Quickly-dockable combined full-thread glass fiber reinforced plastic hollow grouting anchor rod

Abstract

The utility model relates to the technical field of coal mine support, and specifically discloses a combined full-thread glass fiber reinforced plastic hollow grouting anchor rod capable of being quickly docked, which comprises the following components: multi-section hollow grouting anchor rods, anchor rod assemblies, connecting assemblies and hole sealing assemblies; the multi-section hollow grouting anchor rods are all full-thread glass fiber reinforced plastic structures and are connected to each other through the connecting assemblies; the anchor rod assemblies comprise trays and nuts, the trays are matched with the outer sides of the hollow grouting anchor rods at the outermost ends, and the nuts are matched with the outer sides of the trays; the utility model solves the problems of low construction efficiency, easy pipe blockage, grout leakage, non-reusable joints and the inability of a coal cutter to cut and retain the rod body during the construction of mine iron pipe grouting, simplifies the related matched devices into a set of construction process, and achieves the effects of efficient construction and active reinforcement of coal and rock bodies.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine support technology, specifically relating to a quick-connectable combined fully threaded fiberglass hollow grouting anchor. Background Technology

[0002] Coal wall spalling and roof collapse are among the most complex and challenging problems in the field of mining engineering. Currently, the most common methods for controlling coal wall spalling and roof collapse include coal grouting to reinforce the coal seam. Long iron pipes are typically used as grouting pipelines to allow the grout to diffuse from deep within the coal seam.

[0003] However, after grouting, the rod needs to remain in the coal body. The iron pipe itself has low tensile strength, shear strength, and elastic modulus, so it cannot be completely cut off when the coal cutting machine cuts it. This causes the deep coal body to be further disturbed by the displacement of the rod. At the same time, it only serves as a grout flow pipeline and cannot play an active support role for the coal body.

[0004] Furthermore, deep hole grouting requires splicing multiple sections of iron pipe (such as 6 sections × 1m pipe) into a single pipeline. Existing technology uses nuts for connection, but each section requires manual tightening of the nut, which is inconvenient and time-consuming. In addition, traditional grouting iron pipes are expensive, have low construction efficiency, and the sealing measures rely on manual experience, resulting in poor controllability and easy problems such as pipe blockage and grout leakage. The grouting pipe joints can only be used once, increasing construction costs. Utility Model Content

[0005] The purpose of this utility model is to provide a modular, fully threaded fiberglass hollow grouting anchor rod that can be quickly connected to solve the problems of low construction efficiency and quality of grouting iron pipes used in mining, and to achieve the effects of rapid construction, rod cutting, drilling and sealing, grouting, anti-clogging, and active support.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A quick-connecting, modular, fully threaded fiberglass hollow grouting anchor bolt, comprising:

[0008] Multi-segment hollow grouting anchor bolts, anchor bolt assemblies, connecting assemblies, and sealing assemblies;

[0009] All the hollow grouting anchor rods described above are fully threaded fiberglass structures, and they are connected to each other through connecting components;

[0010] The anchor bolt assembly includes a tray and a nut. The outermost hollow grouting anchor bolt is fitted with a tray, and the outer side of the tray is fitted with a nut.

[0011] The connecting assembly includes a quick connector and a connector head. The quick connector includes a connecting sleeve, a base, a fixing ring, a moving sleeve, a steel ball, a reset clamping spring, a rubber sealing ring, a sealing plug, a pagoda spring, and a connecting joint. The connecting sleeve and the connecting joint are respectively fitted onto the interface of two adjacent rod sections through internal threaded holes.

[0012] The connector includes a connecting sleeve and an adapter. The connecting sleeve is threaded onto the tail end of the outermost hollow grouting anchor rod, and the outer side of the adapter is connected to the grouting pipe.

[0013] The sealing assembly includes an anchor head and a grout stopper. The anchor head is placed at the innermost end of the hollow grouting anchor rod, and the grout stopper is placed inside the rod body tray.

[0014] Preferably, the hollow grouting anchor is a fully threaded fiberglass anchor, composed of glass fiber and epoxy resin.

[0015] Preferably, the quick connector is a single-channel open / close quick connector, with matching sealant on its inner side and a matching sealing rubber gasket on the inner side of the connector head.

[0016] Preferably, the rubber sealing ring is made of oil-resistant rubber. When the connecting joint is inserted into the seat, the valve opens, causing fluid to flow, and the gasket can completely block fluid leakage.

[0017] Preferably, the anchor head is equipped with internal threads, its sidewall has multiple slurry outlet holes, and a spiral stirring ring is provided inside. The slurry stop plug is provided with matching sealant on its inner side.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] By synergistically combining anchor bolt assemblies, connecting assemblies, and sealing assemblies, grouting reinforcement of the coal seam is achieved, effectively improving grouting construction efficiency and quality. On one hand, the fiberglass fully threaded hollow anchor bolts, combined with the pre-tightening force applied by the tray and nut, form continuous active support, enhancing the stability of the coal seam. On the other hand, quick-connect couplings and joints enable rapid connection between the hollow grouting anchor bolts and the grouting pipes without grout leakage, ensuring the high efficiency of the grouting process. Furthermore, the anchor head and grout stopper reduce the pipe blockage caused by coal seam injection into the hollow grouting anchor bolts and prevent grout leakage during drilling, further improving the success rate of grouting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the anchor bolt assembly of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the connecting component of this utility model;

[0022] Figure 3 This is a schematic diagram of the connector structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the sealing assembly of this utility model;

[0024] In the diagram: 1. Hollow grouting anchor rod; 2. Tray; 3. Nut; 4. Connecting sleeve; 5. Seat body; 6. Fixing ring; 7. Moving sleeve; 8. Steel ball; 9. Reset clamping spring; 10. Rubber sealing ring; 11. Sealing plug; 12. Pagoda spring; 13. Connecting joint; 14. Adapter; 15. Anchor head; 16. Grout stop plug; 17. Quick connector; 18. Connecting head. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Example

[0027] Please see Figures 1-4 As shown, a quick-connecting, modular, fully threaded fiberglass hollow grouting anchor bolt includes:

[0028] Multi-segment hollow grouting anchor bolt 1, anchor bolt assembly, connecting assembly and sealing assembly;

[0029] All multi-segment hollow grouting anchor rods 1 are fully threaded fiberglass structures, specifically right-hand fully threaded hollow fiberglass anchor rods, composed of glass fiber and epoxy resin. The hollow grouting anchor rods 1 have an outer diameter of 32mm, an inner diameter of 18mm, and a length of 3000mm. They are connected to each other via connecting components. The low elastic modulus and high tensile strength of the fiberglass material allow the coal cutter to completely cut the rod body, eliminating disturbance to deep coal seams. Simultaneously, the right-hand fully threaded structure and matching pallet nuts can repeatedly provide active support force (compared to traditional iron pipe grouting reinforcement of coal and rock masses, active support pre-tightens the coal body, reducing the secondary disturbance to the coal body caused by the coal cutter, and further controlling coal wall spalling).

[0030] The anchor bolt assembly includes a tray 2 and a nut 3. The outermost hollow grouting anchor bolt 1 is fitted with a tray 2, specifically with a diameter of 170mm and a length of 100mm. The outer side of the tray 2 is fitted with a nut 3, specifically with an outer diameter of 50mm and an inner diameter of 32mm.

[0031] The connection assembly includes a quick-connect connector 17 and a connector 18. The quick-connect connector 17 includes a connecting sleeve 4, a seat 5, a retaining ring 6, a moving sleeve 7, a steel ball 8, a reset clamping spring 9, a rubber sealing ring 10, a sealing plug 11, a pagoda spring 12, and a connecting joint 13. The connecting sleeve 4 and the connecting joint 13 are respectively fitted onto the interfaces of two adjacent rod sections through internal threaded holes. The rubber sealing ring 10 is made of oil-resistant rubber. When the connecting joint 13 is inserted into the seat 5, the valve opens, causing fluid to flow. The gasket can completely block fluid leakage.

[0032] During installation, the connecting sleeve 4 is screwed through the internal threaded hole to the interface end of one section of the hollow grouting anchor rod 1. At the same time, the connecting joint 13 is screwed through the internal threaded hole to the interface end of the other section of the hollow grouting anchor rod 1 to be connected, completing the initial assembly of the two rod sections and the connector components. The moving sleeve 7 is pushed to compress and reset the clamping spring 9. At this time, the steel ball 8 constrained by the fixing ring 6 is released from its locked state. The end of the rod with the connecting joint 13 is aligned with the seat 5 with the connecting sleeve 4 and inserted axially. After insertion, the moving sleeve 7 is released, and the clamping spring 9 returns to its original position. The spring pushes the movable sleeve 7 to reset, and the steel ball 8 is squeezed into the corresponding slot of the connecting joint 13 under the pressure of the movable sleeve 7, realizing the mechanical locking of the two rod sections and preventing them from falling off. During the process of the connecting joint 13 being inserted into the seat 5, its end pushes open the sealing plug 11 and compresses the pagoda spring 12, so that the hollow channel is open and the grouting fluid can pass through. At the same time, the oil-resistant rubber sealing ring 10 tightly fits the contact surface between the connecting joint 13 and the seat 5, completely blocking fluid leakage and ensuring the sealing effect; thus, the hollow grouting anchor rod 1 can be quickly connected, improving construction efficiency and quality.

[0033] The connector 18 includes a connecting sleeve 4 and an adapter 14. The connecting sleeve 4 is threaded onto the tail end of the outermost hollow grouting anchor rod 1. The adapter 14 is connected to the grouting pipe on the outside. The adapter 14 can be connected to a tee connector to meet the needs of different grouting schemes. As can be seen from the figure, the hexagonal prism design on the outer periphery of the connector 18 allows the operator to disassemble the work using a pipe wrench, quickly and effortlessly completing the threaded connection and disconnection of the connector 18 and the outermost hollow grouting anchor rod 1.

[0034] The quick connector 17 is a single-channel open / close quick connector, specifically with an outer diameter of 40mm and a length of 100mm, and is equipped with matching sealant on its inner side; the connector 18 is equipped with a matching sealing rubber gasket on its inner side.

[0035] The sealing assembly includes an anchor head 15 and a grout stop plug 16. The anchor head 15 is located at the innermost end of the hollow grouting anchor rod 1. The anchor head 15 has an outer diameter of 36mm, internal threads, multiple grout outlet holes on its sidewalls, and a spiral stirring ring inside. The grout stop plug 16 is located inside the rod tray 2, with matching sealant on its inner side. It has a small end diameter of 40mm and a large end diameter of 62mm. The anchor head 15 is tightly fitted onto the innermost end of the hollow grouting anchor rod 1 through its internal threads, which is equivalent to putting a "protective sleeve" on the grout outlet end of the hollow grouting anchor rod 1. Its fitting structure ensures that the original grout outlet end of the hollow grouting anchor rod 1 is protected by the anchor head. The anchor head 15 is completely enclosed, forming a physical isolation between the anchor head 15 and the coal body and debris inside the coal wall hole, preventing coal blocks from directly entering the hollow grouting anchor 1 and blocking the channel. At the same time, the spiral stirring ring inside the anchor head 15 can disturb the two fluids (one water and one cement slurry) during grouting. When the two materials flow through the stirring ring, the fluids are stirred a second time, making the water and cement slurry mix more evenly. Finally, the fully mixed slurry seeps into the coal wall through multiple slurry outlet holes opened on the side wall of the anchor head 15, replacing the slurry outlet of the hollow grouting anchor 1 itself as the final channel for slurry flow, which not only ensures smooth slurry flow but also improves the mixing quality of the slurry.

[0036] The steps for grouting coal seams using fully threaded fiberglass hollow grouting anchors and their supporting construction equipment are as follows:

[0037] (1) Drill holes in the coal body using a drilling rig. The drilling rig uses a twist drill rod and the drilling diameter is 42mm. The anchor head 15 is screwed onto the innermost hollow grouting anchor rod 1 through the internal thread. The anchor head 15 is equipped with internal threads and has multiple grout outlet holes on its side wall. It is equipped with a spiral stirring ring inside. This structure allows the grout to flow out from the inside of the anchor head 15 to the grout outlet hole, forming a wrap-around protection and reducing blockage.

[0038] The hollow grouting anchor rod 1 is then inserted into the drilled hole. The hollow grouting anchor rod 1 is a fully threaded fiberglass structure composed of glass fiber and epoxy resin. Specifically, it has an outer diameter of 32mm and an inner diameter of 18mm, which can be used for drilled holes from 42mm to 72mm. The grout stop plug 16 has a small end diameter of 40mm and a large end diameter of 62mm. The length of the hollow grouting anchor rod 1 can be matched according to the needs of on-site construction.

[0039] (2) If the drilling depth exceeds the length of a single rod section, the multi-section hollow grouting anchor rod 1 is connected through the quick connector 17: the connecting sleeve 4 and the connecting joint 13 are respectively tightened on the interface of the two adjacent rod sections through the internal thread hole. The locking of the steel ball 8 can be released by pushing the moving sleeve 7 to compress and reset the clamping spring 9. After axial insertion, the moving sleeve 7 is released and the spring rebounds so that the steel ball 8 is inserted into the slot of the connecting joint 13 to complete the mechanical locking. The whole process does not require manual tightening of the nut. The docking time is greatly shortened compared with the traditional iron pipe connection. Moreover, the sealant on the inside of the quick connector 17 and the oil-resistant rubber sealing ring 10 can form a double seal to completely block grout leakage.

[0040] After all the assembled hollow grouting anchor rods 1 are inserted into the borehole, a grout stop plug 16 (small end diameter 40mm, large end diameter 62mm) is connected to the exposed part of the pre-reserved hollow grouting anchor rod 1 via an external thread. The sealant inside the plug will fit tightly against the borehole wall as the rod is inserted. When the tray 2 (diameter 170mm) and nut 3 (inner diameter 32mm matching the full thread of the rod) are tightened, the grout stop plug 16 will expand under the force, further filling the gap between the borehole and the rod. Combined with the structural characteristics of the right-hand threaded rod, it can provide continuous axial preload through the tray 2 and nut 3, repeatedly providing active support to the coal body (the support strength is 40% higher than that of traditional passive grouting with iron pipes), and can also prevent grout from leaking out of the borehole through expansion sealing.

[0041] (3) A connector 18 is installed at the outermost end of the exposed hollow grouting anchor rod 1. Its hexagonal prism design on the outer periphery can be adapted to a pipe wrench, allowing operators to quickly and effortlessly connect and disconnect the connector from the hollow grouting anchor rod 1, avoiding the problems of time-consuming operation and material waste caused by slippage on the circular outer periphery. The sealing rubber gasket on the inner side of the connector 18 cooperates with the adapter 14 to ensure no grout leakage after connection with the grouting pipe. At the same time, the adapter 14 can flexibly connect to a tee connector to meet the needs of different construction schemes such as single-hole grouting and multi-hole synchronous grouting, improving the adaptability of the device to complex working conditions. After connecting the fully threaded fiberglass hollow grouting anchor rod 1 to the grouting pipe through the connector 18, grouting can be started. The high tensile strength of the fiberglass rod and the hollow structure (18mm inner diameter) can ensure smooth flow of grout, laying the foundation for efficient grouting.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular, fully threaded fiberglass hollow grouting anchor bolt capable of quick connection, characterized in that, include: Multi-segment hollow grouting anchor (1), anchor assembly, connecting assembly and sealing assembly; All of the hollow grouting anchor rods (1) described above are fully threaded fiberglass structures and are connected to each other through connecting components; The anchor bolt assembly includes a tray (2) and a nut (3). The outer side of the hollow grouting anchor bolt (1) at the outermost end is fitted with a tray (2), and the outer side of the tray (2) is fitted with a nut (3). The connecting assembly includes a quick connector (17) and a connector (18). The quick connector (17) includes a connecting sleeve (4), a seat (5), a fixing ring (6), a moving sleeve (7), a steel ball (8), a reset clamping spring (9), a rubber sealing ring (10), a sealing plug (11), a pagoda spring (12), and a connecting joint (13). The connecting sleeve (4) and the connecting joint (13) are respectively fitted onto the interfaces of two adjacent rod sections through internal threaded holes. The connector (18) includes a connecting sleeve (4) and an adapter (14). The connecting sleeve (4) is threaded onto the tail end of the outermost hollow grouting anchor rod (1). The adapter (14) is connected to the grouting pipe on the outside. The sealing assembly includes an anchor head (15) and a grout stopper (16). The anchor head (15) is placed at the head end of the innermost hollow grouting anchor rod (1), and the grout stopper (16) is placed inside the rod body tray (2).

2. The quick-connectable combined fully threaded fiberglass hollow grouting anchor bolt according to claim 1, characterized in that: The hollow grouting anchor (1) is a fully threaded fiberglass anchor, composed of glass fiber and epoxy resin.

3. The quick-connectable combined fully threaded fiberglass hollow grouting anchor bolt according to claim 1, characterized in that: The quick connector (17) is a single-channel open-close quick connector with matching sealant on its inner side, and the connector (18) has a matching sealing rubber pad on its inner side.

4. The quick-connectable combined fully threaded fiberglass hollow grouting anchor bolt according to claim 1, characterized in that: The rubber sealing ring (10) is made of oil-resistant rubber.

5. A quick-connectable, modular, fully threaded fiberglass hollow grouting anchor bolt according to claim 1, characterized in that: The anchor head (15) is equipped with internal threads, and its side wall has multiple slurry outlet holes. It has a spiral stirring ring inside, and the slurry stop plug (16) has matching sealant on its inner side.

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