Insertion piece type butterfly-shaped buffering energy absorption structure for coal mine tunnel support and coal mine tunnel support method

Abstract

The invention provides an inserting piece type butterfly-shaped buffering and energy-absorbing structure for supporting a coal mine tunnel and a coal mine tunnel supporting method, relates to the technical field of tunnel supporting, and aims to reduce the damage of rock burst. The inserting piece type buffering and energy absorbing structure of the coal mine tunnel support comprises a round pipe base and a dish plate assembly. The circular tube seat comprises 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 located on the same straight line; the lower-section circular tube and the upper-section circular tube are connected through a bent section; and the dish plate assembly is arranged in the lower-section circular tube. According to the underground coal mine roadway supporting method, the inserting piece type butterfly-shaped buffering energy-absorbing structure is adopted. The inserting piece type butterfly-shaped buffering and energy-absorbing structure for supporting the coal mine tunnel is suitable for supporting the underground coal mine tunnel.

Description

Technical Field

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

[0002] Due to the safety requirements of construction and use, existing coal mine tunnels need to design a support system to resist the surrounding rock pressure. The commonly used support materials and equipment in coal mine tunnels are mainly anchor rods (ropes), shed-type supports and hydraulic supports, and the anti-impact support designs to cope with impact ground pressure are mostly expanded and combined based on these support forms. They mostly start from improving the stiffness of the support structure and other aspects, which cannot meet the safety needs of coal mine tunnels. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies and to propose a plug-in butterfly-shaped buffer energy absorption structure for coal mine tunnel support and a coal mine tunnel support method, so as to improve the stability and reliability of coal mine tunnel support.

[0004] In the first aspect, the present invention provides a plug-in butterfly-shaped buffer energy absorption structure for coal mine tunnel support, the 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 located 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 in the lower circular tube.

[0005] In some embodiments, the disc plate assembly is integrally movably arranged in the lower section of the circular tube; the disc plate assembly includes a rib plate insert and multiple rib plates; multiple sockets are evenly arranged on the circumference of the rib plate insert; a notch is arranged at one end of the rib; each rib plate is respectively connected to a socket through its notch.

[0006] In some embodiments, the rib plate insert is a disc structure, and the rib plate insert is horizontally arranged at the center of the lower circular tube; the rib plate insert is concentrically arranged with the lower circular tube; and the rib plate is clamped in the socket along the vertical direction.

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

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

[0009] In some embodiments, the radius of the lower tube is The value range of is 80-110 mm; the value range of the height h3 of the lower section of the circular tube is 100-150 mm; the value range of the wall thickness B3 of the lower section of the circular tube is 7-11 mm.

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

[0011] In some embodiments, the bending section is integrally formed with the lower circular tube and the upper circular tube 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 round tube seat is a metal round tube, and the material of the disc plate assembly is Q235 steel.

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

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

[0015] In a second aspect, the present invention provides an underground coal mine tunnel support method, comprising: 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 anti-impact bottom plate and the first end of the second anti-impact bottom plate; the intermediate hinge seat is fixedly connected to the first end of the first anti-impact bottom plate and the first end of the second anti-impact 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 anti-impact bottom plate through the first intermediate support, and the second end of the second top plate support is hinged to the second end of the second anti-impact bottom plate through the second intermediate support; The extension length of the third hydraulic prop is adjusted so that the first roof support and the second roof support are both in contact with the arched top of the tunnel, and the third hydraulic prop is in a vertical state.

[0016] Optionally, the second end of the first anti-collision bottom plate has a first bearing seat, 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, 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.

[0017] The present application provides a plug-in butterfly buffer energy absorption structure for coal mine tunnel support and an underground coal mine tunnel support method, wherein the plug-in 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 is located on the same straight line as the axis of the lower circular tube; the lower circular tube and the upper circular tube are connected by a bending section; the disc plate assembly is arranged in the lower circular tube. The buffer energy absorption structure provided by the present invention can cause the wall of the lower circular tube to be driven downward and flipped at the bending section between the lower circular tube and the upper circular tube when the impact ground pressure acts, and the impact energy is initially dissipated by the bending deformation of the wall of the lower circular tube when it flips. When the bending section contacts the disc plate assembly, a multi-cavity thin-walled structure is formed, which absorbs the impact energy by means of collapse plastic buckling, thereby realizing the second-level energy absorption. Therefore, the buffer energy-absorbing structure designed in the present invention can absorb impact energy under any working conditions, improve the energy absorption level, and greatly improve the safety of tunnel support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 The figure is a three-dimensional diagram of a buffer energy absorption structure of the present invention.

[0020] Figure 2 This is a front view of a buffer energy absorption structure of the present invention.

[0021] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of part B.

[0022] Figure 4 The figure is a cross-sectional view of a buffer energy absorption structure of the present invention.

[0023] Figure 5 The figure is a top view of a buffer energy absorption structure of the present invention.

[0024] Figure 6 The present invention is a schematic diagram of a buffer energy absorption structure in use.

[0025] Figure 7 This is a schematic diagram of a rib plate structure of the present invention; Figure 8 An underground coal mine tunnel support system is formed according to an embodiment of the present invention.

[0026] In the figure: 1, lower section of circular tube; 2, upper section of circular tube; 3, bending section; 31, convex peak section; 32, concave valley section; 4, rib plate plug; 5, rib plate; 6, hydraulic support. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0028] 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.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] As shown in Figure 1 to Figure 6As shown, the present invention provides a plug-in butterfly buffer energy absorption structure for coal mine tunnel support, which is applied to the buffer support of coal mine tunnel support to realize the energy absorption of tunnel floor impact ground pressure. Specifically, the plug-in butterfly buffer energy absorption structure includes a circular tube seat and a disc plate assembly; wherein 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 is located on the same straight line as the axis of the lower circular tube 1, 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 flange structure formed between the lower circular tube 1 and the upper circular tube 2, which can play a buffering role during energy impact and realize energy absorption. Further, the upper circular tube 2 is used to connect with the hydraulic support 6 of the coal mine tunnel support. Furthermore, the disc plate assembly is arranged in the lower circular tube 1, so that when the hydraulic support 6 is subjected to energy impact, the energy impact acts on the disc plate assembly through the bending section 3, thereby realizing the first level of energy absorption. The buffer energy absorption structure provided by the present invention can cause the wall of the lower circular tube to be driven to move downward and flip over at the bending section between the lower circular tube and the upper circular tube when the impact ground pressure acts, and the impact energy is initially dissipated by the bending deformation when the wall of the lower circular tube flips over. When the bending section contacts the disc plate assembly, a multi-cavity thin-wall structure is formed, which absorbs the impact energy by means of collapse plastic buckling, thereby realizing the second level of energy absorption. Therefore, the buffer energy absorption structure designed by the present invention can realize the absorption of impact energy under any working conditions, improve the energy absorption level, and greatly improve the safety of tunnel support.

[0033] As shown in Figure 1 to Figure 7 As shown, in some embodiments, the disc plate assembly is integrally movably arranged in the lower section of the circular tube 1, so as to better realize the absorption of impact energy by the crushing plastic buckling mode. Furthermore, 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; wherein, a plurality of sockets are evenly arranged on the circumference of the rib plate insert 4; and a notch 51 is arranged at one end of the rib plate 5. Specifically, each rib plate 5 is respectively plugged into a socket through its notch 51, so as to form an integral structure with the rib plate insert 4. In the above structure, the socket designed for the rib plate insert 4 and the notch 51 designed for the rib plate 5 only need to align the notch and the socket and insert them during installation, so the installation is relatively convenient.

[0034] As shown in Figure 1 to Figure 6As shown, in some embodiments, the rib plate insert 4 is a disc structure, so that the rib plate 5 can be reasonably and maximally installed. Considering the actual research, the rib plate 5 is preferably designed to be 7 to 8, so that the buffering energy absorption can be achieved to the greatest extent. Further, the rib plate insert 4 is arranged at the center position of the lower section of the circular tube 1 in the horizontal direction, and the rib plate insert 4 is arranged concentrically with the lower section of the circular tube 1 to achieve the best buffering state. Further, the rib plate 5 is clamped in the socket in the vertical direction, so that each rib plate 5 is perpendicular to the rib plate insert 4, forming a collapse plastic buckling buffer structure.

[0035] like Figure 7 As shown, in some embodiments, the rib 5 is a rectangular parallelepiped structure. Specifically, the length L1 of the rib 5 ranges from 50-70mm, preferably 60mm. The height h1 of the rib 5 ranges from 40-60mm, preferably 50mm. The thickness B1 of the rib 5 ranges from 6-10mm, preferably 7 or 8mm. The distance h5 between the bottom surface of the notch 51 of the rib 5 and the bottom of the rib 5 ranges from 20-30mm, preferably 25mm. The vertical height h6 of the notch 51 ranges from 4-6mm, preferably 5mm. The horizontal depth L6 of the notch 51 ranges from 15-25mm, preferably 20mm. The width B2 of the notch 51 ranges from 2-4mm, preferably 3mm. It should be emphasized that the above dimensions of the rib 5 and its notch 51 are designed based on actual research and can achieve a better collapse effect in practical applications.

[0036] As shown in Figure 1 to Figure 6 As shown, in some embodiments, the rib plate insert 4 is a disc structure, and the radius of the rib plate insert 4 The value range is 50-70mm, preferably 60mm. The thickness h2 of the rib plate 4 is in the range of 4-8mm, preferably 6mm; the depth L2 of the socket is in the range of 15-25mm, preferably 20mm. The width B2 of the socket is in the range of 6-10mm, preferably 8mm. The distance R between the end of the rib plate 5 away from the rib plate 4 and the inner wall of the lower section of the circular tube 1 is 2-4mm, preferably 3mm. It should be emphasized that the above dimensions of the rib plate 4 are designed based on actual research, and combined with the dimensions of the rib plate 5 and its notch 51, a better collapse effect can be achieved in actual applications.

[0037] As shown in Figure 1 to Figure 6 As shown, in some embodiments, the radius of the lower tube 1 is The value range of is 80-110mm, preferably 90mm. The value range of the height h3 of the lower section round tube 1 is 100-150mm, preferably 140mm. The value range of the tube wall thickness B3 of the lower section round tube 1 is 7-11mm, preferably 9mm. It should be emphasized that the size of the lower section round tube 1 is designed in combination with the size of the rib plate insert 4, the size of the rib plate 5 and its notch 51, which can achieve better assembly effect and buffer effect.

[0038] As shown in Figure 1 to Figure 6 As shown, in some embodiments, the radius R of the upper tube 2 is 3 mm to 5 mm smaller than the radius of the lower tube 1, preferably 4 mm. Figure 3 As shown, H has a value range of 1.5-2.5mm, preferably 2mm. The height h4 of the upper circular tube 2 has a value range of 40-50mm, preferably 45mm. The wall thickness B4 of the upper circular tube 2 has a value range of 8-12mm, preferably 10mm. 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 size of the upper circular tube 2 is designed in combination with the size of the lower circular tube 1 and the bending section 3, which can achieve better assembly effect and buffering effect.

[0039] As shown in Figure 2 to Figure 3 As shown, in some embodiments, the bending section 3 is integrally formed with the lower section circular tube 1 and the upper section circular tube 2. 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 mm to 5 mm, preferably 4 mm. It should be emphasized that the size of the upper section circular tube 2 is designed in combination with the size of the lower section circular tube 1 and the bending section 3, which can achieve a better assembly effect and buffering effect.

[0040] As shown in Figure 1 to Figure 6 As shown, in some embodiments, the round tube seat is a metal round tube, preferably a steel tube. Further, the material of the disc plate assembly is Q235 steel, specifically the material of the rib plate insert 4 and the plurality of rib plates 5 is Q235 steel, which can increase the buffer strength and achieve a better energy absorption effect.

[0041] As shown in Figure 1 to Figure 6 As shown, in some embodiments, 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°. The flipping stroke of the entire bending section 3 during the energy absorption process will be 20 to 60 mm. The overall energy absorption effect is good, and it fully meets the compression resistance requirements of coal mine tunnels.

[0042] As shown in Figure 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.

[0043] 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.

[0044] 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: 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; 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; S12, hinge the first end of the first intermediate support 91 at the first hinge position 8101, hinge the lower section of the 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 support 1101 on the outer side of the upper section of the 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 to the top end of the first hydraulic support 1101; S13, hinge the first end of the second intermediate support 92 to the third hinge position 8201, hinge the lower section of the circular tube of the circular tube seat of the second buffer energy absorbing structure 102 to the fourth hinge position 8202, and sleeve the sleeve fixedly connected to the bottom end of the second hydraulic support 1102 on the outer side of the upper section of the 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 to the second end of the second intermediate support 92, and hinge the sub-hinge position of the second top plate support 1202 to the top end of the second hydraulic support 1102; S14, an intermediate hinge seat 130 is provided on the upper surface of the joint between the first end of the first impact-proof bottom plate 81 and the first end of the second impact-proof bottom plate 82; the intermediate hinge seat 130 is fixedly connected to the first end of the first impact-proof bottom plate 81 and the first end of the second impact-proof bottom plate 82 respectively; the lower section of the circular tube of the circular tube seat of the third buffer energy-absorbing 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 on the outer side of the upper section of the circular tube seat of the third buffer energy-absorbing structure 103; the top end of the third hydraulic support 1103 is hinged to the second end of the first top plate support 1201 and the second end of the second top plate support 1202 respectively through the hinge shaft; S15. Adjust the extension lengths of the first hydraulic prop 1101, the second hydraulic prop 1102 and the third hydraulic prop 1103 so that the first roof support 1201 and the second roof support 1202 are both in contact with the arched top of the tunnel, and the third hydraulic prop 1103 is in a vertical state.

[0045] The first buffering energy absorbing structure 101, the second buffering energy absorbing structure 102, and the third buffering energy absorbing structure 103 are respectively the insert-type butterfly buffering energy absorbing structures described in any of the aforementioned embodiments.

[0046] In this embodiment, the bottom of each hydraulic support is supported on a plug-in butterfly-shaped buffer energy absorption structure, which 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 is located on the same straight line as the axis of the lower circular tube; the lower circular tube and the upper circular tube are connected by a bending section; the disc plate assembly is arranged in the lower circular tube. When the impact ground pressure acts, the bending section between the lower circular tube and the upper circular tube will cause the wall of the lower circular tube to be driven to move downward and flip, 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-cavity thin-walled structure will be formed, which absorbs the impact energy by means of collapse plastic buckling, and realizes the second-level energy absorption, which is conducive to improving the energy absorption level and greatly improving the safety of the tunnel support.

[0047] Among them, an intermediate hinge seat 130 is set on the upper surface of the joint between the first end of the first impact-proof bottom plate 81 and the first end of the second impact-proof bottom plate 82; the intermediate hinge seat 130 is fixedly connected to the first end of the first impact-proof bottom plate 81 and the first end of the second impact-proof bottom plate 82 respectively, so that the first impact-proof bottom plate 81 and the second impact-proof bottom plate 82 are connected to form an integrated structure, which can improve the inhibitory effect of the integrated structure formed by the first impact-proof bottom plate 81 and the second impact-proof bottom plate 82 on impact ground pressure. Furthermore, the lower section of the circular tube of the circular tube seat of the third buffer energy absorbing structure 103 is hinged on the middle hinge seat 130, the sleeve fixedly connected to the bottom end of the third hydraulic support 1103 is sleeved on the outer side of the upper section of the circular tube of the circular tube seat of the third buffer energy absorbing structure 103, and the top end of the third hydraulic support 1103 is hinged to the second end of the first top plate support and the second end of the second top plate support 1202 through a hinge axis respectively. When impact ground pressure acts, the third buffer energy absorbing structure 103 can produce multi-stage plastic deformation to absorb the impact ground pressure energy.

[0048] In some embodiments, the first hinge position 8101 and the third hinge position 8201 are symmetrically arranged relative to the joint between the first end of the first anti-impact bottom plate 81 and the first end of the second anti-impact bottom plate 82, and the second hinge position 8102 and the fourth hinge position 8202 are symmetrically arranged relative to the joint between the first end of the first anti-impact bottom plate 81 and the first end of the second anti-impact bottom plate 82, that is, 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 relative to the third buffer energy absorption structure 103, which is conducive to the balanced absorption of impact ground pressure energy. The first intermediate bracket 91 and the second intermediate bracket 92 are symmetrically arranged in an inverted eight shape relative to the joint between the first end of the first anti-impact bottom plate 81 and the first end of the second anti-impact bottom plate 82, which is conducive to providing stability of the tunnel support on the basis of balanced absorption of impact ground pressure energy.

[0049] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above-mentioned technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. 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 belong to the protection scope of the present 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); and the disc plate assembly is arranged in the lower circular tube (1).

2. The buffer energy absorption structure according to claim 1, characterized in that: 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 in the circumferential direction of the rib plate insert (4); a notch is arranged at one end of the rib plate (5); and each of the rib plates (5) is plugged into one of the sockets via its notch.

3. The buffer energy absorption structure according to claim 2, characterized in that: 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); and the rib plate (5) is clamped in the socket in the vertical direction.

4. The buffer energy absorption structure according to claim 2, 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.

5. The buffer energy absorption structure according to claim 2, 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.

6. 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.

7. 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).

8. The buffer energy absorption structure according to claim 1, characterized in that: 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.

9. 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 anti-impact bottom plate and the first end of the second anti-impact bottom plate; the intermediate hinge seat is fixedly connected to the first end of the first anti-impact bottom plate and the first end of the second anti-impact 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 anti-impact bottom plate through the first intermediate support, and the second end of the second top plate support is hinged to the second end of the second anti-impact 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; Wherein, the third buffering and energy absorbing structure is the insert-type butterfly buffering and energy absorbing structure as described in any one of the preceding claims 1-8.

10. The underground coal mine tunnel support method according to claim 9, 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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