Size-variable surrounding rock anchor rod drawing experiment box

Abstract

The utility model discloses a size-variable surrounding rock anchor rod drawing experiment box which comprises an external rectangular frame, an internal rectangular frame, a lengthened plate and a top plate, a groove is vertically formed in at least one side wall of the built-in rectangular frame; the lower part of the internal rectangular frame is partially inserted into the external rectangular frame; the upper portion of the lengthening plate is installed in the groove, and the lower portion of the lengthening plate is connected with one first connecting hole through a bolt. Two sliding grooves are formed in the top of the built-in rectangular frame, groove openings of the two sliding grooves are oppositely formed, the top plate is horizontally arranged in the two sliding grooves in a pluggable mode, and a first hanging ring is arranged at the top of the top plate. The built-in rectangular frame is telescopically arranged in the external rectangular frame, and the combination form of the external rectangular frame and the built-in rectangular frame is fixed through the lengthening plate, so that the surrounding rock anchor rod drawing test box with the required size is finally obtained, and the surrounding rock anchor rod drawing test box is adaptive to anchor rod drawing test scenes with various capacity requirements.

Description

Technical Field

[0001] This utility model relates to the field of anchor bolt testing technology, and in particular to a variable-size rock anchor bolt pull-out test box. Background Technology

[0002] As a fundamental component of initial tunnel support, rock bolts play a crucial role in reinforcing and enhancing the bearing capacity of the surrounding rock. With tunnel construction becoming increasingly longer, larger, more challenging, and deeper, complex geological conditions frequently lead to rock bolt failure and rapid attenuation of anchoring force, severely impacting project safety. Therefore, conducting indoor rock bolt pull-out tests is essential to elucidate the load transfer mechanism and failure modes during the pull-out process. However, existing equipment has fixed internal dimensions, making it unsuitable for various capacity requirements in rock bolt pull-out tests. This reduces the utilization rate of components and increases the cost of rock bolt pull-out testing.

[0003] Therefore, it is necessary to develop a variable-size rock anchor pull-out test chamber to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to design a variable-size rock anchor pull-out test box to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A variable-size rock anchor pull-out test chamber includes:

[0007] An external rectangular frame; the external rectangular frame is formed as a rectangular ring structure with an empty interior; at least one side wall of the external rectangular frame is provided with a set of first connecting holes, the set of first connecting holes including a plurality of uniformly spaced first connecting holes arranged vertically along a straight line.

[0008] Built-in rectangular frame; the built-in rectangular frame is formed as a rectangular ring structure with an empty interior and a base plate; at least one side wall of the built-in rectangular frame has a vertical groove; the lower part of the built-in rectangular frame is inserted into the outer rectangular frame.

[0009] Extension plate; the upper part of the extension plate is installed in the groove, and the lower part of the extension plate is connected to a first connecting hole by bolts;

[0010] Top plate; the top of the built-in rectangular frame is provided with two sliding grooves, the openings of the two sliding grooves are set opposite each other, the top plate is horizontally and pluggably placed in the two sliding grooves, and the top of the top plate is provided with a first lifting ring.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. By setting an internal rectangular frame that can be extended within an external rectangular frame, and fixing the combination of the external and internal rectangular frames with an extension plate, a rock bolt pull-out test box of the required size is finally obtained, making it suitable for various anchor bolt pull-out test scenarios with different capacity requirements. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is the front view of the external rectangular frame in this utility model;

[0015] Figure 3 This is a schematic diagram of the extended plate in this utility model;

[0016] The names corresponding to the reference numerals in the attached figures are:

[0017] In the diagram: 1-External rectangular frame, 11-First connecting hole, 2-Internal rectangular frame, 3-Extension plate, 31-Second connecting hole, 32-Third connecting hole, 33-Fourth connecting hole, 4-Fixing fastener, 41-Straight plate, 42-L-shaped plate, 5-First lifting ring, 6-Top plate, 7-Slide groove, 8-Connecting plate, 9-Second lifting ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] like Figure 1-3 As shown, a variable-size rock anchor pull-out test chamber includes:

[0026] An external rectangular frame 1 is formed as a rectangular ring structure with an empty interior. A set of first connecting holes 11 is provided on each of the three side walls of the external rectangular frame 1. The set of first connecting holes 11 includes six evenly spaced first connecting holes 11 arranged vertically along a straight line.

[0027] Built-in rectangular frame 2; The built-in rectangular frame 2 is formed as a rectangular ring structure with an empty interior and a base plate; Grooves are vertically provided on the three side walls of the built-in rectangular frame 2; The lower part of the built-in rectangular frame 2 is inserted into the outer rectangular frame 1.

[0028] Extension plate 3; the upper part of extension plate 3 is installed in the groove, and the lower part of extension plate 3 is connected to a first connecting hole 11 by bolts (by selecting different heights of the first connecting hole 11, the combined height of the outer rectangular frame 1 and the inner rectangular frame 2 can be changed, thereby adjusting the overall volume of the outer rectangular frame 1 and the inner rectangular frame 2).

[0029] Top plate 5; The top of the built-in rectangular frame 2 is provided with two sliding grooves 7, the openings of the two sliding grooves 7 are arranged opposite each other, the top plate 5 is horizontally and pluggably placed in the two sliding grooves 7, and the top of the top plate 5 is provided with a first lifting ring 5.

[0030] like Figure 1 As shown, a second lifting ring 8 is provided on the side wall of the external rectangular frame 1.

[0031] like Figure 1 As shown, the upper end of the built-in rectangular frame 2 is provided with three connecting plates 8, and the upper end of the extension plate 3 is connected to the connecting plates 8.

[0032] like Figure 1-3 As shown, the upper end of the extension plate 3 is provided with a second connecting hole 31, a third connecting hole 32, and a fourth connecting hole 33 respectively from the upper end to the lower end. The connecting plate 8 is provided with a fifth connecting hole, and the lower end of the groove is provided with a sixth connecting hole. The upper end of the extension plate 3 is connected to the connecting plate 8 by bolts passing through the second connecting hole 31 and the fifth connecting hole. The lower end of the extension plate 3 is connected to the lower end of the groove by bolts passing through the third connecting hole 32 and the sixth connecting hole. The lower end of the extension plate 3 is connected to the external rectangular frame 1 by bolts passing through a first connecting hole 11 and a fourth connecting hole 33.

[0033] like Figure 1-2 As shown, the four side walls of the outer rectangular frame 1 and the inner rectangular frame 2 are connected by at least one fastener 4, and the bottom plate of the outer rectangular frame 1 is fixedly connected to one side plate. The side walls of the inner rectangular frame 2 are only connected to each other at the top by fasteners 4.

[0034] like Figure 1 As shown, the fixing fastener 4 includes a straight plate 41, an L-shaped plate 42, and two side connections of the outer rectangular frame 1. The first end of the straight plate 41 is connected to one side, the first end of the L-shaped plate 42 is connected to the other side, and the second end of the straight plate 41 and the second end of the L-shaped plate 42 are connected by bolts. In this application, by removing the fixing fastener 4, only one side wall of the outer rectangular frame 1 and the inner rectangular frame 2 can be opened to clean the internal filling material, which is very convenient.

[0035] A test method for a variable-size rock anchor pull-out test chamber, the method comprising the following steps:

[0036] S1. Determine the height of the test model. First, install the outer rectangular frame 1 using the fasteners 4. Then, install the top plate 5 of the inner rectangular frame 2 (insert the top plate into the two sliding grooves 7). Use the first lifting ring 5 to hoist the inner rectangular frame 2 into the outer rectangular frame 1. Select the corresponding extension plate 3 according to the test design height. Connect the outer rectangular frame 1, extension plate 3, and inner rectangular frame 2 with bolts. Then, assemble the inner rectangular frame 2 using the fasteners 4. Finally, use the second lifting ring 8 on the side wall of the outer rectangular frame 1 to hoist the device to the designated test location.

[0037] S2. Disassemble the top plate 5 of the built-in rectangular frame 2, place the steel pipe inside the built-in rectangular frame 2, and place the anchor rods through the reserved holes. Fill the frame with test soil and rock and arrange monitoring components. After filling, remove the steel pipe, grout the reserved holes, and place the anchor rods. After the grout solidifies, place the pad, jack, and nut in sequence. Apply tension to the anchor rods using a gradient loading method. After each gradient is applied, wait for the system to stabilize before collecting test data. Then continue to apply the next level of load until the anchor rods experience significant displacement or are completely pulled out.

[0038] S3. After the test, hoist the device to the test soil and rock recovery point, remove the bolts connecting the external rectangular frame 1, the extension plate 3 and the internal rectangular frame 2 on any side, then remove the fixing fasteners 4 of the external rectangular frame 1 and the internal rectangular frame 2 on the same side of the device, remove the model soil and rock inside the device, remove the remaining connecting bolts and remove the fixing fasteners 4, and put the external rectangular frame 1 and the internal rectangular frame 2 back in place.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A variable-size rock anchor pull-out test chamber, characterized in that, include: An external rectangular frame; the external rectangular frame is formed as a rectangular ring structure with an empty interior; at least one side wall of the external rectangular frame is provided with a set of first connecting holes, the set of first connecting holes including a plurality of uniformly spaced first connecting holes arranged vertically along a straight line. Built-in rectangular frame; the built-in rectangular frame is formed as a rectangular ring structure with an empty interior and a base plate; at least one side wall of the built-in rectangular frame has a vertical groove; the lower part of the built-in rectangular frame is inserted into the outer rectangular frame. Extension plate; the upper part of the extension plate is installed in the groove, and the lower part of the extension plate is connected to a first connecting hole by bolts; Top plate; the top of the built-in rectangular frame is provided with two sliding grooves, the openings of the two sliding grooves are set opposite each other, the top plate is horizontally and pluggably placed in the two sliding grooves, and the top of the top plate is provided with a first lifting ring.

2. The variable-size rock anchor pull-out test box according to claim 1, characterized in that, A second lifting ring is provided on the side wall of the external rectangular frame.

3. The variable-size rock anchor pull-out test chamber according to claim 1, characterized in that, The upper end of the built-in rectangular frame is provided with at least one connecting plate, and the upper end of the extension plate is connected to the connecting plate.

4. The variable-size rock anchor pull-out test box according to claim 3, characterized in that, The extension plate has a second connecting hole, a third connecting hole, and a fourth connecting hole from its upper end to its lower end. The connecting plate has a fifth connecting hole, and the lower end of the groove has a sixth connecting hole. The upper end of the extension plate is connected to the connecting plate by bolts passing through the second connecting hole and the fifth connecting hole. The lower end of the extension plate is connected to the lower end of the groove by bolts passing through the third connecting hole and the sixth connecting hole. The lower end of the extension plate is connected to the external rectangular frame by bolts passing through a first connecting hole and a fourth connecting hole.

5. The variable-size rock anchor pull-out test chamber according to claim 1, characterized in that, The four side walls of the external rectangular frame and the internal rectangular frame are connected by at least one fastener, and the bottom plate of the external rectangular frame is fixedly connected to one side plate.

6. The variable-size rock anchor pull-out test chamber according to claim 5, characterized in that, The fasteners include a straight plate, an L-shaped plate, and two side connections of the external rectangular frame. The first end of the straight plate is connected to one side, the first end of the L-shaped plate is connected to the other side, and the second end of the straight plate is connected to the second end of the L-shaped plate by bolts.

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