Anchor rod tray capable of adjusting working load of anchor rod

Abstract

The invention relates to the technical field of underground engineering support, in particular to an anchor rod tray capable of adjusting the working load of an anchor rod, which comprises an anchor rod body, and a tensioning lock, a threaded sleeve, a rotating rod and a nut tray which are sequentially and coaxially arranged at the front end of the anchor rod body; the threaded sleeve is of a two-section type cylinder structure, the upper section is a short and thick cylinder with a through hole in the outer cylindrical surface, and the lower section is a thin and long cylinder with threads on the outer cylindrical surface; the nut tray is of a three-section structure, the upper section is a cylinder internally provided with threads, the middle section is a hollow circular truncated cone, and the lower section is a sheet-shaped square base. The threaded sleeve is bolted with the nut tray through threads; the rotating rod is in a rod shape and is inserted into the through hole, and the threaded sleeve is rotated by applying torque, so that acting force is applied to the tensioning lock in the axial direction of the anchor rod body, flexible adjustment of the working load of the anchor rod is achieved, and the problems of surrounding rock instability and anchor rod breakage caused by fixing of the working load of the anchor rod are solved.

Description

Technical Field

[0001] The invention relates to the technical field of anchor rod support, and in particular to an anchor rod tray capable of adjusting the working load of the anchor rod. Background Art

[0002] As a supporting material, anchor rods are widely used in engineering fields such as subways, tunnels, mining, and slopes. According to the definition of anchor rod working load in GB / T 35056-2018 Technical Specification for Anchor Support in Coal Mine Roadways, the anchor rod working load is the axial tension received by the anchor rod during service after installation. When the surrounding rock is subjected to axial deformation or shear failure, the anchor rod working load may change. Existing anchor rods do not have the function of adjusting the anchor rod working load and cannot adapt to such load changes, which leads to problems such as surrounding rock instability, nut failure, and tray failure, which seriously affects the stability of the project. Summary of the invention

[0003] In view of this, the object of the present invention is to provide an anchor tray capable of adjusting the working load of an anchor, comprising an anchor rod body, a tension lock, a threaded sleeve, a rotating rod and a nut tray:

[0004] The tensioning lock, the threaded sleeve and the nut tray are all coaxially arranged with the anchor rod body and are sequentially installed at the front end of the anchor rod body.

[0005] Threaded sleeve: It is a two-section cylindrical shape. The upper section is a short and thick body with a through hole on the outer cylindrical surface, and the lower section is a slender cylinder with threads on the outer cylindrical surface.

[0006] Nut tray: The overall structure is three sections, the upper section is a cylinder with internal threads, the middle section is a hollow frustum, and the lower section is a sheet-like square base. The lower section of the threaded sleeve is connected to the upper section of the nut tray through threads.

[0007] Rotating rod: It is a rod-shaped structure that can be inserted into the through hole on one side of the threaded sleeve. The threaded sleeve is rotated by applying a torque, thereby applying a force to the tension lock in the axial direction of the anchor rod body.

[0008] Preferably, under the premise of meeting the requirement of exposed length of the anchor rod body, the upper section of the threaded sleeve should be as far away from the nut tray as possible, so as to reserve enough space for adjusting the working load of the anchor rod body.

[0009] Preferably, two rotating rods may be used and pass through the through hole at the same time, so as to provide sufficient torque to drive the threaded sleeve to rotate.

[0010] The beneficial effects of the present invention are as follows: (1) reducing the risk of anchor breakage and improving the bearing capacity of anchors; (2) improving the adaptability of anchors to changes in working loads; and (3) being reusable, simple in principle and easy in construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a right side view of the structure of the present invention;

[0014] Figure 3 It is the AA cross-sectional view of the present invention;

[0015] Figure 4 It is a schematic diagram of the structure of the nut tray of the present invention;

[0016] Figure 5 It is a schematic diagram of the structure of the threaded sleeve of the present invention;

[0017] Figure 6 It is a schematic diagram of a specific implementation mode of the present invention;

[0018] Figure 7 It is a schematic diagram of a second specific implementation mode of the present invention.

[0019] In the figure: 1. anchor rod body; 2. tensioning lock; 3. threaded sleeve; 31. upper section of threaded sleeve; 32. lower section of threaded sleeve; 33. first through hole; 34. second through hole; 4. rotating rod; 41. first rotating rod; 42. second rotating rod; 5. nut tray; 51. upper section of nut tray; 52. middle section of nut tray; 53. lower section of nut tray; 6. tensioning jack; 7. surrounding rock. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] like Figures 1 to 7 As shown, an anchor tray with adjustable anchor working load comprises an anchor rod body 1, a tension lock 2, a threaded sleeve 3, a rotating rod 4 and a nut tray 5; the tension lock 2, the threaded sleeve 3 and the nut tray 5 are all coaxially arranged with the anchor rod body 1 and are sequentially installed at the front end of the anchor rod body 1; the threaded sleeve 3 is in the shape of a hollow circular bolt, the upper section of the threaded sleeve is a hollow cylinder and has a first through hole 33 and a second through hole 34 on the outer side, and the lower section 32 of the threaded sleeve is a hollow rod and The outer surface is provided with threads; the nut tray 5 is square, including a flat square nut tray lower section 53, a hollow truncated cone-shaped nut tray middle section 52 and a hollow cylindrical nut tray upper section 51 with internal threads, and the threaded sleeve lower section 32 is connected to the nut tray upper section 51 by threads; the rotating rod 4 is a rod-shaped structure, which can be inserted into the first through hole 33 on one side of the threaded sleeve, and the threaded sleeve 3 is rotated by applying a torque, thereby applying a force to the tensioning lock 2 in the axial direction of the anchor rod body 1.

[0023] In this embodiment, under the premise of meeting the requirement of exposed length of the anchor rod body 1 , the threaded sleeve upper section 31 should be as far away from the nut tray upper section 51 as possible, so as to reserve enough space for adjusting the working load of the anchor rod body 1 .

[0024] In this embodiment, the first rotating rod 41 and the second rotating rod 42 can pass through the first through hole 41 and the second through hole 42 respectively, and can provide sufficient torque to drive the threaded sleeve 3 to rotate.

[0025] like Figure 6 As shown in (a) and 7(a), after a certain adjustment space is reserved between the upper section 31 of the threaded sleeve and the lower section 5 of the nut tray, the tensioning jack 6 applies a force to the tensioning lock 2, so that the anchor rod body 1 is anchored on the surrounding rock 7; when the surrounding rock 7 is subjected to the force and shrinks axially toward the anchor rod body 1 or the surface layer is sheared and broken, as shown in FIG. Figure 6As shown in (b), the lower section 53 of the nut tray is separated from the surrounding rock 7, the working load of the anchor rod body 1 is reduced, and the deformation and damage of the surrounding rock 7 cannot be suppressed; at this time, Figure 6 As shown in (c), the threaded sleeve 3 can be rotated by the first rotating rod 41 and the second rotating rod 42 to move the nut tray 5 away from the threaded sleeve upper section 31 until the nut tray lower section 53 contacts the surrounding rock 7 and reaches a certain working load. Figure 7 As shown in (b), when the surrounding rock 7 is subjected to force and continuously expands and deforms axially toward the bolt body 1, the lower section 53 of the nut tray bears a large working load, which may cause the bolt body 1 to break and fail to maintain the stability of the surrounding rock 7; at this time, if Figure 7 As shown in (c), the threaded sleeve 3 can be rotated by the first rotating rod 41 and the second rotating rod 42 to make the nut tray 5 close to the upper section 31 of the threaded sleeve, so that the surrounding rock 7 releases part of the pressure and eliminates the risk of the anchor rod body breaking.

[0026] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0027] The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anchor tray with adjustable anchor working load, characterized in that: It includes an anchor rod body, a tension lock, a threaded sleeve, a rotating rod and a nut tray, wherein: The tension lock, threaded sleeve and nut tray are all coaxially arranged with the anchor rod body and are arranged in sequence at the front end of the anchor rod body; The threaded sleeve is a two-section cylindrical structure, the upper section is a short and thick cylinder with a through hole on the outer cylindrical surface, and the lower section is a slender cylinder with a thread on the outer cylindrical surface; The nut tray is a three-section structure, the upper section is a cylinder with internal threads, the middle section is a hollow frustum, and the lower section is a sheet-like square base; The lower section of the threaded sleeve is connected to the upper section of the nut tray via threads; The rotating rod is a rod-shaped structure, which can be inserted into the through hole on one side of the threaded sleeve. The threaded sleeve is rotated by applying a torque, thereby applying a force to the tension lock along the axial direction of the anchor rod body.

2. An anchor tray with adjustable anchor working load according to claim 1, characterized in that: The inner diameter of the threaded sleeve is greater than the diameter of the anchor rod body, so as to allow the anchor rod body to pass through the threaded sleeve smoothly.

3. The anchor tray with adjustable anchor working load according to claim 1, characterized in that: The wall thickness of the upper section of the threaded sleeve is 20 mm to ensure that there is enough space for arranging the through holes.

4. The anchor tray with adjustable anchor working load according to claim 1, characterized in that: The rotating rod and the anchor rod body are perpendicular to each other in space and do not intersect each other, so as to ensure that the two do not interfere with each other during use.

5. The anchor tray with adjustable anchor working load according to claim 1, characterized in that: On the premise of meeting the requirement of exposed length of the anchor rod body, the upper section of the threaded sleeve should be as far away from the nut tray as possible, so as to reserve enough space for adjusting the working load of the anchor rod body.

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