schematic diagram of a pull-out test of a device for testing the pull-out resistance of an anchor bolt anchorage section according to this application;

[0031] Figure 10 is a schematic diagram of the structure of the bag in the device for testing the pull-out force of the anchor section of the anchor bolt according to this application;

[0032] Figure 11 is a schematic diagram of the structure of the anchoring section in a device for testing the pull-out force of the anchoring section of an anchor bolt according to this application.

[0033] The labels in the figures are explained as follows:

[0034] 1. Bag, 2. First tube body, 3. Isolation plate, 4. Upper limit component, 5. Lower limit component, 6. Limiting plate, 7. Fixing component, 8. First pipe opening, 9. Anchoring bag, 10. Second tube body, 11. Upper pressure plate, 12. Lower pressure plate, 13. Pressure valve, 14. Sleeve, 15. Fixing pipe, 16. Exhaust pipe, 17. Free section L1, Anchoring section L2. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] As shown in Figures 1 to 5, the first embodiment of this application provides a device for testing the pull-out force of an anchor bolt anchorage section, including an anchor bolt, the anchor bolt including an anchorage section and a free section, characterized in that it further includes: a bag 1, the bag 1 is arranged around the anchor bolt, the bag 1 is located at the connection between the anchorage section and the free section of the anchor bolt, and the bag 1 is provided with a limiting member at least at one end away from the anchorage section;

[0039] A first tube 2, one end of which is connected to the pouch 1, is used to connect the pouch 1 to the outside.

[0040] It should be noted that by setting up a bladder 1 at the anchoring section and the free section of the anchor rod, after inserting the anchor rod into the borehole and grouting, before the concrete solidifies, grease or other oily substances are injected into the bladder 1. The oily substances expand the bladder 1 and simultaneously push the surrounding concrete towards the hole opening. After the concrete in the borehole solidifies, the oily substances are extracted from the bladder 1 through the first tube 2, forming a cavity between the anchoring section and the free section of the anchor rod. When testing the anchoring force of the anchor rod, the resistance caused by the free section of the anchor rod to the anchoring section is reduced, and the anchoring force of the anchoring section can be tested more realistically.

[0041] As a further embodiment of this invention, the bag 1 is provided with an isolation plate 3 at one end near the anchoring section, and the isolation plate 3 is set perpendicular to the anchor rod.

[0042] It should be noted that the partition plate 3 at the bottom of the bag 1 increases the load-bearing capacity of the bag 1, enabling it to support grease-like substances inside. It also limits the position of the bag 1. The size of the partition plate 3 can be slightly smaller than the drill hole size, ensuring that when grease is injected into the bag 1, it is completely blocked by the partition plate 3. The bag uses a soft material and contracts around the anchor rod, which passes through the center of the bag. The expanded volume of the bag completely fills the drill hole.

[0043] As a further implementation of this embodiment, the limiting member includes an upper limiting member 4 and a lower limiting member 5. The upper limiting member 4 is disposed at the end of the bag 1 away from the anchoring section, and the lower limiting member 5 is disposed at the end of the bag 1 close to the anchoring section. The two ends of the lower limiting member 5 are respectively connected to the isolation plate 3 and the anchoring section.

[0044] It should be noted that by setting the upper limit component 4 and the lower limit component 5, the position and size of the bag 1 are restricted to a certain area, and the distance between the upper limit component 4 and the lower limit component 5 is the length of the gap in the borehole after the oily substance is extracted. A certain length is reserved to facilitate the detection of whether the anchoring section has been pulled out during the pull-out force test.

[0045] As a further embodiment of this example, the upper limit member 4 includes a limiting plate 6 and a fixing member 7. The limiting plate 6 is disposed at the end of the bag 1, and the fixing member 7 is disposed on the limiting plate 6. The fixing member 7 is sleeved on the anchor rod and is used to fix the entire bag 1 on the anchor rod.

[0046] It should be noted that by setting the upper limit component 4, the position of the void in the borehole after the oily substance is extracted can be controlled, and by setting the limit plate 6, the oily substance can be resisted. By setting the fixing component 7, it is easy to fix the bag 1 to the anchor rod, so that the anchor rod passes through the middle of the bag 1 for easy fixation. The fixing component 7 can be a fixing ring and a clamping component. The ring can be directly sleeved on the anchor rod, and the clamping component can be clamped on the anchor rod for fixation and is equipped with a detachable lock to fasten and lock it, or it can be directly welded to the anchor rod.

[0047] As a further implementation of this embodiment, the lower limiting member 5 is annular, one end of the lower limiting member 5 is connected to the isolation plate 3, and the other end of the lower limiting member 5 is connected to the anchoring section.

[0048] It should be noted that the lower limit component 5 can be a fixing ring or a clamping component. The length of the lower limit component 5 limits the distance between the bag 1 and the anchoring section, preventing the empty section from being too far from the anchoring section, which would affect the authenticity of the anchoring force test of the anchoring section. Furthermore, the lower limit component 5 is set along the direction of the anchor rod extension, and the isolation plate 3 has a certain supporting function.

[0049] As a further embodiment of this example, the limiting plate 6 is provided with a first opening 8, the first tube body 2 is connected to the first opening 8, and is used to connect the bag 1. The first opening 8 is connected to the bottom of the bag 1.

[0050] It should be noted that the limiting plate 6 is fixed to the anchor rod, and the anchor rod passes directly through the center of the limiting plate 6. The limiting plate 6 is perpendicular to the anchor rod. The limiting plate 6 is connected to the first pipe body 2 through the first pipe opening 8. The first pipe opening 8 penetrates the limiting plate 6 and communicates with the inside of the bag 1. The first pipe opening 8 and the first pipe body 2 can be connected by threads or clamping. When concrete is injected into the borehole, it is not easy to dislodge the first pipe body 2. Connecting the first pipe opening 8 directly to the bottom of the bag 1 makes it easier to suck out all the oily substances inside the bag 1.

[0051] As a further implementation of this embodiment, the first tube 2 is a rigid tube.

[0052] It should be noted that using a rigid tube body can keep the first tube body 2 unobstructed. When drilling into the concrete, the rigid tube body will not be flattened, making it difficult for grease to enter the bladder 1. Especially after the concrete hardens, it is necessary to suck out the grease. If the first tube body 2 is flattened, it will be difficult to suck out the grease. Therefore, it is set as a rigid tube body to keep the first tube body 2 unobstructed.

[0053] As a further embodiment of this invention, the bag 1 is provided with a fixing tube 15 for fixing the bag 1 to the anchor rod. The bag 1 surrounds the fixing tube 15, and the bag is provided with an exhaust pipe 16. The fixing tube 15 on the bag 1 facilitates fixing the bag to the anchor rod; the fixing tube can be directly sleeved onto the anchor rod, making installation convenient. If reinforcement is required, additional fixing clamps or other reinforcements can be added. The exhaust pipe 16 facilitates the smooth injection of grout into the bag 1.

[0054] As shown in Figure 6, in traditional anchor bolts, the anchoring section and the free section are integrally formed. During the pull-out test, the anchoring section is subjected to an outward pull-out force while also being subjected to a compressive force from the free section on the anchoring section, resulting in an inaccurate pull-out force reading.

[0055] The second embodiment of this application provides an anchor rod for pull-out force testing of the anchoring section, including the pull-out force testing device described above; an anchoring bladder 9, the anchoring bladder 9 being disposed in the anchoring section of the anchor rod, the two ends of the anchoring bladder 9 being provided with bearing plates for fixing the position of the anchoring bladder 9, the anchoring bladder 9 being provided with a second tube 10 communicating with the outside, and the anchor rod being provided with a sleeve 14 to facilitate the isolation of the anchor rod from the surrounding concrete.

[0056] It should be noted that by setting the anchoring bladder 9 on the anchor rod to form the anchoring section, the pressure plate can easily restrict the position and shape of the anchoring bladder 9, and form a pressure isolation between the grout inside and outside the anchoring bladder 9. During the experiment, the entire test anchor rod is first placed in the borehole, and concrete is injected into the borehole. Before the concrete in the borehole solidifies, grout is injected into the anchoring bladder 9 through the second pipe 10. Then, grease is injected into the bladder 1 through the first pipe 2. The grease expands the concrete in the borehole and occupies a part of the borehole. After curing, the grout inside the anchoring bladder 9 solidifies to form the anchoring section. Then, the grease in the bladder 1 is pulled out, so that the anchoring section is not connected to the concrete of the free section at the front end in the borehole. The anchoring section is independently anchored in the borehole, which makes the anchoring force of the anchor rod more accurate when testing.

[0057] As a further embodiment of this example, the pressure plate includes an upper pressure plate 11 and a lower pressure plate 12. The upper pressure plate 11 is disposed at the end close to the bag 1. The upper pressure plate 11 is provided with a second pipe opening. The second pipe body 10 communicates with the anchoring bag 9 through the second pipe opening. The upper pressure plate 11 is connected to the lower limiting member 5. The lower pressure plate 12 is disposed at the end away from the bag 1.

[0058] It should be noted that the upper pressure plate 11 can withstand the squeezing force of the concrete above the borehole on the grout inside the anchoring bladder 9, ensuring the shape of the grout inside the bladder. The upper pressure plate 11 is provided with a second pipe opening to facilitate the connection of the second pipe body 10, which is beneficial for the second pipe body 10 to communicate with the anchoring bladder 9. The lower pressure plate 12 is provided at the bottom of the anchoring bladder 9 to support the weight of the anchoring bladder 9.

[0059] As a further embodiment of this invention, the upper pressure plate 11 is provided with a pressure valve 13, which is connected to the inside of the fixed bladder and is used to release pressure during grouting.

[0060] It should be noted that the pressure valve 13 can effectively relieve the pressure during the grouting of the anchoring bladder, which helps to ensure the stability of the anchoring bladder.

[0061] Working Principle: This device includes a bladder 1, a top pressure-bearing ring plate (upper limit component 4), a bottom pressure-bearing ring plate (lower limit component 5), a fixing pipe 15, a grouting pipe (first pipe body 2), and an exhaust pipe / grout outlet pipe. The top pressure-bearing ring plate is located at the top of the bladder, and the grouting pipe and exhaust pipe / grout outlet pipe are installed on the top pressure-bearing ring plate. The bottom pressure-bearing ring plate is located at the bottom of the bladder. The top and bottom pressure-bearing ring plates are fixed at both ends of the fixing pipe 15. This device is fixed at the boundary between the anchoring section and the free section of the anchor rod, isolating the anchoring section and the free section. This device can be fixed at the boundary between the anchoring section and the free section of the anchor rod and anchored with the anchor rod. After the anchor hole is filled with cement grout, before the cement grout sets, mud is injected into the bladder through the grouting pipe to squeeze the cement grout in the anchor hole, isolating the cement grout in the anchoring section and the cement grout in the free section of the anchor rod and forming an independent cement stone body. Then, the mud in the bladder is pumped out to form an isolation cavity. When the anchor bolt is pulled out at the anchor head to conduct an anchor bolt pull-out bearing capacity test, the pull-out bearing capacity of the anchored section can be accurately measured. This solves the problem of distorted results caused by the inclusion of the free section bearing capacity in the anchor bolt pull-out bearing capacity test results in traditional anchor bolt pull-out bearing capacity acceptance tests. After the test, cement grout can be injected through the grouting pipe to fill the sump and replace the mud slurry inside the sump to form a stone body, restoring the continuous state of the grouted stone body of the engineering anchor bolt.

[0062] Instructions for use: When conducting a pull-out test, first drill a hole, place the anchor rod in the hole, and inject concrete into the hole. Before the concrete sets, inject concrete or other anchoring grout into the anchoring bladder. After filling the bladder, inject non-solidifying grease or similar substances into the bladder. The grease will push the surrounding concrete out of the bladder. After the concrete sets, remove the grease from the bladder. This will create a gap in the grease-filled area, separating the anchored section from the free section without concrete connection. This allows for a more accurate assessment of the anchoring capacity of the anchor rod during the pull-out test.

[0063] Of course, this application may have many other implementation methods. Based on this implementation method, other implementation methods obtained by those skilled in the art without any creative effort are all within the scope of protection of this application.

Claims

1. A device for testing the pull-out force of an anchor bolt's anchorage section, comprising an anchor bolt, said anchor bolt including an anchorage section and a free section, characterized in that, Also includes: A bag (1) is arranged around the anchor rod. The bag (1) is located at the connection between the anchoring section and the free section of the anchor rod. The bag (1) is provided with a limiting element at least at one end away from the anchoring section. A first tube (2) is connected to the bag (1) at one end, and is used to connect the bag (1) to the outside.

2. The device for testing the pull-out force of an anchor bolt's anchorage section according to claim 1, characterized in that, The bag (1) is provided with an isolation plate (3) near the anchoring section, and the isolation plate (3) is set vertically to the anchor rod.

3. The device for testing the pull-out force of an anchor bolt's anchorage section according to claim 2, characterized in that, The limiting component includes an upper limiting component (4) and a lower limiting component (5). The upper limiting component (4) is located at the end of the bag (1) away from the anchoring section, and the lower limiting component (5) is located at the end of the bag (1) close to the anchoring section. The two ends of the lower limiting component (5) are respectively connected to the isolation plate (3) and the anchoring section.

4. The device for testing the pull-out force of an anchor bolt anchorage section according to claim 3, characterized in that, The upper limit member (4) includes a limiting plate (6) and a fixing member (7). The limiting plate (6) is disposed at the end of the bag (1), and the fixing member (7) is disposed on the limiting plate (6). The fixing member (7) is sleeved on the anchor rod and is used to fix the entire bag (1) on the anchor rod.

5. The device for testing the pull-out force of an anchor bolt's anchorage section according to claim 3, characterized in that, The lower limit member (5) is annular, with one end of the lower limit member (5) connected to the isolation plate (3) and the other end of the lower limit member (5) connected to the anchoring section.

6. The device for testing the pull-out force of an anchor bolt's anchorage section according to claim 4, characterized in that, The limiting plate (6) is provided with a first opening (8), the first tube body (2) is connected to the first opening (8) for connecting the bag (1), and the first opening (8) connects to the bottom of the bag (1).

7. The device for testing the pull-out force of an anchor bolt anchorage section according to claim 1, characterized in that, The bag is provided with a fixing tube (15) for fixing the bag (1) to the anchor rod. The bag (1) is surrounded by the fixing tube (15). The bag (1) is provided with an exhaust pipe (16).

8. An anchor bolt for testing the pull-out force of the anchorage section, characterized in that, The device includes the pull-out force testing device according to any one of claims 1-7; an anchoring bladder (9), wherein the anchoring bladder (9) is disposed in the anchoring section of the anchor rod, and the two ends of the anchoring bladder (9) are provided with pressure plates for fixing the position of the anchoring bladder (9), and the anchoring bladder (9) is provided with a second tube (10) communicating with the outside.

9. An anchor bolt for testing the pull-out force of the anchor bolt anchorage section according to claim 8, characterized in that, The pressure plate includes an upper pressure plate (11) and a lower pressure plate (12). The upper pressure plate (11) is located at one end close to the bag (1). The upper pressure plate (11) is provided with a second pipe opening. The second pipe body (10) is connected to the anchoring bag (9) through the second pipe opening. The upper pressure plate (11) is connected to the lower limiting member (5). The lower pressure plate (12) is located at one end away from the bag (1).

10. An anchor bolt for pull-out force testing of the anchorage section according to claim 9, characterized in that, The upper pressure plate (11) is equipped with a pressure valve (13), which is connected to the inside of the fixed bladder and is used to release pressure during grouting.

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