Multi-section thermal expansion type expansion anchor rod

Abstract

The utility model discloses a multi-section thermal expansion type expansion anchor rod, which relates to the field of anchor rods, and adopts the technical scheme that the multi-section thermal expansion type expansion anchor rod comprises a rod body, an expansion body and an extrusion pipe, an anchor head is arranged at the rear end of the rod body, the expansion bodies are distributed on the front section of the rod body, the front end faces of the expansion bodies are fixed relative to the rod body, and outer wings are outwards arranged on the peripheries of the expansion bodies. The inner diameter of the extrusion pipe is larger than the overall outer diameter of the expansion body, an inner wing corresponding to the outer wing is inwards arranged on a front end opening of the extrusion pipe, the outer wing and the inner wing are staggered, the extrusion pipe is pushed, and the inner wing crosses the outer wing. The multiple thermal expansion bodies are subjected to shaping extrusion through one extrusion pipe, the extension forming effect of the thermal expansion bag is improved, the anti-drawing strength of the anchor rod is greatly improved, the expansion structure is locked during construction, and the structure is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the field of anchor rods, in particular to a multi-section thermal expansion type expansion anchor rod. Background Art

[0002] In tunnel and slope engineering, anchor rods are widely used as an economical and affordable construction tool. In the current field of anchor rod anchoring technology, anchor rods are usually solid threaded rods, or anchor cables are used to reinforce fractured rock mass. The common method is to drill a hole with a drill bit, then directly place the anchor rod in the anchor hole and grout it, and use the friction between the anchor rod and the grouting body to achieve reinforcement of the fractured rock mass. At present, there are related schemes that use radial expansion anchor rods, such as the radial expansion extrusion anchor rod disclosed in the patent document of announcement number CN113586114A. This scheme uses a pulling component and an expansion component to pull, expand and lock the hole wall when the soil deforms in the later stage. In fact, this scheme has a major disadvantage when used, because the expansion structure of this scheme takes effect when the soil deforms. In fact, the soil is loose at this time. If there is an internal structure that generates expansion force, it will not only fail to lock well, but may also cause the soil to loosen further, and the anchoring effect cannot be achieved. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a multi-section thermal expansion expansion anchor rod, which uses an extrusion tube to shape and extrude multiple thermal expansion bodies, improves the extension and molding effect of the thermal expansion bag, greatly improves the tensile strength of the anchor rod, and the expansion structure is locked during construction, and the structure is stable and reliable.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a multi-section thermal expansion type expansion anchor rod, comprising a rod body, an expansion body and an extrusion tube;

[0005] The rear end of the rod body is provided with an anchor head, a plurality of the expansion bodies are distributed at the front end of the rod body, the front end surface of the expansion body is fixed relative to the rod body, and the periphery of the expansion body is provided with outer wings outwardly;

[0006] The inner diameter of the extruded tube is larger than the overall outer diameter of the expansion body. The front end of the extruded tube is provided with an inner wing corresponding to the outer wing. The outer and inner wings are staggered and the extruded tube is pushed so that the inner wing will cross over the outer wing.

[0007] When in use, the expansion bodies are distributed at a certain distance on the front section of the rod body, wherein the extrusion tube is sleeved on the rear section of the rod body, and then the whole is sent into the drill hole.

[0008] If the outer wing and the inner wing are aligned, the front end of the extrusion tube cannot cross the expansion body. In this state, the extrusion tube can be pushed so that the rear end of the expansion body is pushed forward. The expansion body is squeezed and expanded outward, thereby forming an expansion structure with a larger outer diameter, achieving the anchoring effect.

[0009] If the outer wing and the inner wing are staggered, the extrusion tube can push the inner wing across the outer wing to the front, that is, after the rod body and the expansion body are put into the borehole, by staggering the outer wing and the inner wing, the front end (inner wing) of the extrusion tube is sequentially crossed over the expansion body to reach the rear of the expansion body in the front, and the angle of the extrusion tube is adjusted so that the inner wing of the extrusion tube is aligned with the outer wing of the expansion body in the front, and the extrusion tube is pushed forward so that the rear end of the expansion body is squeezed and the expansion body forms an expansion structure with a larger outer diameter. After the first expansion body is expanded, the extrusion tube is moved backward so that the extrusion tube is pushed back to between the first expansion body and the second expansion body, and slurry is injected between the two adjacent expansion bodies through the extrusion tube. After the slurry injection is completed, the extrusion tube is moved to the rear of the second expansion body (between the second expansion body and the third expansion body), and the outer wing of the second expansion body is aligned with the inner wing of the extrusion tube, and the extrusion tube is pushed forward so that the second expansion body completes the extrusion and expansion, and then the slurry injection and the extrusion of the next expansion body are circulated in sequence. Finally, all expansion bodies are extruded and expanded.

[0010] Preferably, the expansion body comprises a fixing plate, an expansion metal cylinder and a rear abutment plate;

[0011] The fixing plate is connected to the front end of the expansion metal cylinder, and the rear end of the expansion metal cylinder is connected to the rear abutment plate;

[0012] The rod body is passed through the rear support plate, the expansion metal cylinder and the fixing plate in sequence. The rear support plate is slidably fitted relative to the rod body. The outer wing is located on the rear support plate. The fixing plate is fixed to the rod body.

[0013] The expansion metal tube is squeezed by the cooperation of the fixed plate and the rear abutment plate, which can well realize the squeezing of the expansion metal and is more convenient to operate.

[0014] Preferably, a heating wire is provided in the expansion metal cylinder, so that the hardness of the expansion metal cylinder can be softened by heating, making it easier for the expansion to be realized.

[0015] Preferably, each of the heating wires is electrically connected to an external controller via a wiring harness, so as to facilitate unified control of the activation of the heating wires.

[0016] Preferably, the rear plate, the expansion metal cylinder and the fixed plate are connected to each other using hot melt resin, which facilitates the temporary determination of the relative positions of the rear plate, the expansion metal cylinder and the fixed plate, and allows for easy expansion by subsequent heating.

[0017] Preferably, a protrusion with a higher center and lower periphery is provided on the front end of the rear support plate corresponding to the rear end of the expansion metal tube. The protrusion can squeeze the middle of the expansion metal tube outward to form an umbrella-like hook structure, thereby improving the stability of the anchoring.

[0018] Preferably, the front end surface of the inner wing is larger than the outer wing, and the front end surface of the inner wing is provided with a groove adapted to the outer wing, so that the inner and outer wings can be kept aligned when they are pushed together to avoid sliding apart, and the rear abutment plate can be pushed more stably.

[0019] Preferably, the bottom of the groove is provided with a plurality of dot-shaped particle protrusions, which can increase the friction force and prevent the inner wing and the outer wing from sliding apart.

[0020] Preferably, the outer wings are evenly arranged on the rear abutment plate so that a more balanced extrusion force can be applied to the rear abutment plate when pushing.

[0021] Preferably, a force-bearing disk is provided outwardly at the rear end of the extruded tube, which makes it more convenient to use a pressure device to act on the force-bearing disk, thereby pushing the extruded tube forward.

[0022] Beneficial effects of the utility model:

[0023] This solution has a simple structure, strong applicability and convenient construction. It uses an extrusion tube to shape and extrude multiple thermal expansion bodies, so that the materials and equipment can be reused and the forming effect can be controlled. The anchor rod is a hollow structure as a whole, which can be constructed in sections with pressure grouting. The grouting pressure forms a pressure cavity between the thermal expansion bags, continues to extrude the deformed metal, improves the extension and forming effect of the thermal expansion bags, and greatly improves the tensile strength of the anchor rod. The expansion structure is locked during construction, and the structure is stable and reliable, meeting the construction requirements of complex strata. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only six of the drawings of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic diagram of a multi-section thermal expansion anchor structure of the present invention.

[0026] Figure 2 Schematic diagram of the structure of the expansion anchor after deformation;

[0027] Figure 3 is a schematic cross-sectional view of a thermal expansion bladder;

[0028] Figure 4Schematic diagram of the shape plate;

[0029] Figure 5 is a schematic diagram of the cross section of the shaping plate;

[0030] Figure 6 Schematic diagram of the extruded tube end.

[0031] In the figure, 1. fixing plate; 2. expansion metal cylinder; 3. heating wire; 4. rear plate; 5. outer wing; 6. protrusion; 7. rod body; 8. slurry; 9. extrusion tube; 10. inner wing; 11. groove; 12. force plate; 13. controller; 14. anchor head. DETAILED DESCRIPTION

[0032] In order to deepen the understanding of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0033] Example

[0034] like Figure 1 As shown, a multi-section thermal expansion type expansion anchor includes a rod body 7, an expansion body and an extrusion tube 9;

[0035] The rear end of the rod body 7 is provided with an anchor head 14, and a plurality of expansion bodies are distributed at the front end of the rod body 7. The front end surface of the expansion body is fixed relative to the rod body 7. Figure 4 As shown, the outer periphery of the expansion body is provided with outer wings 5 ​​outwardly;

[0036] The inner diameter of the extruded tube 9 is larger than the overall outer diameter of the expansion body. The front end of the extruded tube 9 is provided with an inner wing 10 inwardly corresponding to the outer wing 5. The outer wing 5 and the inner wing 10 are staggered and the extruded tube 9 is pushed, and the inner wing 10 will cross the outer wing 5.

[0037] When in use, the expansion bodies are distributed at a certain distance on the front section of the rod body 7, wherein the extrusion tube 9 is sleeved on the rear section of the rod body 7, and then the whole is sent into the drill hole.

[0038] Combine Figure 2 As shown, if the outer wing 5 and the inner wing 10 are aligned, the front end of the extrusion tube 9 cannot cross the expansion body. In this state, the extrusion tube 9 can be pushed so that the rear end of the expansion body is pushed forward, and the expansion body is squeezed and expanded outward, thereby forming an expansion structure with a larger outer diameter, achieving the effect of anchoring.

[0039] If the outer wing 5 and the inner wing 10 are staggered, the extrusion tube 9 can push the inner wing 10 to cross the outer wing 5 to the front, that is, after the rod body 7 and the expansion body are sent into the borehole, by staggering the outer wing 5 and the inner wing 10, the front end of the extrusion tube 9 (the inner wing 10) is sequentially crossed over the expansion body to the rear of the expansion body at the front, and the angle of the extrusion tube 9 is adjusted so that the inner wing 10 of the extrusion tube 9 is aligned with the outer wing 5 of the expansion body at the front, and the extrusion tube 9 is pushed forward, combined with the outer wing 5 of the expansion body at the front. Figure 2 As shown, the rear end of the expansion body is squeezed to form an expansion structure with a larger outer diameter. After the first expansion body is expanded, the extrusion tube 9 is moved backward so that the extrusion tube 9 is pushed back to the position between the first expansion body and the second expansion body, and the slurry 8 is injected into the space between the two adjacent expansion bodies through the extrusion tube 9. After the slurry 8 is injected, the extrusion tube 9 is moved to the rear of the second expansion body (between the second expansion body and the third expansion body), and the outer wing 5 of the second expansion body and the inner wing 10 of the extrusion tube 9 are aligned, and the extrusion tube 9 is pushed forward so that the second expansion body is extruded and expanded, and then the slurry 8 is injected and extruded in the next expansion body in a cycle. Finally, all the expansion bodies are extruded and expanded.

[0040] The expansion body includes a fixed plate 1, an expansion metal cylinder 2 and a rear abutment plate 4;

[0041] The fixing plate 1 is connected to the front end of the expansion metal cylinder 2, and the rear end of the expansion metal cylinder 2 is connected to the rear abutment plate 4;

[0042] The rod body 7 passes through the rear support plate 4, the expansion metal cylinder 2 and the fixed plate 1 in sequence forward, the rear support plate 4 slides relative to the rod body 7, the outer wing 5 is located on the rear support plate 4, and the fixed plate 1 is fixed to the rod body 7.

[0043] By cooperating with the fixed plate 1 and the rear abutment plate 4 to squeeze the expanded metal tube 2, the expanded metal can be squeezed well, and the operation is more convenient.

[0044] Combine Figure 3 As shown, a heating wire 3 is installed within the expansion metal tube 2. Heating softens the expansion metal tube 2, facilitating expansion. The material of the expansion metal tube 2 is not strictly required; metals with good ductility are preferred, and iron is also acceptable. Axial cut lines are provided on the sidewalls of the expansion metal tube 2 to facilitate expansion.

[0045] Each of the heating wires 3 is electrically connected to an external controller 13 via a wiring harness, so as to facilitate unified control of the start-up of the heating wires 3 .

[0046] The rear plate 4, the expansion metal cylinder 2 and the fixed plate 1 are connected to each other by hot-melt resin, so that the relative positions of the rear plate 4, the expansion metal cylinder 2 and the fixed plate 1 can be temporarily determined, and expansion can be easily achieved by heating later.

[0047] Combine Figure 5 As shown, the front end of the rear support plate 4 is provided with a protrusion 6 with a high center and a low periphery at the front end corresponding to the rear end of the expanded metal tube 2. The protrusion 6 can squeeze the middle part of the expanded metal tube 2 outward to form a barbed structure similar to an umbrella, thereby improving the stability of the anchoring.

[0048] Combine Figure 6 As shown, the front end surface of the inner wing 10 is larger than the outer wing 5, and the front end surface of the inner wing 10 is provided with a groove 11 adapted to the outer wing 5. When the inner wing 10 and the outer wing 5 are aligned and pushed, the alignment between the two can be maintained to prevent them from sliding apart, and the rear abutment plate 4 can be pushed more stably.

[0049] The bottom of the groove 11 is provided with a plurality of dot-shaped particle protrusions 6, which can increase the friction force and prevent the inner wing 10 and the outer wing 5 from sliding apart.

[0050] The outer wings 5 ​​are evenly arranged on the rear abutment plate 4 so that a more balanced extrusion force can be applied to the rear abutment plate 4 when pushing.

[0051] The rear end of the extruded tube 9 is provided with a force disc 12 outwardly. It is more convenient to use a pressurizing device to act on the force disc 12, thereby pushing the extruded tube 9 to move forward.

[0052] Beneficial effects of the utility model:

[0053] This solution has a simple structure, strong applicability, and is easy to construct. It uses an extrusion tube 9 to shape and extrude multiple thermal expansion bodies, so that the materials and equipment can be reused and the forming effect can be controlled. The anchor rod is a hollow structure as a whole, which can be constructed in sections with pressure grouting. The grouting pressure forms a pressure cavity between the thermal expansion bags, continues to extrude the deformed metal, improves the extension and forming effect of the thermal expansion bags, and greatly improves the tensile strength of the anchor rod. The expansion structure is locked during construction, and the structure is stable and reliable, meeting the construction requirements of complex formations.

[0054] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A multi-stage thermal expansion anchor, characterized in that: It comprises a rod body (7), an expansion body and an extrusion tube (9); The rear end of the rod body (7) is provided with an anchor head (14), a plurality of expansion bodies are distributed at the front section of the rod body (7), the front end surfaces of the expansion bodies are fixed relative to the rod body (7), and the periphery of the expansion bodies is provided with outer wings (5); The inner diameter of the extruded tube (9) is larger than the overall outer diameter of the expansion body, and the front end of the extruded tube (9) is provided with an inner wing (10) inwardly corresponding to the outer wing (5). When the outer wing (5) and the inner wing (10) are staggered and the extruded tube (9) is pushed, the inner wing (10) will cross over the outer wing (5).

2. The multi-stage thermal expansion anchor according to claim 1, characterized in that: The expansion body comprises a fixed plate (1), an expansion metal cylinder (2) and a rear abutment plate (4); The fixing plate (1) is connected to the front end of the expansion metal cylinder (2), and the rear end of the expansion metal cylinder (2) is connected to the rear abutment plate (4); The rod body (7) is sequentially penetrated by the rear support plate (4), the expansion metal cylinder (2) and the fixed plate (1) in a forward direction; the rear support plate (4) is slidably fitted relative to the rod body (7); the outer wing (5) is located on the rear support plate (4); and the fixed plate (1) is fixed to the rod body (7).

3. The multi-stage thermal expansion anchor according to claim 2, characterized in that: A heating wire (3) is provided in the expansion metal cylinder (2).

4. The multi-stage thermal expansion anchor according to claim 3, characterized in that: Each of the heating wires (3) is electrically connected to an external controller (13) via a wiring harness.

5. The multi-stage thermal expansion anchor according to claim 2, characterized in that: The rear abutment plate (4), the expansion metal cylinder (2) and the fixing plate (1) are connected to each other using hot-melt resin.

6. The multi-stage thermal expansion anchor according to claim 5, characterized in that: A protrusion (6) with a higher middle and lower periphery is provided on the front end surface of the rear abutment plate (4) corresponding to the rear end of the expansion metal cylinder (2).

7. The multi-stage thermal expansion anchor according to claim 2, characterized in that: The front end surface of the inner wing (10) is larger than the outer wing (5), and the front end surface of the inner wing (10) is provided with a groove (11) adapted to the outer wing (5).

8. The multi-stage thermal expansion anchor according to claim 7, characterized in that: The outer wings (5) are evenly arranged on the rear abutment plate (4).

9. The multi-stage thermal expansion anchor according to claim 8, characterized in that: The bottom of the groove (11) is provided with a plurality of dot-shaped particle protrusions (6).

10. The multi-stage thermal expansion anchor according to claim 1, characterized in that: A force-bearing disk (12) is provided outwardly at the rear end of the extrusion tube (9).

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