Roadway supporting device for unstable coal seam mining
By combining U-shaped steel supports, channel steel supports, and anchor bolts, the problem of short support life in unstable coal seam roadways has been solved, achieving flexibility, adaptability, and high stability, thus extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN HUAYINGSHAN LONGTAN COAL
- Filing Date
- 2025-07-03
- Publication Date
- 2026-05-15
AI Technical Summary
Existing coal seam mining roadway support devices have a limited service life in unstable coal seams, cannot accurately adapt to changes in dip angle, and require regular maintenance.
The system employs a combined structure comprising a first U-shaped steel bracket, a second channel steel bracket, cable clamps, and anchor bolts. The second channel steel bracket is embedded into the first U-shaped steel bracket, multiple cable clamps are connected, and multiple anchor bolts pass through the bracket to form a stable support. The fixing effect is enhanced by an expansion cylinder and an elastic convex ring.
It achieves stable support for unstable coal seam roadways, is flexible in use, highly adaptable, has a long service life, a wide range of applications, and high stability.
Smart Images
Figure CN224244906U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of support technology for hard roadways in coal seam mining, and more specifically, to a roadway support device for unstable coal seam mining. Background Technology
[0002] Under complex geological conditions, unstable dipping angles can lead to safety problems such as equipment slippage and overturning, roof collapse, and gas outbursts in coal seam mining, as well as problems such as low mining efficiency and resource waste. Therefore, for the mining of unstable coal seams, it is necessary to further install support devices in the mining roadways.
[0003] In existing technologies, retractable U-shaped steel supports are typically used for support. These supports are connected by iron clamps to form an integral structure, and elastic collars or cable clamps are installed at the joints to provide preload and frictional resistance. This allows the supports to axially contract under surrounding rock pressure (the contraction can reach 400-1000mm), releasing stress and maintaining load-bearing capacity. The supports disperse pressure through elastic deformation, avoiding fractures caused by localized stress concentration, thus significantly improving disaster resistance. For example, patent CN204175316U discloses a U-shaped steel support that, specifically, uses each of the... The U-shaped steel support features multiple reinforcing webs within its U-shaped channel, significantly increasing its rigidity and strength. This makes it less prone to torsion and deformation under long-term pressure from the surrounding rock, thereby improving its overall compressive bearing capacity and structural stability. However, reinforcing webs only strengthen the support. In unstable coal seams, the inclination angle is unstable, meaning that even with enhanced stability, there is still a risk of excessive local stress leading to deformation or even breakage, and potentially, the entire support could collapse under pressure. Furthermore, its service life is limited, requiring regular inspection and maintenance.
[0004] Based on the above description, there is an urgent need for a roadway support device suitable for the development of unstable coal seams. Utility Model Content
[0005] The purpose of this utility model is to provide a roadway support device for unstable coal seam development, which aims to solve the technical problem that existing roadway support devices for coal seam development, which use reinforced web plates for strength enhancement, cannot be accurately applied to unstable coal seams with varying dip angles, resulting in a limited service life of the support and the need for regular maintenance.
[0006] The embodiments of this utility model are achieved through the following technical solutions:
[0007] A roadway support device for unstable coal seam development includes a first U-shaped steel support, a second channel steel support, multiple cable clamps, and multiple anchor bolts; one end of the second channel steel support is embedded in the cavity of the first U-shaped steel support; the second channel steel support is connected to the first U-shaped steel support through multiple cable clamps; the multiple anchor bolts pass through the first U-shaped steel support and exit the second channel steel support in sequence.
[0008] Preferably, the cross-section of the second channel steel support is Ω-shaped; the protruding end of the second channel steel support is embedded in the cavity of the first U-shaped steel support; the other end of the second channel steel support opposite to the protruding end is attached to the first U-shaped steel support.
[0009] Preferably, the first U-shaped steel bracket is provided with a plurality of first through holes at intervals; the second channel steel bracket is provided with a plurality of second through holes at intervals corresponding to the first through holes; the anchor rod passes through the first through holes and the second through holes in sequence.
[0010] Preferably, the anchor bolt includes a rod body and an anchor head; the anchor head is located at one end of the rod body that passes through the second channel steel support.
[0011] Preferably, the anchor head includes a drill bit with a triangular cross-section and a pair of baffles; the pair of baffles are disposed opposite to each other at the end of the drill bit that connects to the anchor rod; the anchor rod is disposed between the pair of baffles.
[0012] Preferably, the system also includes multiple reinforcing cylinders and multiple expanding cylinders; the reinforcing cylinders are embedded in the groove cavity of the second channel steel support; the expanding cylinders are disposed inside the reinforcing cylinders; the expanding cylinders, the first through hole, and the second through hole are interconnected.
[0013] Preferably, the inner wall of the expansion cylinder is provided with a plurality of elastic protruding rings spaced apart along the axial direction.
[0014] Preferably, the cable includes a first connecting plate and a second U-shaped groove plate; the two ends of the first connecting plate are screwed to the two ends of the second U-shaped groove plate.
[0015] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:
[0016] This utility model forms a stable support structure by embedding a second channel steel bracket into a first U-shaped steel bracket. Furthermore, multiple cable clamps are used to securely connect the second channel steel bracket and the first U-shaped steel bracket. Additionally, multiple anchor bolts are sequentially inserted through the first U-shaped steel bracket and out of the second channel steel bracket, forming multi-directional, deep-penetrating anchor points in the coal seam. This allows for flexible adjustment of the insertion direction and number of anchor bolts according to the coal seam conditions in different areas of the roadway, making it suitable for unstable coal seams. It provides stable support for unstable coal seam roadways, is flexible in use, has a wide range of applications, high stability, and a long service life. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 for Figure 1 A sectional view;
[0019] Figure 3 for Figure 1 Sectional view of plane AA;
[0020] Figure 4 for Figure 3 A schematic diagram showing the status of the reinforced cylinder;
[0021] Figure 5 This is a schematic diagram of the anchor head structure in this utility model;
[0022] Figure 6 This is a partial cross-sectional view of the reinforced cylinder in this utility model;
[0023] Figure 7 This is a schematic diagram of the cable clamp structure in this utility model.
[0024] Icons: 1-First U-shaped steel bracket, 2-Second channel steel bracket, 3-Cable clamp, 31-First connecting plate, 32-Second U-shaped channel plate, 4-Anchor rod, 41-Rod body, 42-Anchor head, 421-Drill bit, 422-Baffle plate, 5-Reinforcing cylinder, 6-Expansion cylinder, 7-Elastic convex ring. Detailed Implementation
[0025] The specific implementation method is described below with reference to the accompanying drawings.
[0026] Example 1
[0027] Please see Figures 1 to 6 This utility model provides the following technical solution: a roadway support device for unstable coal seam mining, which is suitable for the support of coal seam mining roadways.
[0028] Specifically, such as Figure 1 and Figure 2As shown, a roadway support device for unstable coal seam development includes a first U-shaped steel support 1, a second channel steel support 2, multiple cable clamps 3, and multiple anchor bolts 4; one end of the second channel steel support 2 is embedded in the cavity of the first U-shaped steel support 1; the second channel steel support 2 is connected to the first U-shaped steel support 1 through multiple cable clamps 3; the multiple anchor bolts 4 pass through the first U-shaped steel support 1 and out of the second channel steel support 2 in sequence.
[0029] In this embodiment, a stable support structure is formed by embedding the second channel steel support 2 into the first U-shaped steel support 1. Furthermore, multiple cable clamps 3 are used to securely connect the second channel steel support 2 and the first U-shaped steel support 1. Additionally, multiple anchor bolts 4 are sequentially inserted through the first U-shaped steel support 1 and out of the second channel steel support 2, forming multi-directional, deep-penetrating anchor points in the coal seam. This allows for flexible adjustment of the insertion direction and number of anchor bolts 4 according to the coal seam conditions in different areas of the roadway, making it suitable for unstable coal seams. It provides stable support for unstable coal seam roadways, is flexible in use, has a wide range of applications, high stability, and a long service life.
[0030] In this embodiment, the first U-shaped steel bracket 1 and the second channel steel bracket 2 are preferably arched brackets with the top conventional in the art, so as to facilitate the insertion of multiple anchor rods 4 at multiple angles and directions.
[0031] Specifically, such as Figure 3 As shown, the cross-section of the second channel steel support 2 is Ω-shaped; the protruding end of the second channel steel support 2 is embedded in the groove cavity of the first U-shaped steel support 1; the other end of the second channel steel support 2 opposite to the protruding end is erected on the first U-shaped steel support 1.
[0032] In this embodiment, a second channel steel bracket 2 with an Ω-shaped cross section is used to facilitate its connection with the cavity of the first U-shaped steel bracket 1. This not only enhances the support effect but also limits each other's positioning and facilitates quick disassembly.
[0033] Specifically, such as Figure 4 As shown, the first U-shaped steel bracket 1 is provided with multiple first through holes at intervals; the second channel steel bracket 2 is provided with multiple second through holes at intervals corresponding to the first through holes; the anchor rod 4 passes through the first through holes and the second through holes in sequence.
[0034] In this embodiment, a first through hole and a second through hole corresponding to the first through hole are provided to facilitate the installation of anchor rods.
[0035] Specifically, such as Figure 4 and Figure 5As shown, the anchor bolt 4 includes a rod body 41 and an anchor head 42; the anchor head 42 is located at one end of the rod body 41 that passes through the second channel steel support 2. The anchor head 42 includes a drill bit 421 with a triangular cross-section and a pair of baffles 422; the pair of baffles 422 are positioned opposite each other at the end of the drill bit 421 that connects to the anchor bolt 4; the anchor bolt 4 is located between the pair of baffles 422.
[0036] In this embodiment, the drill bit 421 facilitates the efficiency of the anchor rod 4 in breaking through the soil. The wider end of the drill bit 421 is welded to the rod body 41. The wider end extends horizontally to both ends away from the rod body 41 and is provided with a pair of baffles 422 parallel to the rod body 41. Thus, the pair of baffles 422 can ensure that the anchor rod 4 does not easily fall off after being inserted into the soil.
[0037] Specifically, such as Figure 4 and Figure 6 As shown, it also includes multiple reinforcing cylinders 5 and multiple expansion cylinders 6; the reinforcing cylinders 5 are embedded in the groove of the second channel steel support 2; the expansion cylinders 6 are disposed inside the reinforcing cylinders 5; the expansion cylinders 6, the first through hole and the second through hole are interconnected. The inner sidewall of the expansion cylinder 6 is provided with multiple elastic protruding rings 7 at intervals along the axial direction.
[0038] In this embodiment, the elastic convex ring 7 and the expansion cylinder 6 are an integral structure, and both are made of elastic materials commonly used in the art, such as elastic silicone and rubber. By using the expansion cylinder 6, the anchor rod 4 can be limited after passing through, thereby improving the stability and service life of the support device.
[0039] Specifically, such as Figure 1 and Figure 7 As shown, the cable 3 includes a first connecting plate 31 and a second U-shaped groove plate 32; the two ends of the first connecting plate 31 are screwed to the two ends of the second U-shaped groove plate 32.
[0040] In this embodiment, the two ends of the first connecting plate 31 are screwed to the two ends of the second U-shaped groove plate 32 to facilitate disassembly, inspection and replacement.
Claims
1. A roadway support device for unstable coal seam development, characterized in that: It includes a first U-shaped steel support (1), a second channel steel support (2), multiple cable clamps (3) and multiple anchor rods (4); one end of the second channel steel support (2) is embedded in the cavity of the first U-shaped steel support (1); the second channel steel support (2) is connected to the first U-shaped steel support (1) through multiple cable clamps (3); the multiple anchor rods (4) pass through the first U-shaped steel support (1) and out of the second channel steel support (2) in sequence.
2. The roadway support device for unstable coal seam development according to claim 1, characterized in that: The cross-section of the second channel steel support (2) is Ω-shaped; the protruding end of the second channel steel support (2) is embedded in the groove cavity of the first U-shaped steel support (1); the other end of the second channel steel support (2) opposite to the protruding end is attached to the first U-shaped steel support (1).
3. The roadway support device for unstable coal seam development according to claim 1 or 2, characterized in that: The first U-shaped steel bracket (1) is provided with a plurality of first through holes at intervals; the second channel steel bracket (2) is provided with a plurality of second through holes at intervals corresponding to the first through holes; the anchor rod (4) passes through the first through holes and the second through holes in sequence.
4. The roadway support device for unstable coal seam development according to claim 3, characterized in that: The anchor rod (4) includes a rod body (41) and an anchor head (42); the anchor head (42) is located at one end of the rod body (41) that passes through the second channel steel support (2).
5. The roadway support device for unstable coal seam development according to claim 4, characterized in that: The anchor head (42) includes a drill bit (421) with a triangular cross-section and a pair of baffles (422); the pair of baffles (422) are disposed opposite to each other at the end where the drill bit (421) is connected to the anchor rod (4); the anchor rod (4) is disposed between the pair of baffles (422).
6. The roadway support device for unstable coal seam development according to claim 4, characterized in that: It also includes multiple reinforcing cylinders (5) and multiple expansion cylinders (6); the reinforcing cylinders (5) are embedded in the groove of the second channel steel support (2); the expansion cylinders (6) are disposed inside the reinforcing cylinders (5); the expansion cylinders (6), the first through hole and the second through hole are interconnected.
7. The roadway support device for unstable coal seam development according to claim 6, characterized in that: The inner wall of the expansion cylinder (6) is provided with a plurality of elastic protrusions (7) spaced apart along the axial direction.
8. The roadway support device for unstable coal seam development according to claim 3, characterized in that: The cable (3) includes a first connecting plate (31) and a second U-shaped groove plate (32); the two ends of the first connecting plate (31) are screwed to the two ends of the second U-shaped groove plate (32).