Inserted-piece butterfly-shaped buffer energy-absorbing structure for supporting coal mine roadway and coal mine roadway supporting method

Abstract

The present invention provides a flake-type butterfly buffer energy-absorbing structure for supporting coal mine roadways and a method for supporting coal mine roadways, which relates to the technical field of roadway support and is invented to reduce the hazards of rock bursts. The flake-type buffer energy-absorbing structure for supporting coal mine roadways includes a circular tube seat and a disc plate assembly; the circular tube seat includes a lower-section circular tube and an upper-section circular tube; the upper-section circular tube is arranged at the upper end of the lower-section circular tube, and the axis of the upper-section circular tube and the axis of the lower-section circular tube are on the same straight line; the lower-section circular tube and the upper-section circular tube are connected by a bending section; the disc plate assembly is arranged inside the lower-section circular tube. The above-mentioned flake-type butterfly buffer energy-absorbing structure is adopted in the method for supporting underground coal mine roadways. The flake-type butterfly buffer energy-absorbing structure for supporting coal mine roadways provided by this application is applicable to the support of underground coal mine roadways.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine roadway support, and particularly relates to a plug-in butterfly-shaped buffer energy-absorbing structure for coal mine roadway support and a coal mine roadway support method. Background Art

[0002] In existing coal mine roadways, due to construction and use safety requirements, a support system needs to be designed to resist the surrounding rock pressure. The commonly used support materials and equipment for coal mine roadways mainly include bolts (cables), shed supports, and hydraulic supports, etc. The anti-bumping support design for dealing with rock bursts is also mostly expanded and combined based on these support forms. They mostly start from aspects such as improving the stiffness of the support structure and cannot meet the safety requirements of coal mine roadways. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies in the above technologies and propose a plug-in butterfly-shaped buffer energy-absorbing structure for coal mine roadway support and a coal mine roadway support method, which are convenient for improving the stability and reliability of coal mine roadway support.

[0004] In the first aspect, the present invention provides a plug-in butterfly-shaped buffer energy-absorbing structure for coal mine roadway support. The buffer energy-absorbing structure includes a circular tube seat and a disc plate assembly; the circular tube seat includes a lower circular tube and an upper circular tube; the upper circular tube is arranged at the upper end of the lower circular tube, and the axis of the upper circular tube and the axis of the lower circular tube are on the same straight line; the lower circular tube and the upper circular tube are connected by a bent section; the disc plate assembly is arranged inside the lower circular tube.

[0005] In some embodiments, the disc plate assembly is integrally movably arranged inside the lower circular tube; the disc plate assembly includes a rib plate insert and a plurality of ribs; a plurality of sockets are evenly arranged in the circumferential direction of the rib plate insert; one end of the rib has a notch; each rib is respectively inserted into a socket through its notch.

[0006] In some embodiments, the rib plate insert is a disc structure, and the rib plate insert is arranged horizontally at the central position of the lower circular tube; the rib plate insert is concentric with the lower circular tube; the ribs are clamped vertically inside the sockets.

[0007] In some embodiments, the rib is a cuboid structure; the length L1 of the rib ranges from 50 to 70 mm; the height h1 of the rib ranges from 40 to 60 mm; the thickness B1 of the rib ranges from 6 to 10 mm; the distance h5 from the bottom surface of the notch to the rib ranges from 20 to 30 mm; the vertical height h6 of the notch ranges from 4 to 6 mm; the horizontal depth L6 of the notch ranges from 15 to 25 mm; the width B2 of the notch ranges from 2 to 4 mm.

[0008] In some embodiments, the radius of the rib plate insert The value range is 50 - 70 mm, the thickness h2 of the rib plate insertion plate ranges from 4 - 8 mm; the depth L2 of the socket ranges from 15 - 25 mm; the width B2 of the socket ranges from 6 - 10 mm; the distance R between the end of the rib plate away from the rib plate insertion plate and the inner wall of the lower circular pipe is 2 - 4 mm.

[0009] In some embodiments, the radius of the lower circular pipe has a value range of 80 - 110 mm; the height h3 of the lower circular pipe ranges from 100 - 150 mm; the wall thickness B3 of the lower circular pipe ranges from 7 - 11 mm.

[0010] In some embodiments, the radius R of the upper circular pipe is less than the radius of the lower circular pipe by 3 mm to 5 mm; the height h4 of the upper circular pipe ranges from 40 - 50 mm; the wall thickness B4 of the upper circular pipe ranges from 8 - 12 mm; the wall thickness B4 of the upper circular pipe is greater than the wall thickness B3 of the lower circular pipe.

[0011] In some embodiments, the bending section is integrally formed with the lower circular pipe and the upper circular pipe respectively; the bending section includes a convex peak section and a concave valley section, and the maximum distance h between the convex peak section and the concave valley section is 3 mm to 5 mm.

[0012] In some embodiments, the circular pipe seat is a metal circular pipe, and the materials of the disc plate assembly are all Q235 steel.

[0013] In some embodiments, the bending section is designed as an inclined surface structure, and the inclination of the bending section is designed to be 4° to 13°.

[0014] In some embodiments, the buffer and energy absorption structure is used for the bottom support of the coal mine roadway support; the buffer and energy absorption structure is connected to the hydraulic support of the coal mine roadway through the circular pipe seat; the hydraulic support is sleeved on the upper circular pipe.

[0015] In a second aspect, the present invention provides a method for supporting an underground coal mine roadway, including:

[0016] Laying a butt - joint first anti - impact floor and a second anti - impact floor on the floor of the underground coal mine roadway;

[0017] An intermediate hinge seat is arranged on the upper surface at the butt joint seam of the first end of the first impact-resistant bottom plate and the first end of the second impact-resistant bottom plate; the intermediate hinge seat is fixedly connected to the first end of the first impact-resistant bottom plate and the first end of the second impact-resistant bottom plate respectively; the lower section of the circular tube of the circular tube seat of the third buffer energy absorption structure is hinged on the intermediate hinge seat; the sleeve fixedly connected to the bottom end of the third hydraulic support is sleeved on the outer side of the upper section of the circular tube of the circular tube seat of the third buffer energy absorption structure; the top end of the third hydraulic support is hinged to the second end of the first roof support and the second end of the second roof support respectively through a hinge shaft; wherein, the first end of the first roof support is hinged to the second end of the first impact-resistant bottom plate through a first intermediate support, and the second end of the second roof support is hinged to the second end of the second impact-resistant bottom plate through a second intermediate support;

[0018] Adjust the elongation length of the third hydraulic support so that both the first roof support and the second roof support are in contact with the arched top of the roadway, and make the third hydraulic support in a vertical state.

[0019] Optionally, the second end of the first impact-resistant bottom plate has a first bearing seat, and the first bearing seat has a first hinge position and a second hinge position; the second end of the second impact-resistant bottom plate has a second bearing seat, and the second bearing seat has a third hinge position and a fourth hinge position;

[0020] The first end of the first intermediate support is hinged at the first hinge position, the lower section of the circular tube of the circular tube seat of the first buffer energy absorption structure is hinged at the second hinge position, and the sleeve fixedly connected to the bottom end of the first hydraulic support is sleeved on the outer side of the upper section of the circular tube of the circular tube seat of the first buffer energy absorption structure; the first end of the first roof support is hinged to the second end of the first intermediate support, and the sub-hinge position of the first roof support is hinged to the top end of the first hydraulic support;

[0021] The first end of the second intermediate support is hinged at the third hinge position, the lower section of the circular tube of the circular tube seat of the second buffer energy absorption structure is hinged at the fourth hinge position, and the sleeve fixedly connected to the bottom end of the second hydraulic support is sleeved on the outer side of the upper section of the circular tube of the circular tube seat of the second buffer energy absorption structure; the first end of the second roof support is hinged to the second end of the second intermediate support, and the sub-hinge position of the second roof support is hinged to the top end of the second hydraulic support.

[0022] The present application provides a plug-in butterfly buffer energy absorption structure for supporting coal mine roadways and an underground coal mine roadway support method. The plug-in butterfly buffer energy absorption structure includes a circular pipe seat and a disc plate assembly. The circular pipe seat includes a lower circular pipe and an upper circular pipe. The upper circular pipe is arranged at the upper end of the lower circular pipe, and the axis of the upper circular pipe and the axis of the lower circular pipe are on the same straight line. The lower circular pipe and the upper circular pipe are connected by a bent section. The disc plate assembly is arranged inside the lower circular pipe. For the buffer energy absorption structure provided by the present invention, when under the action of rock burst, at the bent section between the lower circular pipe and the upper circular pipe, the wall of the lower circular pipe will be driven to move downward and turn over, and the impact energy is initially dissipated by the bending deformation when the wall of the lower circular pipe turns over. When the bent section contacts the disc plate assembly, a multi-chamber thin-wall structure will be formed, and the impact energy is absorbed by means of collapse plastic buckling to achieve secondary energy absorption. Therefore, the buffer energy absorption structure designed by the present invention can absorb the impact energy under any working conditions, improve the energy absorption level, and greatly improve the safety of roadway support. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0024] The present invention will be further described below with reference to the drawings:

[0025] Figure 1 is a perspective view of a buffer energy absorption structure of the present invention.

[0026] Figure 2 is a front view of a buffer energy absorption structure of the present invention.

[0027] Figure 3 is of the present invention Figure 2 enlarged schematic view of partial B.

[0028] Figure 4 is a cross-sectional view of a buffer energy absorption structure of the present invention.

[0029] Figure 5 is a top view of a buffer energy absorption structure of the present invention.

[0030] Figure 6 is a schematic view of the use state of a buffer energy absorption structure of the present invention.

[0031] Figure 7 is a schematic view of a rib plate structure of the present invention;

[0032] Figure 8 is an underground coal mine roadway support system formed according to an embodiment of the present invention.

[0033] In the figure: 1. Lower circular pipe; 2. Upper circular pipe; 3. Bending section; 31. Convex peak section; 32. Concave valley section; 4. Rib plate insertion plate; 5. Rib plate; 6. Hydraulic support. Detailed implementation mode

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] As shown in Figures 1 to Figure 6As shown in the figure, the present invention provides an insert-type butterfly buffer energy-absorbing structure for supporting coal mine roadways, which is applied to the buffer support of coal mine roadway supports to achieve the energy absorption of rock bursts on the roadway floor. Specifically, the insert-type butterfly buffer energy-absorbing structure includes a circular tube seat and a disc plate assembly; among them, the circular tube seat includes a lower circular tube 1 and an upper circular tube 2; the upper circular tube 2 is arranged at the upper end of the lower circular tube 1, and the axis of the upper circular tube 2 and the axis of the lower circular tube 1 are on the same straight line, that is, the lower circular tube 1 and the upper circular tube 2 are coaxially arranged. Further, the lower circular tube 1 and the upper circular tube 2 are connected by a bending section 3; the bending section 3 is a flanging structure formed between the lower circular tube 1 and the upper circular tube 2, which can play a buffering role during energy impact and achieve energy absorption. Further, the upper circular tube 2 is used to connect with the hydraulic support 6 of the coal mine roadway support. Further, the disc plate assembly is arranged inside the lower circular tube 1, so that when the hydraulic support 6 is subjected to energy impact, it acts on the disc plate assembly through the bending section 3 to achieve the first-stage energy absorption. The buffer energy-absorbing structure provided by the present invention can, during the action of rock bursts, cause the wall of the lower circular tube to move downward and flip at the bending section between the lower circular tube and the upper circular tube, and the impact energy is initially dissipated by the bending deformation when the wall of the lower circular tube flips. When the bending section contacts the disc plate assembly, a multi-chamber thin-wall structure will be formed, and the impact energy is absorbed by the way of collapse plastic buckling to achieve the second-stage energy absorption. Therefore, the buffer energy-absorbing structure designed by the present invention can absorb the impact energy under any working conditions, improve the energy absorption level, and greatly improve the safety of roadway support.

[0040] As shown in FIGS. 1 to Figure 7 As shown in the figure, in some embodiments, the disc plate assembly is integrally movably arranged inside the lower circular tube 1, so as to better achieve the absorption of impact energy by the way of collapse plastic buckling. Further, the disc plate assembly includes a rib plate insert 4 and a plurality of rib plates 5, and the rib plate insert 4 and the rib plates 5 are respectively flat plate structures; among them, a plurality of sockets are evenly arranged in the circumferential direction of the rib plate insert 4; one end of the rib plate 5 is provided with a notch 51. Specifically, each rib plate 5 is respectively inserted into a socket through its notch 51 to form an integral structure with the rib plate insert 4. In the above structure, the sockets designed on the rib plate insert 4 and the notches 51 designed on the rib plates 5 only need to align the notches and sockets and insert them during installation, and the installation is relatively convenient.

[0041] As shown in FIGS. 1 to Figure 6As shown, in some embodiments, the rib plate insert 4 is a disc structure, which can reasonably and maximally install the rib plates 5. Considering actual research, the rib plates 5 are preferably designed to be 7 to 8, so as to maximally achieve buffering and energy absorption. Further, the rib plate insert 4 is arranged horizontally at the central position of the lower circular tube 1, and the rib plate insert 4 is concentric with the lower circular tube 1 to achieve the best buffering state. Further, the rib plates 5 are clamped vertically in the socket, so that each rib plate 5 is perpendicular to the rib plate insert 4 respectively, forming a collapse plastic buckling buffer structure.

[0042] As Figure 7 shown, in some embodiments, the rib plate 5 is a cuboid structure. Specifically, the length L1 of the rib plate 5 ranges from 50 to 70 mm, preferably 60 mm. The height h1 of the rib plate 5 ranges from 40 to 60 mm, preferably 50 mm. The thickness B1 of the rib plate 5 ranges from 6 to 10 mm, preferably 7 or 8 mm. The distance h5 from the bottom surface of the notch 51 of the rib plate 5 to the bottom of the rib plate 5 ranges from 20 to 30 mm, preferably 25 mm. The vertical height h6 of the notch 51 ranges from 4 to 6 mm, preferably 5 mm. The horizontal depth L6 of the notch 51 ranges from 15 to 25 mm, preferably 20 mm. The width B2 of the notch 51 ranges from 2 to 4 mm, preferably 3 mm. It should be emphasized that the above dimensions of the rib plate 5 and its notch 51 are designed based on actual research and can achieve a better collapse effect in practical applications.

[0043] As shown in FIGS. 1 to Figure 6 shown, in some embodiments, the rib plate insert 4 is a disc structure, and the radius of the rib plate insert 4 ranges from 50 to 70 mm, preferably 60 mm. The thickness h2 of the rib plate insert 4 ranges from 4 to 8 mm, preferably 6 mm; the depth L2 of the socket ranges from 15 to 25 mm, preferably 20 mm. The width B2 of the socket ranges from 6 to 10 mm, preferably 8 mm. The distance R between the end of the rib plate 5 far from the rib plate insert 4 and the inner wall of the lower circular tube 1 is 2 to 4 mm, preferably 3 mm. It should be emphasized that the above dimensions of the rib plate insert 4 are designed based on actual research and, combined with the dimensions of the rib plate 5 and its notch 51, can achieve a better collapse effect in practical applications.

[0044] As shown in FIGS. 1 to Figure 6 shown, in some embodiments, the radius of the lower circular tube 1 The value range of [[ ]] is 80 - 110 mm, preferably 90 mm. The height h3 of the lower circular tube 1 has a value range of 100 - 150 mm, preferably 140 mm. The wall thickness B3 of the lower circular tube 1 has a value range of 7 - 11 mm, preferably 9 mm. It should be emphasized that: the dimensions of the lower circular tube 1 are designed in combination with the dimensions of the rib plate insertion plate 4, the rib plate 5 and its notch 51, and good assembly and buffering effects can be achieved.

[0045] As shown in FIGS. 1 to Figure 6 shown, in some embodiments, the radius R of the upper circular tube 2 is 3 - 5 mm less than the radius of the lower circular tube 1, preferably 4 mm. Referring to Figure 3 shown, that is, the value range of H is 1.5 - 2.5 mm, preferably 2 mm. The height h4 of the upper circular tube 2 has a value range of 40 - 50 mm, preferably 45 mm. The wall thickness B4 of the upper circular tube 2 has a value range of 8 - 12 mm, preferably 10 mm. The wall thickness B4 of the upper circular tube 2 is greater than the wall thickness B3 of the lower circular tube 1. It should be emphasized that: the dimensions of the upper circular tube 2 are designed in combination with the dimensions of the lower circular tube 1 and the bending section 3, and good assembly and buffering effects can be achieved.

[0046] As shown in FIGS. 2 to Figure 3 shown, in some embodiments, the bending section 3 is integrally formed with the lower circular tube 1 and the upper circular tube 2 respectively. Specifically, the bending section 3 includes a convex peak section 31 and a concave valley section 32 during the bending process, wherein the maximum distance h between the convex peak section 31 and the concave valley section 32 is 3 - 5 mm, preferably 4 mm. It should be emphasized that: the dimensions of the upper circular tube 2 are designed in combination with the dimensions of the lower circular tube 1 and the bending section 3, and good assembly and buffering effects can be achieved.

[0047] As shown in FIGS. 1 to Figure 6 shown, in some embodiments, the circular tube seat is a metal circular tube, preferably a steel tube. Further, the materials of the disc plate assembly are all Q235 steel, specifically, the materials of the rib plate insertion plate 4 and the multiple rib plates 5 are all Q235 steel, which can increase the buffering strength and achieve a good energy absorption effect.

[0048] As shown in FIGS. 1 to Figure 6 shown, in some embodiments, the bending section 3 is designed as an inclined surface structure, and the inclination of the bending section 3 is designed to be 4° to 13°. The flipping stroke of the entire bending section 3 during the energy absorption process will be 20 to 60 mm, and the overall energy absorption effect is good, fully meeting the compressive requirements of the coal mine roadway.

[0049] As shown in FIGS. 1 to Figure 6As shown, in some embodiments, the buffering energy absorption structure provided by the present application can be used for the bottom energy absorption of the coal mine tunnel support to achieve energy absorption. Furthermore, the buffering energy absorption structure is installed in a cylindrical sleeve under the hydraulic support 6, and is connected to the cylindrical sleeve under the hydraulic support 6 of the coal mine tunnel support through a round pipe seat. Specifically, a sleeve is fixedly connected to the bottom of the hydraulic support 6, and the sleeve is sleeved on the upper section of the circular tube 2, and the bottom edge of the sleeve abuts on the bending section 3, and the bending section 3 can provide stable support for the hydraulic support 6 to prevent the hydraulic support 6 from tilting. In some embodiments, the upper section of the circular tube 2 is a conical tube with a top contraction, and the taper is 5 degrees. The inner wall of the sleeve is sleeved with the outer wall of the upper section of the circular tube 2, and there is a 5cm sliding buffer distance between the bottom edge of the sleeve and the concave valley section 32 of the bending section 3. When the impact ground pressure acts, the buffer energy absorption structure first moves upward as a whole until the bottom edge of the sleeve tube slides into the valley section 32 of the bending section 3. Then, the bending section 3 of the metal lower section circular tube 1 and the upper section circular tube 2 will drive the lower section circular tube wall to move downward and flip. The impact energy is initially dissipated by the bending deformation of the lower section circular tube wall when it flips. When the bending section 3 partly contacts the rib plate plug plate 4, the circular tube wall and the rib plate plug plate 4 absorb the impact energy by means of collapse plastic buckling.

[0050] The buffering energy-absorbing structure provided in the present application has a simple and practical structural design, is convenient for the bottom support of the coal mine tunnel support, can play a good buffering and energy-absorbing role when pressure impacts the ground pressure, improves the energy absorption level, and greatly improves the safety of the tunnel support.

[0051] The embodiment of the present invention also provides an underground coal mine tunnel support method. Figure 8 For an underground coal mine tunnel support system formed according to an embodiment of the present invention, see Figure 8 The underground coal mine tunnel support method according to the embodiment of the present invention may include the following steps:

[0052] S11, laying out a first anti-collision bottom plate 81 and a second anti-collision bottom plate 82 on the bottom plate of an underground coal mine tunnel, and making the first end of the first anti-collision bottom plate 81 and the first end of the second anti-collision bottom plate 82 relatively connected, so that the second end of the first anti-collision bottom plate 81 is close to the first side wall of the tunnel, and the second end of the second anti-collision bottom plate 82 is close to the second side wall of the tunnel;

[0053] The second end of the first anti-collision bottom plate 81 has a first bearing seat 810, and the first bearing seat 810 has a first hinge position 8101 and a second hinge position 8102; the second end of the second anti-collision bottom plate 82 has a second bearing seat 820, and the second bearing seat 820 has a third hinge position 8201 and a fourth hinge position 8202;

[0054] S12. Hinge the first end of the first intermediate support 91 at the first hinge position 8101, hinge the lower circular tube of the circular tube seat of the first buffer energy-absorbing structure 101 at the second hinge position 8102, and sleeve the sleeve fixedly connected to the bottom end of the first hydraulic strut 1101 outside the upper circular tube of the circular tube seat of the first buffer energy-absorbing structure 101; hinge the first end of the first top plate support 1201 at the second end of the first intermediate support 91, and hinge the sub-hinge position of the first top plate support 1201 with the top end of the first hydraulic strut 1101;

[0055] S13. Hinge the first end of the second intermediate support 92 at the third hinge position 8201, hinge the lower circular tube of the circular tube seat of the second buffer energy-absorbing structure 102 at the fourth hinge position 8202, and sleeve the sleeve fixedly connected to the bottom end of the second hydraulic strut 1102 outside the upper circular tube of the circular tube seat of the second buffer energy-absorbing structure 102; hinge the first end of the second top plate support 1202 at the second end of the second intermediate support 92, and hinge the sub-hinge position of the second top plate support 1202 with the top end of the second hydraulic strut 1102;

[0056] S14. Set an intermediate hinge seat 130 on the upper surface of the butt joint seam at the first end of the first anti-collision floor 81 and the first end of the second anti-collision floor 82; fixedly connect the intermediate hinge seat 130 to the first end of the first anti-collision floor 81 and the first end of the second anti-collision floor 82 respectively; hinge the lower circular tube of the circular tube seat of the third buffer energy-absorbing structure 103 on the intermediate hinge seat 130; sleeve the sleeve fixedly connected to the bottom end of the third hydraulic strut 1103 outside the upper circular tube of the circular tube seat of the third buffer energy-absorbing structure 103; hinge the top end of the third hydraulic strut 1103 to the second end of the first top plate support 1201 and the second end of the second top plate support 1202 respectively through a hinge shaft;

[0057] S15. Adjust the elongation lengths of the first hydraulic strut 1101, the second hydraulic strut 1102 and the third hydraulic strut 1103 so that both the first top plate support 1201 and the second top plate support 1202 are in contact with the arched top of the roadway, and make the third hydraulic strut 1103 in a vertical state.

[0058] Wherein, the first buffer energy-absorbing structure 101, the second buffer energy-absorbing structure 102, and the third buffer energy-absorbing structure 103 are respectively the insert-type butterfly buffer energy-absorbing structures described in any one of the foregoing embodiments.

[0059] In this embodiment, the bottoms of the hydraulic supports are all supported on the insert-type butterfly buffer energy absorption structure, and the insert-type butterfly buffer energy absorption structure includes a circular tube seat and a disc plate assembly; the circular tube seat includes a lower circular tube and an upper circular tube; the upper circular tube is arranged at the upper end of the lower circular tube, and the axis of the upper circular tube and the axis of the lower circular tube are on the same straight line; the lower circular tube and the upper circular tube are connected by a bending section; the disc plate assembly is arranged inside the lower circular tube. When rock burst occurs, the bending section between the lower circular tube and the upper circular tube will drive the wall of the lower circular tube to move downward and turn, and the impact energy is initially dissipated by the bending deformation when the wall of the lower circular tube turns. When the bending section contacts the disc plate assembly, a multi-chamber thin-wall structure will be formed, and the impact energy is absorbed by the way of collapse plastic buckling to achieve the second-level energy absorption, which is beneficial to improving the energy absorption level and greatly improving the safety of roadway support.

[0060] Wherein, an intermediate hinge seat 130 is arranged on the upper surface of the butt joint seam at the first end of the first anti-burst floor 81 and the first end of the second anti-burst floor 82; the intermediate hinge seat 130 is fixedly connected to the first end of the first anti-burst floor 81 and the first end of the second anti-burst floor 82 respectively, so that the first anti-burst floor 81 and the second anti-burst floor 82 are connected into an integrated structure, which can improve the inhibitory effect of the integrated structure formed by the first anti-burst floor 81 and the second anti-burst floor 82 on rock burst. Further, the lower circular tube of the circular tube seat of the third buffer energy absorption structure 103 is hinged on the intermediate hinge seat 130, the sleeve fixedly connected to the bottom end of the third hydraulic support 1103 is sleeved outside the upper circular tube of the circular tube seat of the third buffer energy absorption structure 103, and the top end of the third hydraulic support 1103 is hinged to the second end of the first roof support and the second end of the second roof support 1202 respectively through a hinge shaft. When rock burst occurs, the third buffer energy absorption structure 103 can generate multi-stage plastic deformation to absorb the energy of rock burst.

[0061] In some embodiments, the first hinge position 8101 and the third hinge position 8201 are symmetrically arranged with respect to the butt joint seam of the first end of the first anti-collision floor 81 and the first end of the second anti-collision floor 82, and the second hinge position 8102 and the fourth hinge position 8202 are symmetrically arranged with respect to the butt joint seam of the first end of the first anti-collision floor 81 and the first end of the second anti-collision floor 82. That is to say, the first buffer energy absorption structure 101 and the second buffer energy absorption structure 102 are located on both sides of the third buffer energy absorption structure 103 and are symmetrically arranged with respect to the third buffer energy absorption structure 103, which is conducive to the balanced absorption of rock burst energy. The first intermediate support 91 and the second intermediate support 92 are arranged in an inverted eight-character symmetry with respect to the butt joint seam of the first end of the first anti-collision floor 81 and the first end of the second anti-collision floor 82, which is conducive to providing the stability of roadway support on the basis of the balanced absorption of rock burst energy.

[0062] As mentioned above, the above are only the preferred embodiments of the present invention and do not impose any formal restrictions on the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention or modify it into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the present invention. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention all fall within the protection scope of this technical solution.

Claims

1. A plug-in butterfly-shaped buffer energy absorption structure for coal mine tunnel support, characterized in that: The insert-type butterfly-shaped buffer energy absorption structure comprises a circular tube seat and a disc plate assembly; the circular tube seat comprises a lower circular tube (1) and an upper circular tube (2); the upper circular tube (2) is arranged at the upper end of the lower circular tube (1), and the axis of the upper circular tube (2) and the axis of the lower circular tube (1) are located on the same straight line; the lower circular tube (1) and the upper circular tube (2) are connected via a bending section (3); the disc plate assembly is arranged in the lower circular tube (1); The disc plate assembly is integrally movably arranged in the lower circular tube (1); the disc plate assembly comprises a rib plate insert (4) and a plurality of rib plates (5); a plurality of sockets are evenly arranged on the circumference of the rib plate insert (4); a notch is arranged at one end of the rib plate (5); each of the rib plates (5) is respectively plugged into one of the sockets through its notch; The rib plate insert (4) is a disc structure, and the rib plate insert (4) is arranged at the center of the lower circular tube (1) in the horizontal direction; the rib plate insert (4) is arranged concentrically with the lower circular tube (1); the rib plate (5) is clamped in the socket in the vertical direction; The bending section (3) is formed integrally with the lower circular tube (1) and the upper circular tube (2) respectively; the bending section (3) comprises a convex peak section (31) and a concave valley section (32); the maximum distance between the convex peak section (31) and the concave valley section (32) is 3 mm to 5 mm; the bending section (3) is designed as a slope structure, and the inclination of the bending section (3) is designed to be 4° to 13°; Wherein, the concave valley section is arc-shaped.

2. The buffer energy absorption structure according to claim 1, characterized in that: The rib plate (5) is a rectangular parallelepiped structure; the length of the rib plate (5) is in the range of 50-70 mm; the height of the rib plate (5) is in the range of 40-60 mm; the thickness of the rib plate (5) is in the range of 6-10 mm; the distance between the bottom surface of the notch and the bottom of the rib plate (5) is in the range of 20-30 mm; the vertical height of the notch is in the range of 4-6 mm; the horizontal depth of the notch is in the range of 15-25 mm; and the width of the notch is in the range of 2-4 mm.

3. The buffer energy absorption structure according to claim 1, characterized in that: The radius of the rib plate insert (4) is in the range of 50-70 mm, and the thickness of the rib plate insert (4) is in the range of 4-8 mm; the depth of the socket is in the range of 15-25 mm, and the width of the socket is in the range of 6-10 mm; and the distance between the end of the rib plate (5) away from the rib plate insert (4) and the inner wall of the lower circular tube (1) is 2-4 mm.

4. The buffer energy absorption structure according to claim 1, characterized in that: The radius of the lower circular tube (1) has a value range of 80-110 mm; the height of the lower circular tube (1) has a value range of 100-150 mm; and the wall thickness of the lower circular tube (1) has a value range of 7-11 mm.

5. The buffer energy absorption structure according to claim 1, characterized in that: The radius of the upper circular tube (2) is 3 mm to 5 mm smaller than the radius of the lower circular tube (1); the height of the upper circular tube (2) is in the range of 40-50 mm; the wall thickness of the upper circular tube (2) is in the range of 8-12 mm; and the wall thickness of the upper circular tube (2) is greater than the wall thickness of the lower circular tube (1).

6. A method for supporting underground coal mine tunnels, characterized in that: include: Arrange a first anti-collision bottom plate and a second anti-collision bottom plate opposite to each other on the bottom plate of the underground coal mine tunnel; An intermediate hinge seat is provided on the upper surface of the joint between the first end of the first impact-proof bottom plate and the first end of the second impact-proof bottom plate; the intermediate hinge seat is fixedly connected to the first end of the first impact-proof bottom plate and the first end of the second impact-proof bottom plate respectively; the lower section of the circular tube seat of the third buffer energy-absorbing structure is hinged on the intermediate hinge seat; the sleeve fixedly connected to the bottom end of the third hydraulic support is sleeved on the outer side of the upper section of the circular tube seat of the third buffer energy-absorbing structure; the top end of the third hydraulic support is hinged to the second end of the first top plate support and the second end of the second top plate support respectively through the hinge shaft; wherein, the first end of the first top plate support is hinged to the second end of the first impact-proof bottom plate through the first intermediate support, and the first end of the second top plate support is hinged to the second end of the second impact-proof bottom plate through the second intermediate support; Adjusting the extension length of the third hydraulic prop so that both the first roof support and the second roof support abut against the arched top of the tunnel and the third hydraulic prop is in a vertical state; Among them, the first buffer energy absorbing structure, the second buffer energy absorbing structure, and the third buffer energy absorbing structure are respectively the insert-type butterfly buffer energy absorbing structure described in any one of the aforementioned claims 1-5, the first buffer energy absorbing structure and the second buffer energy absorbing structure are located on both sides of the third buffer energy absorbing structure, and are arranged symmetrically relative to the third buffer energy absorbing structure. At the same time, the first intermediate bracket and the second intermediate bracket are symmetrically arranged in an inverted eight shape relative to the butt joint between the first end of the first anti-impact bottom plate and the first end of the second anti-impact bottom plate.

7. The underground coal mine tunnel support method according to claim 6, characterized in that: The second end of the first anti-collision bottom plate has a first bearing seat, and the first bearing seat has a first hinge position and a second hinge position; the second end of the second anti-collision bottom plate has a second bearing seat, and the second bearing seat has a third hinge position and a fourth hinge position; The first end of the first intermediate support is hinged at the first hinged position, the lower section of the circular tube of the circular tube seat of the first buffer energy absorbing structure is hinged at the second hinged position, and the sleeve fixedly connected to the bottom end of the first hydraulic support is sleeved on the outer side of the upper section of the circular tube of the circular tube seat of the first buffer energy absorbing structure; the first end of the first top plate support is hinged at the second end of the first intermediate support, and the sub-hinge position of the first top plate support is hinged to the top end of the first hydraulic support; The first end of the second intermediate bracket is hinged at the third hinge position, the lower section of the circular tube of the circular tube seat of the second buffer energy absorbing structure is hinged at the fourth hinge position, and the sleeve fixedly connected to the bottom end of the second hydraulic support is sleeved on the outer side of the upper section of the circular tube of the circular tube seat of the second buffer energy absorbing structure; the first end of the second top plate bracket is hinged at the second end of the second intermediate bracket, and the sub-hinge position of the second top plate bracket is hinged to the top end of the second hydraulic support.

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