Cantilever type supporting equipment for underground coal mine

Abstract

The utility model discloses an underground coal mine cantilever type supporting device which comprises a shoulder nest beam, a leg beam, a cable clamping device and a pull rod, the shoulder nest beam and the leg beam are connected through the cable clamping device to form a set of cantilever type supports, the lower end of the leg beam is fixedly connected to the ground, and the multiple sets of cantilever type supports are evenly arranged in the length direction of a roadway. The multiple cantilever type supports are fixedly connected through pull rods to form the whole support. According to the utility model, the local deformation position of the roadway is repaired, the arc-shaped beam, the straight leg part and the radian and the length of the leg beam in the shoulder nest beam are adjusted to adapt to the deformed part of the roadway, the roadway maintenance work amount is reduced, the roadway expansion range is reduced, and the roadway surrounding rock loosening circle development range is reduced; a plurality of groups of pull rods are used for interlocking a plurality of groups of cantilever type retractable supports to form a whole support, large support strength and support rigidity can be provided to adapt to surrounding rock deformation, meanwhile, the support has retractability, and the service life of a roadway support is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of underground coal mine supports, and particularly to a cantilever support device for underground coal mines. Background Technique

[0002] The roadway space in underground coal mines is the basic guarantee for the safe production of coal mines and one of the important conditions for maintaining the stability and safety of coal mines. However, under the conditions of high ground stress, "three-soft" coal seams, driving along the gob, and being affected by mining, problems such as aggravated roadway deformation, difficult support, and high maintenance frequency restrict the high-quality development of coal mines. The contradiction relationship with safe production has become particularly complex and urgent, and maintaining the long-term stability of roadways has become the key.

[0003] Most of the coal mines in the southwestern region of China are for the mining of close-distance coal seam groups, and most of them are coal and gas outburst coal seams. By means of mining protective layers, driving along the gob, etc. to prevent coal and outburst accidents, there are many influencing factors for roadway deformation and damage. Usually, one factor is the main factor and multiple factors are mixed, resulting in large differences in the damage degrees of different positions of the roadway. Under the influence of high ground stress, characteristics such as large deformation amount, fast deformation rate, and long duration of the surrounding rock of "three-soft" roadways gradually appear.

[0004] With the continuous development of support theories and support technologies, the roadway support concept has changed from passive support to active support, and more attention is paid to the combined support method of improving support resistance, support strength, and support density to form an overall combined support to change the stress state of the surrounding rock of the roadway. At present, under the influence of complex stresses such as developed bedding planes, poor stability, and low rock strength of the roof and floor rock layers, and being affected by goafs and mining, large-scale stress concentration appears on both sides of the roadway. The maximum stress value on the coal pillar side is greater than the maximum stress value on the solid coal side, showing a large local deformation of the roadway with asymmetry in both size and range, and its support and repair have become the difficulties and key points. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a cantilever support device for underground coal mines to solve the technical problems existing in the prior art.

[0006] The technical solution adopted by the utility model is as follows: A cantilever support device for underground coal mines includes a shoulder beam, a leg beam, a cable clamping device, and a pull rod. The shoulder beam and the leg beam are connected by the cable clamping device to form a set of cantilever supports. The lower end of the leg beam is fixedly connected to the ground. Multiple sets of cantilever supports are evenly arranged along the length direction of the roadway, and multiple sets of cantilever supports are fixedly connected by pull rods to form an overall support.

[0007] Further, the above-mentioned cantilever support device for underground coal mines further includes multiple cable anchor beams. The multiple cable anchor beams fixedly connect the formed overall cantilever support to the inner surface of the roadway. The cable anchor beam (5) is close to the pull rod and is located below the pull rod.

[0008] Furthermore, the above-mentioned cable anchor beam comprises a locking device, a cable anchor, an I-beam and an anchor plate. One side of the I-beam abuts against one side of the shoulder socket beam or the leg beam, and the other side abuts against the anchor plate. The anchor plate is penetrated by the cable anchor and locked by the locking device. The cable anchor is fixedly embedded into a cable anchor hole arranged in the roadway.

[0009] Furthermore, two groups of cable anchor beams are arranged at the top and near the upper middle part of the above-mentioned shoulder socket beam, and the two groups of cable anchor beams are arranged staggeredly.

[0010] Furthermore, one group of cable anchor beams is arranged near the bottom of the above-mentioned leg beam.

[0011] Furthermore, the above-mentioned shoulder socket beam comprises an arc beam and a first straight leg part. The lower end of the arc beam is fixedly integrated with the upper end of the first straight leg part. The arc beams are fixedly connected by two tie rods. One tie rod is arranged at the top of the arc beam, and the other tie rod is arranged in the middle of the arc beam.

[0012] Furthermore, a connecting ear is arranged on each of the above-mentioned arc beams. The tie rod is a threaded rod, and is locked by double nuts after passing through the connecting ear.

[0013] Furthermore, the above-mentioned leg beam comprises a second straight leg part and a leg plate. The lower end of the second straight leg part is fixedly connected with the leg plate. An installation through hole for fixation is arranged on the leg plate. The second straight leg parts are fixedly connected by a tie rod, and the tie rod is arranged near the middle part of the arc beam.

[0014] Furthermore, a plurality of iron back plates are arranged along the length direction between the above-mentioned shoulder socket beam and the leg beam and the roadway rock mass.

[0015] The beneficial effects of the utility model: Compared with the prior art, the utility model repairs local deformation positions according to the deformation characteristics of the roadway, adapts to the deformed part of the roadway by adjusting the arc beam, the straight leg part in the shoulder socket beam and the radian and length of the leg beam, reduces the amount of roadway maintenance work, reduces the roadway expansion range, reduces the development range of the loose circle of the roadway surrounding rock, and connects the shoulder socket beam and the leg beam through a cable clamp device, and interlocks multiple groups of cantilever telescopic supports by using multiple groups of tie rods to form a support whole, and can provide a relatively large support strength and support stiffness to adapt to the deformation of the surrounding rock, and at the same time has telescopicity to ensure the service life is extended when the roadway deforms again. The processing, installation and recovery of the support are relatively simple, the roadway expansion engineering quantity is reduced, the utilization rate of the roadway section can be effectively improved and the support cost can be reduced;

[0016] Active support is carried out by using cable anchor beams to keep the surrounding rock in a compressed state, thereby improving the integrity and strength of the rock mass, effectively controlling the displacement of the rock mass and promoting its stability. Through the anchoring effect of the cable anchors and the fixing of the cantilever yieldable support with I-beams, the overall performance of the cantilever yieldable support is improved, and the support strength and support stiffness of the yieldable support are fully exerted. Through the I-beams and iron backplates, the surrounding rock stress is evenly distributed on the support combination, ensuring that the overall force of the combined support is uniform and effectively preventing large-area support failure induced by local deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view structural schematic diagram of a cantilever yieldable support in a coal mine

[0018] Figure 2 is a side view structural schematic diagram of a cantilever yieldable support in a coal mine

[0019] Figure 3 is a structural schematic diagram of a shoulder socket beam

[0020] Figure 4 is a structural schematic diagram of a leg beam

[0021] Figure 5 is a structural schematic diagram of a cable anchor hole

[0022] Figure 6 is a structural schematic diagram of a cable anchor beam DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further introduced below in conjunction with specific embodiments.

[0024] Embodiment 1: As Figure 1-6 shown, a cantilever support device in a coal mine includes a shoulder socket beam 1, a leg beam 2, a cable clamp device 3 and a pull rod 4. A set of cantilever supports are formed by connecting the shoulder socket beam 1 and the leg beam 2 through the cable clamp device 3. The lower end of the leg beam 2 is fixedly connected to the ground. Multiple sets of cantilever supports are used and are evenly arranged along the length direction of the roadway. Multiple sets of cantilever supports are fixedly connected by the pull rod 4 to form an integral support, and the cable clamp device 3 uses multiple cable clamps.

[0025] In order to further improve the stability of the support, the cantilever support equipment in the coal mine underground also includes multiple cable beam 5s. The multiple cable beam 5s fixedly connect the formed integral cantilever support to the inner surface of the roadway, which can further improve the integrity of the support structure, has better rigidity and strength, and better stability. The cable beam 5 is close to the tie rod 4 and is located below the tie rod 4. The tie rod can provide a limiting function for the cable beam 5 to limit the displacement of the cable beam 5 during pre-tightening and pressure coming after construction, ensuring uniform force on the overall cantilever yielding support; The cable beam 5 includes a locking device 501, a cable 502, an I-beam 503, and an anchor plate 504. One side of the I-beam 503 abuts against one side of the shoulder socket beam 1 or the leg beam 2, and the other side abuts against the anchor plate 504. The anchor plate 504 has a cable 502 passing through it and is locked with a locking device 501. The cable 502 is fixedly embedded in the cable hole 505 provided in the roadway; Along the length direction, multiple iron backplates 6 are arranged between both the shoulder socket beam 1 and the leg beam 2 and the roadway rock mass. Active support is carried out using the cable beam 5 to keep the surrounding rock in a compressed state, thereby improving the integrity and strength of the rock mass, effectively controlling the displacement of the rock mass, and promoting its stability. Through the anchoring effect of the cable 502 and the fixing of the cantilever yielding support by the I-beam 503, the overall performance of the cantilever yielding support is improved, and the support strength and support stiffness of the yielding support are fully exerted. Through the I-beam 503 and the iron backplate 6, the surrounding rock stress is evenly distributed on the support combination, ensuring uniform force on the overall combined support and effectively preventing large-area support failure induced by local deformation; In order to improve the support effect, two groups of cable beam 5s are arranged at the top and near the upper middle part of the shoulder socket beam 1, and the two groups of cable beam 5s are arranged staggeredly; One group of cable beam 5s is arranged near the bottom of the leg beam 2.

[0026] Among them, the shoulder socket beam 1 includes an arc beam 101 and a first straight leg part 102. The lower end of the arc beam 101 and the upper end of the first straight leg part 102 are fixed as an integral structure. The arc beams 101 are fixedly connected by two tie rods 4. One tie rod 4 is arranged at the top of the arc beam 101, and the other tie rod 4 is arranged in the middle of the arc beam 101; In order to facilitate the installation of the tie rod, a connecting ear 103 is provided on each arc beam 101. The tie rod 4 uses a threaded rod, and after passing through the connecting ear 103, it is locked with double nuts. This structure is convenient and fast to install, and with multiple tie rods tightened, the overall supportability is better.

[0027] Among them, the leg beam 2 includes a second straight leg part 201 and a leg plate 202. The lower end of the second straight leg part 201 is fixedly connected with the leg plate 202. The leg plate 202 is provided with an installation through hole for fixing. The second straight leg parts 201 are fixedly connected by a tie rod 4. The tie rod 4 is arranged near the middle of the arc beam 101. This structure is convenient and fast to install, the tie rod is tightened, and the overall supportability is better. The second straight leg part 201 is also provided with a connecting ear for connecting the tie rod.

[0028] By designing a cantilever collapsible support, the stiffness and strength of the support in the side pressure deformation section of the roadway are improved. Multiple groups of tie rods are interlocked to form an integral support. A cable beam structure is formed by combining cables and I-beams to improve the stress state of the surrounding rock, realize the control of the side pressure deformation of the roadway, thereby reducing the deformation rate of the two sides of the roadway under complex stresses, further extending the service life of the roadway, reducing the maintenance workload of the mine roadway, and ensuring the space required for the safe production of the mine.

[0029] Embodiment 2: The construction method of the cantilever support equipment in the coal mine underground. The method is as follows: After the roadway with serious deformation is opened or excavated, the roadway is in an unsupported state. Install a cantilever collapsible support and temporarily fix it by using a roof column or point anchoring method. Uniformly arrange iron backplates between the collapsible support and the rock mass. Install the upper tie rod, the middle tie rod, and the lower tie rod on the collapsible support and complete the fastening to initially form an integral body. Then construct cables to assist in fixing the collapsible support, install I-beams, ensure that the cables pass through the cable holes of the I-beams, and make the three groups of I-beams located below the upper tie rod, the middle tie rod, and the lower tie rod. Install anchor plates and locks, and tighten the cables to make the collapsible support closely adhere to the rock mass under the action of the pre-tightening force of the cables. The cable beams are arranged staggeredly to form an active and passive combined support integral body.

[0030] As mentioned above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A cantilever support device for underground coal mines, characterized in that: It includes a shoulder socket beam (1), a leg beam (2), a cable clip device (3) and a tie rod (4). A set of cantilever supports are formed by connecting the shoulder socket beam (1) and the leg beam (2) through the cable clip device (3). The lower end of the leg beam (2) is fixedly connected to the ground. Multiple sets of cantilever supports are used and arranged evenly along the length direction of the roadway. The multiple sets of cantilever supports are fixedly connected by the tie rod (4) to form an integral support; the cable anchor beam (5) includes a locking device (501), a cable anchor (502), an I-beam (503) and an anchor plate (504). One side of the I-beam (503) abuts against one side of the shoulder socket beam (1) or the leg beam (2), and the other side abuts against the anchor plate (504). The anchor plate (504) is penetrated by the cable anchor (502) and locked by the locking device (501). The cable anchor (502) is fixedly embedded in the cable anchor hole provided in the roadway.

2. The cantilever support equipment for underground coal mines according to claim 1, characterized in that: It further includes multiple cable anchor beams (5). The multiple cable anchor beams (5) fixedly connect the integral cantilever supports to the inner surface of the roadway. The cable anchor beams (5) are closely attached to the tie rod (4) and are located below the tie rod (4).

3. The cantilever support equipment for underground coal mines according to claim 1, characterized in that: Two sets of cable anchor beams (5) are arranged at the top and near the upper middle part of the shoulder socket beam (1). The two sets of cable anchor beams (5) are arranged staggeredly.

4. The cantilever support equipment for underground coal mines according to claim 3, wherein: One set of cable anchor beams (5) is arranged near the bottom of the leg beam (2).

5. The cantilever support equipment for underground coal mines according to claim 3, characterized in that: The shoulder socket beam (1) includes an arc beam (101) and a first straight leg part (102). The lower end of the arc beam (101) and the upper end of the first straight leg part (102) are fixed into an integral structure. The arc beams (101) are fixedly connected by two tie rods (4). One tie rod (4) is arranged at the top of the arc beam (101), and the other tie rod (4) is arranged in the middle of the arc beam (101).

6. The cantilever support equipment for underground coal mines according to claim 3, characterized in that: A connecting ear (103) is provided on each arc beam (101). The tie rod (4) is a threaded rod and is locked by double nuts after passing through the connecting ear (103).

7. The cantilever support equipment for underground coal mines according to claim 1, characterized in that: The leg beam (2) includes a second straight leg part (201) and a leg plate (202). The lower end of the second straight leg part (201) is fixedly connected with the leg plate (202). An installation through hole for fixing is provided on the leg plate (202). The second straight leg parts (201) are fixedly connected by the tie rod (4), and this tie rod (4) is arranged near the middle of the arc beam (101).

8. The cantilever support equipment for underground coal mines according to claim 1, characterized in that: Multiple iron backplates (6) are arranged along the length direction between the shoulder socket beam (1) and the leg beam (2) and the roadway rock mass.

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