In-hole anchor rod fixing device for anchor-shotcrete support of roof arch layer system of underground powerhouse

Abstract

The utility model belongs to the technical field of underground engineering construction equipment, and particularly relates to an in-hole anchor rod fixing device of an anchor-shotcrete support of an underground powerhouse top arch layer system, which comprises a plugging mechanism detachably connected with one end of an anchor rod and a limit ring fixedly connected with the other end of the anchor rod. A plurality of supporting rods are axially arranged on the outer wall of the limiting ring at equal intervals, limiting ribs are hinged to the ends of the supporting rods, the ends, facing the anchor hole, of the limiting ribs are oppositely close, and the other ends of the limiting ribs extend back to back. The mortar reinforcing steel bar anchor rod is simple in structure, an existing mortar reinforcing steel bar anchor rod structure is improved, the coaxiality of the anchor rod and an anchor hole can be effectively improved, meanwhile, the combination effect of the anchor rod and a rock mass is improved, grouting operation steps are simplified, and the grouting effect is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of underground engineering construction equipment, and in particular relates to an in-hole anchor fixing device for anchor spraying support of an underground factory roof arch system. Background Technology

[0002] The anchor-sprayed support system for the arch layer of underground powerhouses often employs a "first insert, then grout" anchor installation process. This involves inserting the anchor rod, with a grout return pipe attached, into the anchor hole after the hole has passed inspection. Then, a grouting pipe is inserted at the hole opening, and the gap at the opening is sealed tightly with cotton yarn. Finally, grout is slowly injected into the anchor hole using a grouting machine. Grouting is stopped when no more air escapes from the grout return pipe and grout flows out. The grouting pipe is then removed, and the anchor rod is secured with wooden wedges. This entire process is cumbersome and time-consuming. Furthermore, the anchor rod is difficult to secure in the wall hole, and its position can easily shift due to grouting, resulting in poor anchoring. Additionally, sealing the anchor hole opening with cotton yarn can lead to incomplete sealing and grout leakage. Therefore, it is necessary to provide a new in-hole anchor rod fixing device for the anchor-sprayed support system of underground powerhouses to solve these technical problems. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an in-hole anchor fixing device for anchor-sprayed support in the arch layer system of an underground powerhouse. This utility model has a simple structure and improves upon the existing mortar-reinforced anchor structure, effectively enhancing the coaxiality of the anchor and the anchor hole, improving the bonding effect between the anchor and the rock mass, simplifying the grouting operation steps, and ensuring the grouting effect.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An in-hole anchor fixing device for anchor spraying support of an underground powerhouse roof arch system, the device includes a sealing mechanism detachably connected to one end of the anchor rod and a limiting ring fixedly connected to the other end of the anchor rod. The outer wall of the limiting ring is provided with several support rods axially spaced at equal intervals, and the ends of the support rods are hinged to limiting ribs. The several limiting ribs are arranged facing each other towards the anchor hole at one end and extending away from each other at the other end.

[0006] Preferably, the end of the limiting rib facing the anchor hole has a vertical protrusion.

[0007] Preferably, the device further includes a rubber band collar with a protruding end for wrapping around and binding several limiting ribs.

[0008] Preferably, the sealing mechanism includes two coaxially arranged rubber discs, which are interference-fitted with the anchor rod through a preset through hole.

[0009] Preferably, the two rubber discs are also provided with inlet and outlet holes for interference fit of the slurry inlet pipe and slurry return pipe, respectively.

[0010] Preferably, the two rubber discs are connected by a corrugated rubber tube to form a cavity structure.

[0011] The working process of this utility model is as follows:

[0012] First, the end of the anchor rod left outside the anchor hole is inserted into the through hole on the rubber disc. Then, the end of the anchor rod with the limiting mechanism is inserted into the anchor hole. Because the rubber band collar gathers the protruding end of the limiting rib, the limiting rib can be smoothly inserted into the anchor hole. Moreover, the other end of the limiting rib is squeezed by the hole wall, which will tighten the rubber band collar at the other end. This ensures that the end of the limiting rib facing outward always maintains effective contact with the inner wall of the anchor hole. This not only ensures the coaxiality of the anchor rod and the anchor hole, but also improves the bonding force with the mortar after grouting.

[0013] After the anchor bolt is inserted, the outer rubber disc is axially compressed, causing the cavity structure to compress and the corrugated rubber tube to expand outwards to tightly fit the inner wall of the anchor hole opening, preventing grout leakage during subsequent grouting. Then, the grouting pipe and return pipe are inserted into the anchor hole through the inlet and outlet holes, respectively, for grouting. After grouting is complete, the grouting pipe and return pipe are removed, and wooden wedges are inserted into the inlet and outlet holes for final sealing. Once the mortar has solidified, the cavity structure can be separated from the anchor bolt and is ready for the next use.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention has a simple structure and improves the existing mortar-reinforced anchor structure, which can effectively improve the coaxiality of the anchor and the anchor hole, improve the bonding effect between the anchor and the rock mass, and simplify the grouting operation steps while ensuring the grouting effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the in-hole anchor bolt fixing device for the anchor-sprayed support of the underground powerhouse roof arch system described in the specific implementation method;

[0016] Figure 2 This is a schematic diagram of the sealing mechanism described in a specific embodiment. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] like Figure 1-2As shown, an in-hole anchor bolt fixing device for anchor spraying support of an underground powerhouse roof arch layer system includes a sealing mechanism 2 detachably connected to one end of the anchor bolt 1 and a limiting ring 3 fixedly connected to the other end of the anchor bolt 1. The outer wall of the limiting ring 3 is provided with several support rods 31 at equal intervals along the axis, and the ends of the support rods 31 are hinged to limiting ribs 32. The ends of the several limiting ribs 32 facing the anchor hole are provided with protrusions 33 vertically and are hooped together by rubber band loops 34 in a facing-to-facing manner, while the other ends are extended in the opposite direction.

[0019] The sealing mechanism 2 includes two coaxially arranged rubber discs 21. The rubber discs 21 are interference-fitted with the anchor rod 1 through a pre-set through hole 22. The two rubber discs 21 are connected on their sides by a corrugated rubber tube 23 to form a cavity structure. The two rubber discs 21 are also provided with inlet holes 24 and outlet holes 25 for interference-fitting the slurry inlet pipe and slurry return pipe, respectively.

[0020] The working process of this utility model is as follows:

[0021] First, the end of the anchor rod 1 left outside the anchor hole is inserted into the through hole 22 on the rubber circular plate 21. Then, the end of the anchor rod 1 with the limiting mechanism is inserted into the anchor hole. Since the rubber band collar 34 gathers the protruding end 33 of the limiting rib 32, the limiting rib 32 can be smoothly inserted into the anchor hole. After the other end is squeezed by the hole wall, the rubber band collar 34 at the other end will be tightened, so that the end of the limiting rib facing the outside always maintains effective contact with the inner wall of the anchor hole. This not only ensures the coaxiality of the anchor rod and the anchor hole, but also improves the bonding force with the mortar after grouting.

[0022] After anchor bolt 1 is inserted, the external rubber disc 21 is axially compressed, causing the cavity structure to compress and the corrugated rubber tube 22 to expand outward to tightly fit the inner wall of the anchor hole opening, preventing grout leakage during subsequent grouting. Then, the grouting pipe and return pipe are inserted into the anchor hole through the inlet hole 24 and outlet hole 25, respectively, for grouting. After grouting is completed, the grouting pipe and return pipe are pulled out, and wooden wedges are inserted into the inlet and outlet holes for final sealing. After the mortar solidifies, the cavity structure is separated from the anchor bolt and ready for future use.

Claims

1. A hole anchor fixing device for shotcrete support of an underground powerhouse roof arch system, characterized in that, The device includes a sealing mechanism detachably connected to one end of the anchor rod and a limiting ring fixedly connected to the other end of the anchor rod. The outer wall of the limiting ring is provided with several support rods at equal intervals along the axis, and the ends of the support rods are hinged to limiting ribs. The limiting ribs are arranged with their ends facing each other towards the anchor hole and their other ends extending away from each other.

2. The in-hole anchor fixing device for the anchor-sprayed support system of the underground powerhouse roof arch layer as described in claim 1, characterized in that, The end of the limiting rib facing the anchor hole has a vertical protrusion.

3. The in-hole anchor fixing device for the anchor-sprayed support system of the underground powerhouse roof arch layer as described in claim 2, characterized in that, The device also includes a rubber band collar with a protruding end for wrapping around and binding several limiting ribs.

4. The in-hole anchor fixing device for the anchor-sprayed support system of the underground powerhouse roof arch layer as described in claim 1, characterized in that, The sealing mechanism includes two coaxially arranged rubber discs, which are interference-fitted with the anchor rod through a pre-set through hole.

5. The in-hole anchor fixing device for the anchor-sprayed support system of the underground powerhouse roof arch layer as described in claim 4, characterized in that, The two rubber discs are also provided with corresponding inlet and outlet holes for interference fit of the slurry inlet pipe and slurry return pipe, respectively.

6. The in-hole anchor fixing device for the anchor-sprayed support system of the underground powerhouse roof arch layer as described in claim 5, characterized in that, The two rubber discs are connected by a corrugated rubber tube to form a cavity structure.

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