A support structure and support method for a small coal pillar roadway.

Abstract

This invention discloses a support structure and method for a small coal pillar roadway, belonging to the field of roadway support technology. The support structure includes a support base and a hydraulic push rod, with anti-retraction damping components symmetrically arranged on both sides of the hydraulic push rod. The anti-retraction damping components suppress the retraction of the hydraulic push rod when it is compressed. The anti-retraction damping components include a second support plate, a friction element, and two upper and lower fixing rods. A lubrication component is installed on the second support plate to lubricate the anti-retraction damping components. This invention can effectively reduce the friction between the components of the anti-retraction damping components and ensure the stability of the support structure in complex environments, providing a reliable guarantee for roadway safety.

Description

Technical Field

[0001] This invention belongs to the field of roadway support technology, specifically a support structure and support method for roadways with small coal pillars along the goaf. Background Art

[0002] In the field of coal mining, the small coal pillar roadway support technology is a key link to ensure safe production and improve mining efficiency. As the depth and intensity of coal mining continue to increase, the geological conditions of the roadway become more and more complex, facing many challenges such as high ground stress and fractured surrounding rock.

[0003] Traditional support structures for small coal pillar roadways, such as rigid supports and simple rock bolt supports, have obvious limitations. Rigid supports lack buffering and shock absorption capabilities, making it difficult to adapt to dynamic changes in roadway top pressure. They are prone to deformation or even damage when subjected to large impacts, failing to effectively ensure roadway safety. Simple rock bolt supports do not adhere well to the roadway top surface, making it difficult to achieve uniform support. Under irregular surrounding rock conditions, the support effect is greatly reduced. Summary of the Invention

[0004] This invention overcomes the shortcomings of existing technologies and proposes a support structure and method for small coal pillar roadways along the goaf; it solves the problems of poor buffering and easy damage of traditional rigid supports for small coal pillar roadways along the goaf; and insufficient fit and unsatisfactory support effect of anchor bolts. This invention is achieved through the following technical solution:

[0005] A support structure for a small coal pillar roadway includes a support base and a hydraulic push rod. The hydraulic push rod is fixedly mounted on the support base, and a support assembly is fixedly installed at the extended end of the hydraulic push rod. The support assembly is used to support the top of the roadway. Anti-retraction damping assemblies are symmetrically arranged on both sides of the hydraulic push rod to suppress the recoil of the hydraulic push rod under pressure. The anti-retraction damping assembly includes a second support plate, friction elements, and upper and lower fixed rods. The top end of the upper fixed rod is fixedly connected to the support assembly, and the bottom end of the lower fixed rod is fixedly connected to the support base. Sliding elements are connected to the adjacent ends of the upper and lower fixed rods. Second support plates are symmetrically installed on both sides of the lower fixed rod, and the bottom of the second support plates is fixedly mounted on the support base. Friction elements are symmetrically arranged between the two second support plates. The opposing sides of the two friction elements are in contact with the upper and lower sliding elements. A lubrication assembly is installed on the second support plate to lubricate the anti-retraction damping assembly.

[0006] Furthermore, each of the upper and lower fixed rods has a slot for insertion, and a sliding component is inserted into each slot. The outer wall of the fixed rod is fixed to the sliding component by the first bolt.

[0007] Furthermore, a rod is inserted into the inner wall of the second support plate; a second sliding groove is provided on the side wall of the two friction components, and the friction components slide in cooperation with the outer side wall of the adjacent rod through the second sliding groove, so that the friction components can slide axially on the rod.

[0008] Furthermore, the outer wall of the insertion rod is fitted with several butterfly springs. One end of the butterfly spring is in contact with the friction element, and the other end is in contact with the second support plate. The end of the insertion rod away from the butterfly spring is fixed to the second support plate by the second bolt.

[0009] Furthermore, the contact area between the friction component and the sliding component is designed with trapezoidal teeth.

[0010] Furthermore, the lubrication assembly includes a tank for storing lubricating oil. A sliding plate is slidably disposed on the inner wall of the tank. Several through holes are opened on the sliding plate. An oil outlet pipe is connected to the inner wall of the tank. The outlet of the oil outlet pipe is located at the contact point between the friction element and the sliding element. A connecting rod is fixedly disposed on the sliding plate. The connecting rod moves through the tank and is fixed to the outer wall of the sliding element by a third bolt.

[0011] Furthermore, the lubrication assembly also includes a third support plate, which is fixedly disposed on one side of the second support plate. The third support plate has a bearing groove, and the tank is placed in the bearing groove. A flow control valve is provided at the outlet of the oil outlet pipe.

[0012] Furthermore, the support assembly includes a first support plate, which is fixedly mounted on the extended end of the hydraulic push rod. Several sleeves are evenly distributed and fixedly mounted on the surface of the first support plate. A first sliding rod is slidably mounted on the inner wall of the sleeve, and a spring is fixedly mounted on the inner wall of the sleeve. The end of the first sliding rod close to the spring is in close contact with the spring, and the end of the first sliding rod in the same row away from the spring is fixedly mounted with the same flexible plate.

[0013] Furthermore, two adjacent flexible plates are rotatably connected to each other on their sides. One flexible plate has a rotating plate rotatably mounted on its pin, and a first sliding groove is provided on the rotating plate. The other flexible plate has rotating bars rotatably mounted on both ends of its pin. A second sliding rod is fixedly mounted between the two rotating bars, and the outer wall of the second sliding rod slides in cooperation with the inner wall of the first sliding groove.

[0014] A method for supporting a small coal pillar roadway along the goaf, employing the aforementioned small coal pillar roadway support structure, and comprising the following steps:

[0015] S1: First, the top of the tunnel is initially supported using support components;

[0016] S2: Subsequently, the support assembly is further supported by the anti-retraction damping component, and the amount of retraction when the hydraulic push rod is compressed is suppressed;

[0017] S3: The lubrication component uses the retraction of the hydraulic push rod to discharge lubricating oil, which lubricates the anti-retraction damping component and reduces wear during damping.

[0018] The beneficial effects of this invention compared to the prior art are as follows:

[0019] 1. The support assembly in this invention, through the cooperation of sleeve, first sliding rod, spring and flexible plate, can effectively absorb and buffer the pressure at the top of the roadway, avoid damage to the support structure due to instantaneous impact, and ensure the stability and safety of the support system. The flexible plate is made of elastic rubber material and, combined with the linkage structure of rotating plate, rotating strip and second sliding rod, can closely fit the irregular surface of the roadway top and automatically adjust according to the direction and magnitude of pressure to achieve uniform support and enhance the support effect. The wavy anti-slip texture on the surface of the flexible plate significantly increases the friction with the top of the roadway, prevents the support assembly from slipping, ensures the stability of the support structure in complex environments, and provides reliable protection for roadway safety.

[0020] 2. The anti-retraction damping component in this invention utilizes the trapezoidal tooth structure at the contact point between the sliding component and the friction component to generate significant friction, limiting the retraction of the hydraulic push rod under pressure. This prevents insufficient support at the top of the roadway due to excessive retraction of the hydraulic push rod, maintaining a stable support effect. The disc spring generates elasticity when deformed under pressure, pushing the friction component and the sliding component into close contact. It can dynamically adjust the friction force according to the pressure on the hydraulic push rod. When the pressure increases, the elasticity of the disc spring increases, and the friction force increases, further suppressing retraction. When the pressure decreases, the friction force is also adjusted accordingly, keeping the support structure in a stable state and adapting to dynamic changes in roadway pressure. The sliding component is fixed to the fixing rod by the first bolt, enabling detachable installation. After long-term use of the equipment, if the anti-retraction damping component shows wear or malfunction, the sliding component can be easily disassembled for inspection, repair, or replacement, reducing maintenance difficulty, improving equipment maintenance efficiency, and reducing downtime caused by equipment failure.

[0021] 3. The lubrication component in this invention, through the linkage design of the sliding member and the sliding plate, when the anti-shrink damping component is working, the sliding of the sliding member will drive the sliding plate to move synchronously, automatically squeezing out the lubricating oil and delivering it to the contact point between the friction member and the sliding member, without the need for frequent manual intervention, to achieve continuous and efficient automatic lubrication and effectively reduce friction between components. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the small coal pillar roadway support structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall small coal pillar roadway support structure of the present invention from another perspective;

[0024] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 For the present invention Figure 2 Enlarged view at point B in the middle;

[0026] Figure 5 This is a schematic diagram of the structure of the first support plate, the first sliding rod, and the sleeve of the present invention;

[0027] Figure 6 This is an exploded structural diagram of the anti-shrinkage damping component of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged view at point C;

[0029] Figure 8 For the present invention Figure 6 Enlarged view at point D;

[0030] Figure 9 This is a structural schematic diagram of the fixing rod, the first bolt, and the second support plate of the present invention;

[0031] Figure 10 For the present invention Figure 9 Enlarged view of point E in the middle.

[0032] In the diagram: 1. Support base; 2. Hydraulic push rod; 3. Support assembly; 301. First support plate; 302. Sleeve; 303. First slide rod; 304. Spring; 305. Flexible plate; 306. Shaft pin; 307. Rotating plate; 308. First slide groove; 309. Rotating bar; 310. Second slide rod; 4. Anti-shrinkage damping assembly; 401. Fixed rod; 402. Insertion groove; 403. Sliding element; 404. First bolt; 405. Second support plate; 406. Insert rod; 407. Friction element; 408. Second slide groove; 409. Butterfly spring; 410. Second bolt; 5. Lubrication assembly; 501. Third support plate; 502. Tank body; 503. Sliding plate; 504. Through hole; 505. Oil outlet pipe; 601. Connecting rod; 602. Third bolt; 7. Anti-slip texture. Detailed Implementation

[0033] To make the technical problem to be solved, the technical solution, and the beneficial effects of the present invention clearer, the present invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0034] See Figures 1 to 10This embodiment proposes a support structure for a small coal pillar roadway, including a support base 1 and a hydraulic push rod 2. Both the support base 1 and the hydraulic push rod 2 are made of high-strength alloy steel, which has good compressive and deformation resistance and can withstand the huge pressure from the top of the roadway. The hydraulic push rod 2 is fixedly mounted on the support base 1, and a support component 3 is fixedly installed on the extended end of the hydraulic push rod 2. The support component 3 is used to support the top of the roadway. The hydraulic push rod 2 is the power output component of the entire support structure. It is driven by a hydraulic system and can flexibly adjust the extension length according to the change of pressure at the top of the roadway to provide stable support force for the support component 3.

[0035] Specifically, the support assembly 3 includes a first support plate 301, which is fixedly mounted on the extended end of the hydraulic push rod 2. Several sleeves 302 are evenly distributed and fixedly mounted on the surface of the first support plate 301. A first sliding rod 303 is slidably mounted on the inner wall of the sleeve 302, and a spring 304 is fixedly mounted on the inner wall of the sleeve 302. The end of the first sliding rod 303 near the spring 304 is in close contact with the spring 304. The same flexible plate 305 is fixedly mounted on the end of the first sliding rod 303 in the same row away from the spring 304. When pressure is applied to the flexible plate 305 at the top of the roadway, the flexible plate 305 drives the first sliding rod 303 to slide into the sleeve 302, compressing the spring 304. During the compression process, the spring 304 can absorb and buffer the impact force from the top of the roadway, preventing the support structure from being damaged by excessive instantaneous pressure. The flexible plate 305 is made of elastic rubber material, which has good flexibility and elasticity and can closely fit the irregular surface of the roadway top to achieve uniform support.

[0036] Two adjacent flexible plates 305 are rotatably connected to each other on their adjacent sides by a pin 306. One flexible plate 305 has a rotating plate 307 rotatably mounted on its pin 306, and a first sliding groove 308 is formed on the rotating plate 307. The other flexible plate 305 has rotating bars 309 rotatably mounted at both ends of its pin 306. A second sliding rod 310 is fixedly mounted between the two rotating bars 309. The outer wall of the second sliding rod 310 slides in contact with the inner wall of the first sliding groove 308. When the flexible plate 305 is subjected to pressure of different directions and magnitudes... At the same time, by rotating the rotating plate 307 and rotating bar 309 and sliding the second sliding rod 310 in the first sliding groove 308, relative movement can be generated between the flexible plates 305, further adapting to the complex shape of the roadway top and enhancing the support effect. In addition, the side of the flexible plate 305 facing the roadway top is provided with anti-slip texture 7. The anti-slip texture 7 is a wave-shaped raised structure, which can significantly increase the friction between the flexible plate 305 and the roadway top, effectively preventing the support component 3 from slipping during the support process and ensuring the stability of the support structure.

[0037] Furthermore, two anti-retraction damping components 4 are installed on the support base 1, and the two anti-retraction damping components 4 are symmetrically arranged on both sides of the hydraulic push rod 2. The anti-retraction damping components 4 are used to suppress the amount of retraction of the hydraulic push rod 2 when it is compressed, so as to ensure the stability of the support structure under pressure.

[0038] Specifically, the anti-shrinkage damping assembly 4 includes two fixed rods 401, one above the other. The top end of the upper fixed rod 401 is fixedly connected to the first support plate 301, and the bottom end of the lower fixed rod 401 is fixedly connected to the support base 1. Each of the two fixed rods 401 has a slot 402 at one end close to the other, and a sliding member 403 is inserted into each slot 402. The outer wall of the fixed rod 401 is fixed to the sliding member 403 by a first bolt 404, allowing for detachable installation of the sliding member 403 on the fixed rod 401. Second support plates 405 are symmetrically installed on both sides of the lower fixed rod 401, and the bottom of the second support plate 405 is fixedly mounted on the support base 1. Insert rods 406 are inserted into the inner wall of the second support plate 405. Two friction elements 407 are symmetrically arranged between the two second support plates 405. Second sliding grooves 408 are opened on the side walls of the two friction elements 407. The friction elements 407 slide with the outer side wall of the adjacent insert rod 406 through the second sliding grooves 408, so that the friction elements 407 can slide axially on the insert rod 406.

[0039] The opposing sides of the two friction elements 407 are in contact with the upper and lower sliding elements 403, and the contact points between the friction elements 407 and the sliding elements 403 are arranged in a trapezoidal tooth shape. This toothed structure can increase the friction between the two and effectively suppress the retraction of the hydraulic push rod 2. Several butterfly springs 409 are sleeved on the outer wall of the insertion rod 406. One end of the butterfly spring 409 is in contact with the friction element 407, and the other end is in contact with the second support plate 405. The end of the insertion rod 406 away from the butterfly spring 409 is fixed to the second support plate 405 by the second bolt 410. When the butterfly spring 409 is subjected to pressure, it will deform and generate elastic force, pushing the friction element 407 and the sliding element 403 to fit tightly together, further enhancing the anti-retraction damping effect.

[0040] Furthermore, a lubrication component 5 is installed on the second support plate 405. The lubrication component 5 is used to lubricate the anti-shrinkage damping component 4, reduce the wear of the anti-shrinkage damping component 4 during operation, and extend the service life of the equipment.

[0041] Specifically, the lubrication assembly 5 includes a third support plate 501, which is fixedly disposed on one side of the second support plate 405. The third support plate 501 has a bearing groove, the inner wall of which is used to place the tank 502. The tank 502 is used to store lubricating oil. A sliding plate 503 is slidably disposed on the inner wall of the tank 502. The sliding plate 503 has several through holes 504, through which the lubricating oil can flow in the tank 502. An oil outlet pipe 505 is connected to the inner wall of the tank 502. The oil outlet pipe 505 is made of flexible rubber, and a flow control valve is provided at the outlet of the oil outlet pipe 505 to adjust the flow rate of the lubricating oil according to actual needs. The outlet of the oil outlet pipe 505 is located at the contact point between the friction element 407 and the sliding element 403.

[0042] The top of the tank 502 is provided with an oil filling hole to facilitate the replenishment of lubricating oil into the tank 502. A connecting rod 601 is fixedly installed on the sliding plate 503. The connecting rod 601 moves through the tank 502 and is fixed to the outer wall of the sliding member 403 by the third bolt 602. When the sliding member 403 slides on the fixed rod 401, it will drive the connecting rod 601 and the sliding plate 503 to slide synchronously in the tank 502, thereby squeezing the lubricating oil out of the tank 502 and delivering it to the contact point between the friction member 407 and the sliding member 403 through the oil outlet pipe 505 to achieve automatic lubrication.

[0043] The specific working principle of the small coal pillar support structure for roadways along the goaf proposed in this embodiment is as follows:

[0044] In the initial state, the hydraulic push rod 2 extends, driving the support assembly 3 to rise. The flexible plate 305 contacts the top of the roadway, and the spring 304 is in its natural state, initially supporting the roadway. When the pressure from the top of the roadway acts on the flexible plate 305, the flexible plate 305 compresses the spring 304 through the first slide rod 303. The spring 304 absorbs the impact force. At the same time, the flexible plates 305 adapt to the shape of the roadway top and evenly distribute the support force through the mutual cooperation of the rotating plate 307, the rotating bar 309, and the second slide rod 310.

[0045] As the pressure increases, the hydraulic push rod 2 retracts under pressure, triggering the anti-retraction damping component 4 to work. The sliding part 403 slides on the fixed rod 401, and the friction force generated by the trapezoidal tooth structure of the friction part 407 and the sliding part 403 inhibits the retraction of the hydraulic push rod 2. The butterfly spring 409 further enhances the anti-retraction effect. During the retraction of the hydraulic push rod 2, the sliding part 403 drives the sliding plate 503 of the lubrication component 5 to move, squeezing out and delivering lubricating oil to the friction part of the anti-retraction damping component 4 to achieve automatic lubrication and reduce component wear. Through this working mechanism, this support structure can continuously and stably support the top of the roadway in complex roadway environments, ensuring the safe and smooth progress of coal mining operations.

[0046] This invention also discloses a method for supporting roadways with small coal pillars along the goaf, which further includes the following steps:

[0047] S1: First, start the hydraulic system to extend the hydraulic push rod 2 and drive the support assembly 3 to rise until the flexible plate 305 is in close contact with the top of the roadway. At this time, the spring 304 in the support assembly 3 is in the initial state. The flexible plate 305 relies on its own elasticity and anti-slip texture 7 to fit with the top of the roadway and provide initial support for the roadway. During this process, the rotating plate 307 and rotating bar 309 between the flexible plates 305 and the second slide bar 310 will automatically adjust their positions according to the shape of the top of the roadway to ensure that the flexible plate 305 can evenly distribute the support force and initially stabilize the top of the roadway.

[0048] S2: As the pressure at the top of the roadway gradually increases, the hydraulic push rod 2 begins to retract under pressure. At this time, the anti-retraction damping component 4 comes into play. The retraction of the hydraulic push rod 2 causes the first support plate 301 to move downward, thereby causing the sliding member 403 to slide in the insertion groove 402 of the fixed rod 401. Due to the trapezoidal toothed fit between the friction member 407 and the sliding member 403, a large frictional force is generated between them, which effectively suppresses the retraction of the hydraulic push rod 2. At the same time, the disc spring 409 deforms under the compression of the friction member 407, generating elastic force, which further pushes the friction member 407 and the sliding member 403 to fit tightly together, enhancing the anti-retraction damping effect and providing further support for the support component 3 to ensure the stability of the roadway top.

[0049] S3: During the retraction of the hydraulic push rod 2 under pressure, the sliding component 403 drives the connecting rod 601 and the sliding plate 503 to slide within the tank 502. As the sliding plate 503 moves, lubricating oil is squeezed out through the through hole 504 on its surface and transported to the contact point between the friction component 407 and the sliding component 403 via the oil outlet pipe 505. The flow rate of the lubricating oil can be adjusted by the flow control valve to ensure sufficient lubrication during the operation of the anti-shrinkage damping assembly 4, reduce wear between the two, extend the service life of the anti-shrinkage damping assembly 4, and ensure the long-term stable operation of the support structure.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A support structure for a small coal pillar roadway, comprising a support base (1) and a hydraulic push rod (2), wherein the hydraulic push rod (2) is fixedly mounted on the support base (1), and a support assembly (3) is fixedly installed on the extended end of the hydraulic push rod (2), the support assembly (3) being used to support the top of the roadway; characterized in that, Anti-retraction damping components (4) are symmetrically arranged on both sides of the hydraulic push rod (2); the anti-retraction damping components (4) suppress the amount of retraction when the hydraulic push rod (2) is compressed; the anti-retraction damping components (4) include a second support plate (405), a friction element (407) and two upper and lower fixed rods (401), the top end of the upper fixed rod (401) is fixedly connected to the support component (3), and the bottom end of the lower fixed rod (401) is fixedly connected to the support base (1); the ends of the upper and lower fixed rods (401) that are close to each other are connected to There is a sliding component (403); the lower fixed rod (401) is symmetrically equipped with second support plates (405) on both sides, and the bottom of the second support plate (405) is fixedly set on the support base (1). Friction components (407) are symmetrically arranged between the two second support plates (405); the opposite side of the two friction components (407) is in contact with the upper and lower sliding components (403); a lubrication assembly (5) is installed on the second support plate (405) to lubricate the anti-shrinkage damping assembly (4); Insert rods (406) are inserted into the inner wall of the second support plate (405); second sliding grooves (408) are provided on the side walls of the two friction elements (407), and the friction elements (407) slide with the outer side wall of the adjacent insert rods (406) through the second sliding grooves (408), so that the friction elements (407) can slide axially on the insert rods (406); a number of butterfly springs (409) are sleeved on the outer side wall of the insert rods (406), one end of the butterfly springs (409) is in contact with the friction elements (407), and the other end is in contact with the second support plate (405). The end of the insert rod (406) away from the butterfly springs (409) is fixed to the second support plate (405) by the second bolts (410); The lubrication assembly (5) includes a tank (502) for storing lubricating oil. A sliding plate (503) is slidably provided on the inner wall of the tank (502). Several through holes (504) are provided on the sliding plate (503). An oil outlet pipe (505) is connected to the inner wall of the tank (502). The outlet of the oil outlet pipe (505) is located at the contact point between the friction element (407) and the sliding element (403). A connecting rod (601) is fixedly provided on the sliding plate (503). The connecting rod (601) moves through the tank (502) and is fixed to the outer wall of the sliding element (403) by a third bolt (602). The support assembly (3) includes a first support plate (301), which is fixedly mounted on the extended end of the hydraulic push rod (2). A plurality of sleeves (302) are evenly distributed and fixedly mounted on the surface of the first support plate (301). A first sliding rod (303) is slidably mounted on the inner wall of each sleeve (302), and a spring (304) is fixedly mounted on the inner wall of each sleeve (302). The end of the first sliding rod (303) closest to the spring (304) is in close contact with the spring (304), and the end of the first sliding rod (303) in the same row away from the spring (304) is fixedly mounted... The same flexible plate (305) is placed; two adjacent flexible plates (305) are rotatably connected to each other on the side close to each other by a shaft pin (306). One flexible plate (305) has a rotating piece (307) rotatably set on the shaft pin (306), and a first sliding groove (308) is opened on the rotating piece (307). The other flexible plate (305) has rotating strips (309) rotatably set at both ends of the shaft pin (306). A second sliding rod (310) is fixedly set between the two rotating strips (309). The outer wall of the second sliding rod (310) slides in cooperation with the inner wall of the first sliding groove (308).

2. The small coal pillar support structure for roadways along the goaf according to claim 1, characterized in that, The upper and lower fixed rods (401) are provided with insertion slots (402) at their close ends. Sliding parts (403) are inserted into the two insertion slots (402). The outer wall of the fixed rod (401) is fixed to the sliding parts (403) by the first bolt (404).

3. The small coal pillar support structure for roadways along the goaf according to claim 1, characterized in that, The friction element (407) and the sliding element (403) are both arranged in a trapezoidal tooth shape at their contact points.

4. The small coal pillar support structure for roadways along the goaf according to claim 1, characterized in that, The lubrication assembly (5) also includes a third support plate (501), which is fixedly disposed on one side of the second support plate (405). A bearing groove is provided on the third support plate (501), and the tank (502) is placed in the bearing groove. A flow control valve is provided at the outlet of the oil outlet pipe (505).

5. A method for supporting roadways with small coal pillars along the goaf, characterized in that, The small coal pillar support structure for the goaf roadway as described in any one of claims 1-4 is adopted, and The following steps are involved: S1: First, the top of the roadway is initially supported by the support components (3); S2: Subsequently, the support assembly (3) is further supported by the anti-shrinkage damping assembly (4) and the amount of retraction of the hydraulic push rod (2) when it is compressed is suppressed; S3: The lubrication component (5) uses the retraction amount of the hydraulic push rod (2) to discharge lubricating oil to lubricate the anti-shrink damping component (4), thereby reducing the wear of the anti-shrink damping component (4) during damping.

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