[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0031] In order to solve the problem of poor pressure relief effect of the pressure relief tray in the current coal mine roadway anchor cable support system, the present invention provides a coal mine roadway anchor cable support system, see figure 1 , figure 2 As shown, the coal mine roadway anchor cable support system includes a roadway 1, an anchor cable 2, a pressure letting tray 3, and an anchor 4; wherein the letting pressure tray 3 is connected to the inner side of the roadway 1; the letting pressure tray 3 includes a circular arc The tray 32 and the bottom plate 33 of the convex structure are fixedly connected to the bottom plate 33, and the bottom plate 33 is fixedly connected to the lane 1; the tray 32 includes an inner tray 321 and an outer tray 322 arranged adjacently, and an inner tray 321 and an outer layer A gap is provided between the trays 322; the anchor cable 2 passes through the pressure letting tray 3 and the roadway 1 in turn and is placed inside the surrounding rock, and the anchor rope 2 and the pressure letting tray 3 are fixedly connected by anchors 4.
[0032] In this application, the inner side of the roadway 1 refers to the side of the roadway 1 away from the surrounding rock; the anchor cable 2 passes through the roadway 1 and is placed in the surrounding rock outside the roadway 1 to reduce the roof separation of the roadway 1 and increase the surrounding rock The stability.
[0033] In order to improve the stability of the roof structure of the roadway 1, the coal mine roadway anchor cable support system provided by the present application is provided with a pressure relief tray 3 inside the roadway 1, so that the anchor cable 2 is connected to the roadway 1 and the surrounding rock through the pressure relief tray 3, In order to spread and transfer part of the stress through the pressure-relief effect of the pressure-relief tray 3, reduce stress concentration, slow the roof separation of the roadway 1, improve the stability of the roadway roof structure, and improve the safety of production.
[0034] Specifically, let the tray 32 with a circular arc-shaped convex structure in the pressure tray 3 be used for pressure relief, and the convex structure bulges toward the inside of the roadway 1; the tray 32 that plays the role of pressure relief is designed as a circular arc The protruding structure is beneficial to improve the elasticity of the tray 32, increase the pressing distance, and improve the bearing capacity; further, the tray 32 in the present application includes an inner tray 321 and an outer tray 322 that are arranged adjacently, that is, the inner tray 321 and the The inner wall of the tunnel 1 is arranged adjacently, the outer tray 322 is farther away from the inner wall of the tunnel 1 than the inner tray 321, and a gap is provided between the inner tray 321 and the outer tray 322, and the pressure relief effect is further increased through the gap; In the process of use, firstly, the pressure is relieved by the deformation of the outer tray 322. As the stress increases, when the outer tray 322 deforms so as to lose a certain bearing capacity, the inner tray 321 begins to deform and bear the load. Capacity, and the outer tray 322 together to play the role of pressure relief, so that the pressure relief capacity of the pressure tray 3 is hierarchical and flexible, improve the pressure relief capacity and load-bearing capacity of the pressure tray 3, reduce stress concentration, and slow down The roof of the roadway 1 is separated to improve the stability of the roof structure of the roadway and the safety of production.
[0035] When using this coal mine roadway anchor cable support system, the bottom plate 32 of the pressure pallet 3 is fixed to the inner wall of the roadway 1, so that the anchor cable 2 passes through the pressure pallet 3 and the roadway 1, and is placed in the surrounding rock outside the roadway 1. , And then fix the anchor cable 2 outside the pressure pallet 3 through the anchors 4, that is, the part on the side of the pressure pallet 3 away from the roadway 1, to achieve the installation of the anchor cable 2.
[0036] See figure 2 As shown, in order to improve the connection strength of the anchor cable 2, the coal mine roadway anchor cable support system provided by the present application further includes a pressure-bearing member 5, which is arranged between the anchor member 4 and the pressure-relief tray 3. When the cable 2 is installed, the anchor cable 2 is passed through the pressure bearing member 5, the pressure tray 3, and the roadway 1 are placed into the surrounding rock. In order to facilitate the passage of the anchor cable 2 through the pressure-bearing member 5, a mounting hole adapted to the size of the anchor cable 2 is provided on the pressure-bearing member 5, so that the anchor cable 2 passes through the pressure-bearing member 5 through the mounting hole.
[0037] The pressure-bearing member 5 is used to bear a certain load-bearing capacity, and can be a solid steel plate with a drilled structure, or a hollow steel plate with a drilled structure; in the present application, the pressure-bearing member 5 is preferably with a drilled structure The hollow steel plate in order to make the hollow steel plate bear the load-bearing capacity, and at the same time, it can also play a certain pressure relief effect through the hollow structure, thereby further reducing the stress concentration, slowing the roof separation of the roadway 1 and improving the roadway roof The stability of the structure improves the safety of production.
[0038] In order to improve the bearing capacity of the pressure-relief tray 3, the material of the inner tray 321 and the outer tray 322 is preferably steel plate in this application; the steel plate can be a thin-layer steel plate.
[0039] In order to expand the scope of use of the coal mine roadway anchoring system, the bottom plate 33 of the pressure pallet 3 in this application includes a first bottom plate 331 fixedly connected to the inner layer pallet 321, and a second bottom plate 332 fixedly connected to the outer layer pallet 322 .
[0040] The first bottom plate 331 and the second bottom plate 332 are connected to the inner wall of the roadway 1; the bottom plate 33 is designed as a first bottom plate 331 and a second bottom plate 332 independent of each other, and the inner tray 321 and the outer tray 322 pass through The first bottom plate 331 and the second bottom plate 332, which are independent of each other, are connected to the tunnel 1, so that the inner tray 321 and the outer tray 322 have a certain degree of independence. During use, the inner tray 321 and the outer tray 322 They can be mutually rotated within a certain angle range, so that not only the pressure tray 3 can be applied to the anchor cables 2 of various installation angles, but also can be increased by the mutual rotation between the inner tray 321 and the outer tray 322. Let the pressure pallet 3 have a buffering effect to avoid the surrounding of the pressure pallet 3 from tilting due to large ground stress or the mismatch between the installation angle of the anchor cable 2 and the pressure pallet 3, resulting in poor pressure reduction and bearing effects of the pressure pallet , So as to improve the pressure relief capacity and bearing capacity of the pressure relief tray 3, and expand the application scope of the coal mine roadway anchor cable support system.
[0041] In order to improve the mechanical properties of let pressure tray 3, see figure 2 As shown, the pressure letting tray 3 in the present application further includes a tray baffle 34, one end of the tray baffle 34 is connected to the first bottom plate 331, and the other end is connected to the outer tray 322.
[0042] The outer tray 322 is connected to the first bottom plate 331 through the tray baffle 34, on the one hand, the tray baffle 34 can apply a supporting force to the outer tray 322, thereby playing a role of strengthening the outer tray 322, on the other hand, Because the first bottom plate 331 is connected to the inner tray 321, the outer tray 322 is connected to the first bottom plate 331 through the tray baffle 34, and the relative position between the inner tray 321 and the outer tray 322 can also be restricted. , Thereby improving the stability of the structure of the pressure tray 3.
[0043] In addition, in order to increase the supporting effect of the anchor cable support system on the surrounding rock in the coal mine roadway, see image 3 As shown, in the present application, the anchor cable 2 is arranged obliquely, and it is further preferred that the angle between the anchor cable 2 and the section of the roadway 1 is 75°.
[0044] The section of the roadway 1 in the present application specifically refers to the section of the roadway 1 where the anchor cable 2 is located, which is in the same plane as the anchor cable 2; by inclining the anchor cable 2, the drilling direction of the anchor cable 2 is changed to Inclined drilling makes the anchor cable 2 inclined into the surrounding rock outside the roadway 1, thereby increasing the compression and reinforcement of the anchor cable 2 on the surrounding rock. Through the squeezing force and friction, each rock layer in the surrounding rock The gaps between the bedding, joints, and cracks are reduced, thereby improving the supporting effect of the anchor cable 2 on the surrounding rock.
[0045] Because the anchor cable 2 needs to pass through the pressure pallet 3 before being placed in the surrounding rock, the corresponding position of the pressure pallet 3 needs to be provided with holes that are compatible with the anchor cable 2; when the anchor cable 2 is inclined, it is convenient for the anchor cable 2 Tilt through the let pressure tray 3, see Figure 4 As shown, in the present application, a strip hole 31 is provided on the pressure letting tray 3, and the length of the strip hole 31 is greater than the outer diameter of the anchor rope 2; the anchor rope 2 passes through the strip hole 31 and the roadway 1 in turn. Rock interior.
[0046] Specifically, since the pressure tray 3 in this application includes an inner tray 321 and an outer tray 322, in order to enable the inclined anchor cable 2 to pass through the pressure tray 3 obliquely, the inner tray 321 corresponds to the outer tray 322 A strip hole 31 is provided in each position.
[0047] By providing a strip hole 31 on the pressure letting tray 3, while ensuring that the anchor cable 2 can pass through the pressure letting tray 3 obliquely, the strip hole 31 can also play a certain buffering effect to improve the pressure letting tray 3 The pressure relief capacity and bearing capacity of the mine expand the scope of application of the anchor cable support system in coal mine roadways.
[0048] See Figure 5 As shown, the number of anchor cables 2 in the coal mine roadway anchor cable support system is multiple; in this application, multiple anchor cables 2 are arranged in rows.
[0049] Multiple anchor cables 2 are provided to support the surrounding rock, and the multiple anchor cables 2 are arranged obliquely to form a multi-angle anchor cable arrangement in a three-dimensional space, so that the multiple anchor cables 2 work together to provide the surrounding rock The transverse stress components in multiple directions can increase the friction and squeezing force between the anchor cable 2 and the surrounding rock, and increase the integrity of the surrounding rock within the range of the anchor cable 2. The elastic strain makes the surrounding rock in the action unit of each anchor cable 2 deform in coordination with the anchor cable 2, increasing the support contribution of the anchor cable 2, increasing the integrity of the anchor cable 2 and the surrounding rock, and reducing individual anchor cable 2 fractures This phenomenon can improve the supporting effect of the anchor-cable supporting system of coal mine tunnels.
[0050] Because coal and rock are not strictly stratified in the strike direction of the roadway 1, but have high non-uniformity, and the joints and cracks are irregularly distributed, which makes the anchor cable 2 inclined in the direction along the strike of the roadway 1. A certain angle can effectively weaken the influence of the irregular distribution of joints and fissures on the support effect of the roadway 1, and effectively avoid the fracture of individual anchor cables 2.
[0051] In addition, in order to improve the supporting effect of the anchor cable support system in coal mine roadways, uneven anchoring can also be considered, such as different anchor cable lengths, segmented anchoring, etc.; the combined supporting effect of anchor rods and anchor cables, and inclined The anchor cable increases the integrity of the surrounding rock in the range of action, and also improves the effect between the anchor rod and the surrounding rock, and can reduce the phenomenon of anchor bolt withdrawal.
[0052] In order to further increase the range of action of the inclined anchor cable 2, different anchor cables 2 can be set to different inclined directions; for details, see Figure 5 As shown, the anchor cables 2 are arranged in rows. In order to increase the range of the anchor cables 2, the inclination directions of the anchor cables 2 in adjacent rows can be opposite, or the inclination directions of the anchor cables 2 adjacent in the same row can be opposite. .
[0053] See Figure 5 As shown, the present application takes the arrangement of the anchor cables 2 in five rows as an example for description; when the inclination directions of the anchor cables 2 in adjacent rows are opposite, refer to image 3 , Image 6 As shown, the anchor cables 2 in the first, third, and fifth rows are inclined to the right, and the anchor cables 2 in the second and fourth rows are inclined to the left, so that the anchor cables 2 in adjacent rows can form The three-dimensional structure provides lateral stress in multiple directions to the surrounding rock and improves the supporting effect of the anchor cable support system of coal mine roadways. The directions specifically referred to by "left" and "right" in this application refer to the directions shown by the indicators in the drawings.
[0054] For example, this application provides the following cases for detailed explanation:
[0055] Along the longitudinal section of the roadway 1, the anchor cable holes are arranged in a plum blossom shape, and the size of the anchor cable 2 is The row spacing is 1000×1000mm, and the vertical road top contour line is installed in the middle of the roadway 1; the drilling inclination angle is 75°, and the two rows of longitudinally connected anchor cables 2 are inclined in opposite directions.
[0056] Similarly, when the inclination directions of the anchor cables 2 adjacent in the same row are reversed, see Figure 7 As shown, the inclination directions of the two adjacent anchor cables 2 in each row are opposite, so that the anchor cables 2 can form a three-dimensional structure, provide lateral stress in multiple directions to the surrounding rock, and improve the anchor cable support of coal mine roadways. The support effect of the protection system.
[0057] For example, this application provides the following cases for detailed explanation:
[0058] Along the longitudinal section of the roadway 1, the anchor cable holes are arranged at intervals of quincunx holes, and the size of the anchor cable 2 is The row spacing is 1000×1000mm, the vertical road top contour line is installed in the middle of the roadway 1; the borehole is inclined at an angle of 75°, and the longitudinally adjacent anchor cables 2 are arranged in the opposite direction.
[0059] In summary, the coal mine roadway anchor cable support system provided by the present application has a simple structure, is easy to operate, has good pressure relief capacity and bearing capacity, and has a wide range of applications.
[0060] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.
