Self-expansion spiral drilling and anchoring integrated anchor rod

Abstract

The utility model belongs to the technical field of surrounding rock support, and provides a self-expansion spiral drilling and anchoring integrated anchor rod, which comprises a rod body, a spiral blade and an elastic sheet, the screw blade is wound outside the rod body in the direction of threads, the whole screw blade is conical, the thinner end of the screw blade faces the head of the rod body, and the thicker end of the screw blade faces the tail of the rod body; the elastic pieces are arranged in gaps between the spiral blades in the radial direction, and when the spiral blades are screwed in, the elastic pieces are extruded by surrounding rock to incline towards the tail end of the rod body. Compared with a traditional anchor rod, the pulling resistance of the anchor rod is higher, the anchoring performance is remarkably improved, the anchor rod is particularly suitable for high-stress creep strata of soft rocks, and long-term stable supporting can be guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of surrounding rock support technology, specifically relating to a self-expanding spiral drilling and anchoring integrated anchor rod. Background Technology

[0002] Soft geological rock refers to a type of surrounding rock characterized by low strength, high porosity, poor cementation, significant impact from structural cutting and weathering, or the presence of large amounts of expansive clay minerals; it is loose, dispersed, soft, and weak. Anchor slippage is prone to occur during support operations in soft geological rock. The main reason for this is the weak pull-out resistance, limited functionality, and unstable anchoring force of traditional anchors.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this invention is to overcome the problem that traditional anchor bolts are prone to slippage due to the dynamic deformation of the surrounding rock during soft rock support, and to provide a self-expanding spiral drilling and anchoring integrated anchor bolt.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A self-expanding spiral drilling and anchoring integrated anchor bolt includes: a rod body, spiral blades, and an elastic plate. The rod body has a continuous external thread. The spiral blades are wound around the outside of the rod body along the direction of the thread, and the spiral blades are generally conical. The thinner end of the spiral blades faces the head of the rod body, and the thicker end of the spiral blades faces the tail of the rod body. The elastic plate is radially disposed in the inter-blade gap of the spiral blades. When the spiral blades are spiraling, the elastic plate is squeezed by the surrounding rock and tilts towards the tail of the rod body.

[0007] In the self-expanding spiral drilling and anchoring integrated anchor bolt described above, preferably, the front end of the bolt body is externally threaded with a tapered head.

[0008] Preferably, a tapered plug is threaded onto the tail end of the rod, with the tip of the tapered plug facing the head of the rod and the thicker end facing the tail end of the rod.

[0009] Preferably, the helical blade is located between the cone and the conical plug, so that the front and rear ends of the helical blade are respectively limited by the cone and the conical plug.

[0010] Preferably, a tray is provided behind the conical plug, and the center of the tray is fitted onto the outside of the rod.

[0011] Preferably, a nut is provided at the rear of the tray, and the nut is threaded onto the outside of the rod.

[0012] Preferably, both the rod and the cone are hollow.

[0013] Beneficial effects: This utility model has stronger pull-out resistance and significantly improved anchoring performance, making it particularly suitable for soft rock formations with high stress creep, ensuring long-term stable support. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0015] Figure 1 This is a schematic diagram illustrating the practical application of this utility model;

[0016] Figure 2 This is a front view schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0018] In the diagram: 1. Rod; 2. Helical blade; 3. Elastic plate; 4. Cone; 5. Conical plug; 6. Tray; 7. Nut. Detailed Implementation

[0019] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0020] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected" and "linked" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] This embodiment aims to provide a self-expanding spiral drilling and anchoring integrated anchor rod, whose main function is to provide long-term stable support for soft rock and prevent anchor rod slippage.

[0023] Reference Figures 1-3 The device includes: a rod body 1, a spiral blade 2, and an elastic plate 3. The rod body 1 has a continuous external thread, and a cone head 4 is threaded onto the front end of the rod body 1. Both the rod body 1 and the cone head 4 are hollow to facilitate grouting into the rock strata. The cone head 4 facilitates drilling the rod body 1 into the soft rock strata, thereby reducing the drilling resistance of the rod body 1. The cone head 4 is made of hard alloy. A conical plug 5 is threaded onto the tail end of the rod body 1. The conical plug 5 is made of rubber, with the tip of the conical plug 5 facing the head of the rod body 1 and the thicker end of the conical plug 5 facing the tail end of the rod body 1. The conical plug 5 can stop the grouting and ensure the sealing between the tail end of the rod body 1 and the surrounding rock.

[0024] The spiral blade 2 is wound around the outside of the rod body 1 along the direction of the thread. Specifically, the spiral blade 2 is wound from the rear end of the rod body 1 towards the front end along the direction of the thread. That is to say, the spiral blade 2 and the external thread of the rod body 1 have the same direction of rotation and pitch. This method can quickly install the spiral blade 2 on the outside of the rod body 1. If the anchor rod is recycled, the spiral blade 2 can be quickly replaced if it is damaged to save costs and ensure timely deployment in soft rock support. On the other hand, it can ensure the firmness of the connection between the spiral blade 2 and the rod body 1. The spiral blade 2 is located between the cone head 4 and the conical plug 5, so that the front and rear ends of the spiral blade 2 are limited by the cone head 4 and the conical plug 5 respectively, ensuring the stability of the spiral blade 2 when it is screwed in.

[0025] In this embodiment, the spiral blade 2 is generally conical. The thinner end of the spiral blade 2 faces the head of the rod 1, and the thicker end of the spiral blade 2 faces the tail of the rod 1. The end that spirals into the rock stratum is the thinner end of the spiral blade 2. The purpose is to reduce the frictional resistance encountered by the spiral blade 2 when it spirals in, thereby ensuring the propulsion efficiency of the spiral blade 2 in the rock stratum. Gradually increasing the diameter of the spiral blade 2 towards its tail end can effectively enhance the pull-out resistance of the spiral blade 2 to cope with high-stress creep strata such as soft rock.

[0026] The elastic plate 3 is radially disposed within the inter-blade gap of the helical blade 2. When the helical blade 2 rotates forward, the elastic plate 3 is compressed by the surrounding rock and tilts towards the tail end of the rod 1. Specifically, the elastic plate 3 can be a shape memory alloy sheet, which can be directly welded to the rod 1, and the external threads of the elastic plate 3 and the rod 1 are offset, thus not affecting the installation of the helical blade 2. In a static state, the elastic plate 3 is completely perpendicular to the rod 1. Its working state is related to the rotation of the helical blade 2 within the rock strata. When the helical blade 2 rotates forward… Due to the pressure of the rock strata and the influence of the spiral blade's rotation direction, the elastic plate 3 will inevitably tilt towards the tail end of the rod body 1. When the spiral blade 2 is rotated to the appropriate position, it will be rotated out, that is, the spiral blade 2 will be slightly retracted a little distance. Before this, the end of the elastic plate 3 has already pressed against the rock strata according to its own rebound characteristics. If the spiral blade 2 retracts, the elastic plate 3 will inevitably be inserted into the rock strata or rock fissures. After the grouting is completed and the rock fissures are filled and reinforced, the entire anchor rod will inevitably be firmly anchored in the rock strata.

[0027] A tray 6 is provided behind the conical plug 5. The tray 6 is made of steel. The center of the tray 6 is fitted onto the outside of the rod 1. A nut 7 is provided behind the tray 6. The nut 7 is threaded onto the outside of the rod 1. By rotating the nut 7, the tray 6 is pressed to fix the rod 1 in the rock layer.

[0028] In practical use, the cone head 4, the spiral blade 2, and the conical plug 5 are installed in sequence. The orifice at the tail end of the rod body 1 adopts a plum blossom-shaped plug-in structure to quickly connect with the output end of the drilling rig. Then, the drilling rig drives the anchor rod to rotate into the rock layer. During this process, the spiral blade 2 will cut into the surrounding rock layer. After the anchor rod reaches the specified depth of the rock layer, a reverse rotation operation is performed so that the alloy plate also cuts into the rock layer or the rock layer fissure. Then, grout can be injected into the hollow cavity of the rod body 1. After the grouting is completed, the nut 7 at the tail end of the rod body 1 is tightened, and the tray 6 is stably attached to the rock layer.

[0029] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be within the scope of protection of the pending claims of the present utility model.

Claims

1. A self- expanding, helical, drilling, anchoring, integrated anchor rod, characterized in that, include: Rod body, with external through-thread; A helical blade is wound around the outside of the rod in the direction of a thread, and the helical blade is generally conical. The thinner end of the helical blade faces the head of the rod, and the thicker end of the helical blade faces the tail of the rod. An elastic sheet is radially disposed within the inter-blade gap of the helical blade. When the helical blade rotates, the elastic sheet is squeezed by the surrounding rock and tilts towards the tail end of the rod.

2. Self-anchoring auger-in-one from claim 1, characterized in that, A cone head is threaded onto the front end of the rod.

3. Self-anchoring auger-in-one from claim 2, characterized in that, The tail end of the rod is threaded with a tapered plug, the tip of which faces the head of the rod and the thicker end faces the tail end of the rod.

4. Self-anchoring auger-in-one from claim 3, characterized in that, The helical blade is located between the cone and the conical plug, so as to limit the front and rear ends of the helical blade by the cone and the conical plug respectively.

5. Self-anchoring auger-in-one from claim 4, characterized in that, A tray is provided behind the conical plug, and the center of the tray is fitted onto the outside of the rod.

6. Self-anchoring auger-in-one from claim 5, characterized in that, A nut is provided at the rear of the tray, and the nut is threaded onto the outside of the rod.

7. Self-anchoring auger-in-one from claim 6, characterized in that, Both the rod and the cone are hollow.

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