Floor heaving prevention device for coal mine tunnel

Abstract

The invention belongs to the technical field of coal mine tunnel supporting, and discloses a coal mine tunnel floor heave prevention device which comprises a plurality of layers of bottom plates arranged on the bottom face of a tunnel and a force transmission structure fixedly arranged in a gap layer. The force transmission structure comprises an adjusting rod, an oil cylinder and a piston rod; the other end of the hydraulic cylinder is in sliding connection with the oil cylinder; a plurality of outlets are symmetrically formed in the two sides of the oil cylinder, and the upper end of the oil cylinder is fixedly connected with a guide pipe penetrating through the interior of the oil cylinder; the multiple adjusting rods are arranged in the corresponding outlets in a sliding mode, and the piston rod is arranged at the upper end of the guide pipe in a sliding mode; and the plurality of joint filling assemblies are arranged in the lower-layer bottom plate in a penetrating manner. The direction of upward jacking force generated when the piston rods act on the multiple layers of bottom plates fixed above the piston rods is collinear and opposite to the direction of gliding component force generated by the bottom plates above along the inclined roadway due to gravity, the gliding component force can be offset or reduced, the dynamic balance capacity of the supporting system under the surrounding rock pressure is improved, and the adaptability to roadway deformation is enhanced.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of coal mine roadway support, and particularly relates to a coal mine roadway anti-floor heave device. BACKGROUND

[0002] In many underground operation fields such as mine exploitation and underground engineering construction, the support problem of inclined roadway has long been one of the major challenges faced by engineering and technical personnel, especially under the complex geological conditions of soft rock stratum at the bottom of the roadway, the support difficulty is exponentially increased.

[0003] The soft rock stratum itself has low strength and poor stability. In the inclined roadway environment, the rock mass gravity inevitably produces a significant sliding force along the direction of the roadway floor. This sliding force has a very adverse effect on the overall stability of the roadway. The widely used anti-floor heave support device is usually composed of multiple support units. However, in the actual application process, it is found that when the middle support device is extruded by the adjacent two side support devices, the stress will be highly concentrated at the connection, forming a weak stress point.

[0004] As far as the prior art is concerned, although the anti-floor heave structure of the double-layer anti-inverted arch at the bottom of the roadway and the construction method thereof as shown in the patent with publication number CN115467675B can disperse the pressure in the middle of the support device to some extent, the dispersion way mainly relies on the symmetrically arranged structure units to transfer the pressure to both ends. However, when the roadway is in an inclined state, the sliding force along the slope direction caused by the rock mass gravity will break this symmetrical force balance, making the originally symmetrical structure unit unbalanced, and the floor heave phenomenon no longer occurs uniformly in the middle, but is biased to the lower side, resulting in a deviation between the design position of the floor heave and the structure unit, greatly weakening the support effect.

[0005] Furthermore, when there is a soft rock stratum at the bottom of the roadway, the sliding force at the bottom of the inclined roadway floor will cause the sliding of the soft rock stratum. This sliding has a serious destructive effect on the internal structure of the rock stratum, making the soft rock stratum more loose and weak, and its bearing capacity also decreases significantly, thus more easily causing the deformation of the floor heave. The upward deformation of the soft layer will weaken the support of the upper rock layer, causing the upper rock layer to sink due to insufficient support. In the specific case where the sliding surface inclination is less than the inclination of the roadway, this sinking phenomenon will further increase the pressure and sliding force acting on the potential sliding surface, thus forming a vicious cycle, making the sliding phenomenon more likely to occur and intensify, seriously threatening the overall stability of the roadway and the operation safety. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present disclosure is to provide a coal mine tunnel anti-floor heaving device, which solves the problems of position deviation of the supporting device caused by the sliding force of the inclined tunnel, easy sliding instability of the weak rock stratum, and force imbalance of the traditional structural unit.

[0007] The purpose of the present disclosure can be achieved by the following technical solutions:

[0008] The coal mine tunnel anti-floor heaving device comprises a multilayer floor arranged on the tunnel floor, wherein the multilayer floor comprises a lower layer floor, an upper layer floor and a support frame; the lower layer floor is located above the tunnel floor, and the upper layer floor is arranged directly above the lower layer floor; the support frame is slidably arranged between the upper layer floor and the lower layer floor and forms a gap layer between the upper layer floor and the lower layer floor;

[0009] A force transmission structure is fixedly arranged in the gap layer; the force transmission structure comprises an adjusting rod, an oil cylinder and a piston rod; one end of the adjusting rod is used for fixedly connecting the tunnel side wall, and the other end thereof is slidably connected with the oil cylinder; a plurality of outlets are symmetrically formed on both sides of the oil cylinder, and a guide pipe penetrating the inside of the oil cylinder is fixedly connected to the upper end of the oil cylinder; a plurality of adjusting rods are slidably arranged in the corresponding outlets, and the piston rod is slidably arranged at the upper end of the guide pipe;

[0010] A plurality of joint filling assemblies are arranged in the lower layer floor;

[0011] A trigger member is arranged between the oil cylinder and the joint filling assembly and penetrates the lower end surface of the oil cylinder; when the adjusting rod slides along the bottom surface of the oil cylinder, the trigger member is pressed, and the trigger member triggers the joint filling assembly.

[0012] In some disclosures, the joint filling assembly comprises a sealing cylinder, a flexible layer and a joint filling agent, and the inside of the lower layer floor is fixedly provided with the sealing cylinder, the upper and lower ends of the sealing cylinder are fixedly connected with the flexible layer, and the inside of the sealing cylinder is filled with the joint filling agent.

[0013] In some disclosures, the trigger member comprises a needle, a puncture part and a connecting plate, the inside of the sealing cylinder is provided with the needle penetrating the upper flexible layer, the bottom of the needle is provided with the sharp puncture part, the upper end of the needle is arranged to penetrate the oil cylinder, and the upper end of the needle is rotatably connected with a plurality of connecting plates.

[0014] In some disclosures, the material of the joint filling agent is epoxy resin adhesive or mine rock stratum reinforcing agent.

[0015] In some of the disclosure, the oil cylinder is provided with a through hole corresponding to the lancet needle, the adjusting rod is inserted into the oil cylinder, one end of the adjusting rod is fixed with a piston, a rectangular groove is formed at one end of the through hole close to the inner side of the oil cylinder, a rubber layer is arranged around the upper edge of the rectangular groove, and the width of the rectangular groove is matched with the width of the connecting plate.

[0016] In some of the disclosure, the outer side of the puncture part is coaxially fixed with a push ring, and the side wall of the push ring is matched with the inner wall of the sealing cylinder.

[0017] In some of the disclosure, the upper layer bottom plate and the lower layer bottom plate are both fixed with support seats at both ends, the inner side of the upper layer bottom plate and the inner side of the lower layer bottom plate are both provided with a plurality of straight grooves, and the support seats are provided with bolts penetrating the straight grooves.

[0018] In some of the disclosure, the support frame is located between the support seat of the upper layer bottom plate and the support seat of the lower layer bottom plate, the inner side of the support frame is provided with a plurality of limiting holes, and the upper end and the lower end of the support frame are respectively fixedly connected with the support frame on the upper layer bottom plate and the support frame on the lower layer bottom plate.

[0019] In some of the disclosure, the adjusting rod is fixed with a side plate at the end away from the oil cylinder, and a plurality of supporting springs are arranged between the adjusting rod and the support frame.

[0020] In some of the disclosure, a plurality of horizontal plates are detachably connected above the upper layer bottom plate, and the two ends of the horizontal plates are respectively connected with the support seats of the upper layer bottom plates arranged symmetrically.

[0021] The nouns, conjunctions or adjective parts involved in the above technical solutions are explained as follows:

[0022] Fixed connection refers to the connection of parts or components after being fixed, without any relative movement;

[0023] Rotary connection refers to the connection between parts that allows the parts to rotate relative to each other;

[0024] Threaded connection is a kind of detachable fixed connection, which has the advantages of simple structure, reliable connection, convenient assembly and disassembly, and is widely used in mechanical engineering and connection structure field;

[0025] Sliding connection refers to the connection between parts that allows the parts to slide relative to each other.

[0026] The beneficial effects of the disclosure are as follows:

[0027] 1、When the side of the inclined roadway deforms and extrudes the lower floor, the adjusting rods arranged symmetrically slide towards each other, the hydraulic oil in the oil cylinder flows to the end of the guide pipe, and the piston rod is pushed to move upwards. The upward lifting force generated by the piston rod acting on the fixed multi-layer floor above is in the opposite direction of the downward sliding component direction of the upper floor along the inclined roadway due to gravity, which helps to offset or reduce the downward sliding component, improve the dynamic balance ability of the support system under the surrounding rock pressure, and enhance the adaptability to the deformation of the roadway.

[0028] 2、By adjusting the rod to slide along the bottom surface of the oil cylinder to a specific position to compress the trigger piece linkage to trigger the caulking assembly, the release of the caulking agent is realized when the side pressure increases and the stability of the base decreases. Fill the gap between the lower floor and the roadway floor immediately, improve the compactness of the contact surface and the uniformity of the load bearing, and delay the risk of base instability. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0030] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present disclosure;

[0031] Figure 2 is a schematic diagram of the overall structure of the embodiment of the present disclosure hiding the upper floor and the oil cylinder;

[0032] Figure 3 is a schematic diagram of the overall structure of the force transmission structure and the caulking assembly of the embodiment of the present disclosure;

[0033] Figure 4 is a schematic diagram of the enlarged structure of the caulking assembly of the embodiment of the present disclosure;

[0034] Figure 5 is a schematic diagram of the internal structure of the oil cylinder of the embodiment of the present disclosure;

[0035] Figure 6 is a schematic diagram of the connection structure of the oil cylinder and the caulking assembly of the embodiment of the present disclosure;

[0036] Figure 7 is a schematic diagram of the overall structure in the roadway of the embodiment of the present disclosure.

[0037] In the figure: 1, multi-layer floor; 11, upper floor; 12, lower floor; 13, support frame; 111, straight slot; 131, limiting hole;

[0038] 2, force transmission structure; 21, adjusting rod; 22, oil cylinder; 23, piston rod; 24, guide tube; 211, piston; 212, side plate; 213, supporting spring; 221, rubber layer; 222, rectangular groove;

[0039] 3, caulking assembly; 31, sealing tube; 32, flexible layer; 33, caulking agent;

[0040] 4, trigger; 41, lancet; 42, puncture part; 43, connecting plate; 411, push ring; 5, support seat; 6, bolt; 7, cross plate. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0042] Please refer to Figures 1 to 7 , coal mine tunnel anti-floor drum device, multilayer floor 1, arranged on the tunnel floor, multilayer floor 1 includes lower floor 12, upper floor 11 and support frame 13; the lower floor 12 is located above the tunnel floor, the upper floor 11 is arranged directly above the lower floor 12; the support frame 13 is slidably arranged between the upper floor 11 and the lower floor 12, and forms a gap layer between the upper floor 11 and the lower floor 12;

[0043] Force transmission structure 2 is fixedly arranged in the gap layer; the force transmission structure 2 includes adjusting rod 21, oil cylinder 22 and piston rod 23; one end of the adjusting rod 21 is used for fixedly connecting the tunnel side wall, and the other end is slidably connected with the oil cylinder 22; a plurality of outlets are symmetrically arranged on both sides of the oil cylinder 22, and the upper end of the oil cylinder 22 is fixedly connected with a guide tube 24 penetrating through the inside of the oil cylinder 22; a plurality of adjusting rods 21 are slidably arranged in the corresponding outlets respectively, and the piston rod 23 is slidably arranged at the upper end of the guide tube 24;

[0044] A plurality of caulking assemblies 3 are arranged through the lower floor 12;

[0045] The trigger 4 is arranged between the oil cylinder 22 and the caulking assembly 3, and penetrates the lower end surface of the oil cylinder 22; the adjusting rod 21 is pressed when sliding along the bottom surface of the oil cylinder 22, and the trigger 4 triggers the caulking assembly 3.

[0046] In use, the lower floor 12 is pre-cast with concrete, and a plurality of accommodating holes for accommodating the caulking assembly 3 are formed in the concrete, and the force transmission assembly is arranged above the lower floor 12. When the two sides of the mine tunnel exert a centripetal horizontal pushing force on the lower floor 12, the two symmetrically distributed adjusting rods 21 are driven to slide towards each other, thereby driving the hydraulic oil in the oil cylinder 22 to move to the end of the guide pipe 24, and thereby exerting an upward driving force on the piston rod 23. The upper end of the piston rod 23 is fixedly connected to the multi-layer floor 1 above the lower floor 1 in the inclined tunnel, and exerts an upward pushing force on the upper multi-layer floor 1. In addition to the vertical downward force, the upper multi-layer floor 1 also has a downward component force parallel to the inclined tunnel. When the tunnel sides are deformed and pressed against the lower floor 12, the system can automatically convert the horizontal pressure of the sides into a vertical jacking force on the upper multi-layer floor 1 in real time. Thus, the downward component force of the upper multi-layer floor 1 along the inclined tunnel direction is effectively offset. This dynamic balance mechanism greatly improves the adaptability of the support system to the deformation pressure of the tunnel and the overall stability.

[0047] When the symmetrically adjusting rods 21 slide towards each other, it means that the support force of the multi-layer floor 1 on the two sides is insufficient. At this time, the end of the adjusting rod 21 away from the two sides is pressed against the trigger 4 during sliding along the bottom surface of the oil cylinder 22, thereby triggering the caulking agent 33 in the caulking assembly 3 to flow downward to fill the gap between the lower floor 12 and the tunnel floor, which is beneficial to further improve the stability of the connection between the lower floor 12 and the tunnel floor.

[0048] Through the above-mentioned pure mechanical linkage structure, the caulking operation can be started immediately when the side pressure that may cause instability of the foundation is sensed or after the side pressure is sensed. The downward injection of the caulking agent 33 into the possible gap helps to fill the gap at the initial stage of the problem, improves the contact state between the lower floor 12 and the tunnel floor, and improves the compactness and load uniformity of the contact surface, thereby possibly delaying or mitigating the structural instability caused by insufficient support of the foundation;

[0049] At the same time, the caulking operation only occurs when the displacement of the adjusting rod 21 reaches the degree of pressing the trigger 4, which usually corresponds to a working condition where the side pressure significantly increases and may affect the stability of the foundation. This "on-demand triggering" mechanism helps to avoid unnecessary material consumption and ensures that the caulking resources are concentratedly applied at the time and position that most need reinforcement, which may reduce the frequency and cost of subsequent active maintenance.

[0050] Please refer to Figures 4 to 6The gap filling assembly 3 comprises a sealing cylinder 31, a flexible layer 32 and a gap filling agent 33, the inner side of the lower layer base plate 12 is fixedly provided with the sealing cylinder 31, the upper and lower ends of the sealing cylinder 31 are fixedly connected with the flexible layer 32, and the inner side of the sealing cylinder 31 is filled with the gap filling agent 33.

[0051] In use, the gap filling agent 33 is stored in the sealing cylinder 31, the flexible layer 32 fixedly connected with the upper and lower ends of the sealing cylinder 31 is used to form a sealed space in the sealing cylinder 31, and since the lower end of the sealing cylinder 31 is made of flexible material and has good deformation capacity, when the roadway ground below the lower layer base plate 12 is flat, there are stones protruding upward, rigid contact between the stones and the sealing cylinder 31 is avoided, and leakage of the gap filling agent 33 in the sealing cylinder 31 during installation is avoided, and the flexible layer 32 can avoid the stones by deforming itself, which is beneficial to improve the adaptability of the gap filling agent 33 to the complex road surface.

[0052] The sealing cylinder 31 is made of a composite of plastic, paper, aluminum foil and the like, which combines the advantages of different materials. For example, the packaging of plastic and aluminum foil composite has both flexibility and sealing of plastic and barrier property of aluminum foil, which can better protect the performance of the gap filling agent 33. Such composite materials are often used for packaging of large-capacity or long-term storage gap filling agents 33.

[0053] Please refer to Figures 4 to 6 The trigger 4 comprises a needle 41, a puncture part 42 and a connecting plate 43, the inner side of the sealing cylinder 31 is provided with the needle 41 penetrating the upper flexible layer 32, the bottom of the needle 41 is provided with the sharp puncture part 42, the upper end of the needle 41 is provided through the oil cylinder 22, and the upper end of the needle 41 is rotatably connected with the connecting plate 43.

[0054] In use, the needle 41 coincides with the central axis of the sealing cylinder 31, and the needle 41 is vertically arranged with the flexible layer 32 below, when the needle 41 is triggered to move downward during the sliding of the adjusting rod 21, the puncture part 42 at the lower end of the needle 41 penetrates the lower flexible layer 32, and then the gap filling agent 33 in the sealing cylinder 31 accurately flows out, and since the sealing cylinder 31 is provided through the lower layer base plate 12, the gap filling agent 33 flowing out from the lower end of the sealing cylinder 31 accurately supplements between the lower layer base plate 12 and the roadway bottom surface, and the gap filling agent 33 penetrates into the rock layer fissure like "quick-drying glue", and quickly hardens into a network structure.

[0055] The material of the gap filling agent 33 is epoxy resin adhesive or mine rock layer reinforcing agent, after the gap filling agent 33 is injected into the stratum, it can rapidly penetrate into the fine cracks, expand and solidify, and utilize its excellent connection and adhesion properties with the rock.

[0056] Please refer to Figures 3 to 6The oil cylinder 22 is provided with a through hole corresponding to the needle 41, the adjusting rod 21 is inserted into one end of the oil cylinder 22 and is fixed with a piston 211, a rectangular groove 222 is formed at one end of the through hole close to the inner side of the oil cylinder 22, a rubber layer 221 is sealingly arranged around the upper edge of the rectangular groove 222, and the width of the rectangular groove 222 is matched with the width of the connecting plate 43, and the bottom end of the connecting plate 43 is in sliding connection with the inner wall of the rectangular groove 222.

[0057] When the adjusting rod 21 is inserted into the oil cylinder 22 away from one side of the two sides of the roadway, the adjusting rod 21 is inserted into one end of the oil cylinder 22 and is fixed with a piston 211, the piston 211 is in oil-tight connection with the oil cylinder 22 when sliding along the inner wall of the oil cylinder 22, the outer wall of the piston 211 is in close contact with the inner wall of the oil cylinder 22, the connecting rod is pressed to rotate downward when the piston 211 moves to the rectangular groove 222, thereby pushing the needle 41 to move downward and piercing the caulking assembly 3, and the through hole on the oil cylinder 22 is separated from the inner side of the oil cylinder 22 by the rubber layer 221 to prevent the hydraulic oil in the oil cylinder 22 from leaking.

[0058] Please refer to Figures 4 to 6 , the outer side of the puncture part 42 is coaxially fixed with a push ring 411, and the side wall of the push ring 411 is in close contact with the inner wall of the sealing cylinder 31.

[0059] When the needle 41 moves downward, the push ring 411 moves downward synchronously, and because the side wall of the push ring 411 is in close contact with the side wall of the sealing cylinder 31, the movement path of the needle 41 can be limited by the push ring 411 when the needle 41 moves downward, so as to keep the vertical penetration of the needle 41, and the caulking agent 33 below the push ring 411 can flow out from the flexible layer 32 at the bottom end of the sealing cylinder 31 during the downward movement of the push ring 411, which can increase the tightness of the filling of the space below compared with the flow under the action of gravity only.

[0060] Please refer to Figure 1 、 Figure 2 and Figure 7 , the two ends of the upper layer bottom plate 11 and the lower layer bottom plate 12 are fixed with support seats 5, the inner side of the upper layer bottom plate 11 and the inner side of the lower layer bottom plate 12 are both provided with a plurality of straight grooves 111, and the support seat 5 is provided with a bolt 6 penetrating the straight grooves 111;

[0061] In use, the support seat 5 is fixedly connected to the corresponding side wall away from the multilayer floor 1. Since the distance between the two side walls in the tunnel is not completely equal, the relative position of the bolt 6 in the straight slot 111 is adjusted to compensate for the gap between the multilayer floor 1 and the side wall of the tunnel. Before the side wall of the tunnel exerts pressure on the floor, the bolt 6 exerts an inward pressure on the multilayer floor 1 along its own axis to fix the position of the support plate. When the two side walls exert an inward extrusion force on the multilayer floor 1, the bolts 6 on both sides of the multilayer floor 1 move towards each other along the straight slot 111 to absorb the initial deformation energy. When the side wall of the bolt 6 abuts against the end of the straight slot 111, the two side walls form a rigid abutment with the multilayer floor 1 through the support seat 5 and the bolt 6. The contact area between the bolt 6 and the multilayer floor 1 increases, thereby maintaining high stability after the bolt 6 slides. This way can provide space for the adjusting rod 21 and provide stable support for the floor after the trigger is triggered. The bolt 6 changes from a "buffer" to a "pressure bearing pile". When the reinforcing system is triggered, the bolt itself becomes a permanent anchoring point for the floor anti-sliding, realizing "one bolt with double effect" to maintain stable transition and improve the stability of the contact between the support seat 5 and the multilayer floor 1.

[0062] Please refer to Figure 1 The support frame 13 is located between the support seat 5 of the upper layer floor 11 and the support seat 5 of the lower layer floor 12, and a plurality of limiting holes 131 are provided in the inner side of the support frame 13. The upper and lower ends of the support frame 13 are fixedly connected with the support frame 13 on the upper layer floor 11 and the support frame 13 on the lower layer floor 12, respectively.

[0063] The support frame 13 is fixedly connected with the support frame 13 on the same side of the upper layer floor 11 and the lower layer floor 12, thereby further improving the stability between the upper layer floor 11 and the lower layer floor 12. The adjusting rod 21 passes through the limiting hole 131 of the support frame 13 and is slidingly connected with the support frame 13. When the tunnel floor surface is locally depressed, the support frame 13 prevents the upper layer floor 11 from collapsing and deforming by the bending stiffness, which is beneficial to reduce the occurrence of floor heave.

[0064] Please refer to Figures 2 to 3 The end of the adjusting rod 21 away from the oil cylinder 22 is fixedly connected with a side plate 212, and a plurality of supporting springs 213 are arranged between the adjusting rod 21 and the support frame 13.

[0065] The side plate 212 increases the contact area between the adjusting rod 21 and the side wall rock mass, which is beneficial to improve the stability of the connection between the side wall and the force transmission structure 2.

[0066] And support spring 213 normal push side plate 212 close to the side of the hill, eliminate the installation gap, when the side of the rock mass creep shrinkage, support spring 213 automatically compensate displacement, maintain constant pressure contact, help to ensure that the adjusting rod 21 can respond to the side of the small deformation in time, avoid the existence of transmission force lag due to gap. At the same time, the constant pressure contact state can reduce the adjusting rod 21 and the side of the wear between, prolong the service life of the force transmission structure 2, and can make the pressure of the side of the hill more evenly transmitted to the adjusting rod 21, improve the stability and reliability of the whole supporting system force transmission, further enhance the adaptability to the deformation of roadway.

[0067] The upper layer of the floor 11 is detachably connected with a plurality of horizontal plates 7, and the two ends of the horizontal plate 7 are respectively connected with the support seat 5 of the upper layer of the floor 11 which is symmetrically arranged;

[0068] In use, the propulsion assembly is installed on the support seat 5 of the upper layer of the floor 11, the two support seats 5 are driven to move reversely by the propulsion assembly, and the positions of the support seats 5 are re-fixed, then a plurality of horizontal plates 7 can be connected between the parallel bolts 6 on the two support seats 5 to further strengthen the overall supporting strength of the multi-layer floor 1.

[0069] The propulsion assembly is an electric telescopic rod, and the mutually symmetrical support seats 5 are reversely moved by the electric telescopic rod;

[0070] Or the propulsion assembly is a double-end screw rod, the screw threads at the two ends of the double-end screw rod are opposite in direction, and the outside of the double-end screw rod is fixed with a threaded seat, when the double-end screw rod rotates, the threaded seat meshing with the screw threads is reversely moved, and then the support seat 5 is reversely moved, and then the position of the support seat 5 is reset.

[0071] The coal mine roadway anti-floor drum device provided by the present application will be further described below in combination with the drawings and embodiments.

[0072] A concrete lower layer floor 12 is poured in advance on the floor surface of the roadway, and a containing hole is arranged in the concrete lower layer floor 12 to install a filling assembly 3, and a filling agent 33 is sealingly arranged in the filling assembly 3.

[0073] The support seat 5 at the two ends of the floor is connected with the side of the roadway through the straight slot 111 penetrated by the bolt 6, and can be adjusted in position and pre-tightening force is applied; one end of the adjusting rod 21 is fixed with the side plate 212 close to the side of the hill (a support spring 213 can be arranged for compensation), and the other end penetrates the limiting hole 131 of the support frame 13.

[0074] The gap layer fixes the force transmission structure 2: the adjusting rod 21 with the piston 211 end slides into the two side outlets of the oil cylinder 22; the oil cylinder 22 is connected with the guide pipe 24, and a slidable piston rod 23 is arranged in the oil cylinder 22. The trigger 4 (the needle 41 with the puncture part 42 and the push ring 411) penetrates the lower end through hole (with a rectangular groove 222 and a rubber layer 221 for sealing) of the oil cylinder 22 and is inserted into the sealing cylinder 31 of the filling assembly 3.

[0075] When the inner pressure of the deformed side wall of the inclined roadway pushes the lower floor 12, the adjusting rods 21 fixed thereon slide towards each other. The end piston 211 of the adjusting rod 21 pushes the hydraulic oil in the oil cylinder 22 to flow to the guide pipe 24, driving the piston rod 23 to move upwards. The piston rod 23 upwardly lifts the upper structure fixedly connected thereto. The upward lifting force generated is designed to be opposite to (collinear with) the downward component force of the upper structure along the inclined roadway due to gravity, so as to offset or reduce the downward component force.

[0076] At the same time, when the adjusting rods 21 continue to slide towards each other, the piston 211 of the adjusting rod 21 moves to the position of the rectangular groove 222 in the oil cylinder 22, and the connecting plate 43 is pressed to rotate downwards. The connecting plate 43 drives the needle 41 to move downwards, and the puncture part 42 of the needle 41 pierces the flexible layer 32 at the bottom of the sealing cylinder 31.

[0077] The push ring 411 carried by the needle 41 moves downwards synchronously, and pushes the caulking agent 33 below to flow out through the broken hole and fill the gap between the lower floor 12 and the floor surface of the roadway, and harden to enhance the stability of the foundation.

[0078] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] The basic principles, main features and advantages of the present disclosure are shown and described above. It should be understood by those skilled in the art that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, various changes and improvements can be made to the present disclosure, and these changes and improvements all fall within the scope of the claimed present disclosure.

Claims

1. A device for preventing floor heave in a coal mine tunnel, characterised in that, The utility model relates to a kind of mine roof support, including: Multi-layer floor (1) is arranged on roadway floor, and the multi-layer floor (1) includes lower floor (12), upper floor (11) and support frame (13);The lower floor (12) is located above roadway floor, and the upper floor (11) is arranged on the upper side of the lower floor (12);The support frame (13) is slidably arranged between the upper floor (11) and the lower floor (12), and forms gap layer between the upper floor (11) and the lower floor (12); Force transmission structure (2) is fixedly arranged in gap layer;The force transmission structure (2) includes adjusting rod (21), oil cylinder (22) and piston rod (23);One end of the adjusting rod (21) is used to fixedly connect roadway side wall, and the other end is slidably connected with the oil cylinder (22);A plurality of outlets are symmetrically formed on the two sides of the oil cylinder (22), and the upper end of the oil cylinder (22) is fixedly connected with guide pipe (24) penetrating its interior;A plurality of adjusting rods (21) are slidably arranged in corresponding outlets respectively, and the piston rod (23) is slidably arranged at the upper end of the guide pipe (24); A plurality of caulking components (3) are arranged in the lower floor (12); Trigger (4) is arranged between the oil cylinder (22) and the caulking component (3), and penetrates the lower end surface of the oil cylinder (22);The adjusting rod (21) is pressed when sliding along the bottom surface of the oil cylinder (22), and the trigger (4) triggers the caulking component (3).

2. The floor heave prevention device for a coal mine roadway according to claim 1, characterised in that, The caulking component (3) includes sealing cylinder (31), flexible layer (32) and caulking agent (33), and the inner side of the lower floor (12) is fixedly provided with sealing cylinder (31), the upper and lower ends of the sealing cylinder (31) are fixedly connected with flexible layer (32), and the inner side of the sealing cylinder (31) is filled with caulking agent (33).

3. The floor heave prevention device for a coal mine roadway of claim 2, characterised in that, The trigger (4) includes needle (41), puncture part (42) and connecting plate (43), and the inner side of the sealing cylinder (31) is provided with needle (41) penetrating the upper flexible layer (32), the bottom of the needle (41) is provided with sharp puncture part (42), the upper end of the needle (41) is arranged through the oil cylinder (22), and the upper end of the needle (41) is rotatably connected with a plurality of connecting plates (43).

4. The floor heave prevention device for a coal mine roadway of claim 3, characterised in that, The material of the caulking agent (33) is epoxy resin adhesive or mine rock layer reinforcing agent.

5. The floor heave prevention device for a coal mine roadway of claim 4, characterised in that, The inner side of the oil cylinder (22) is provided with a through hole corresponding to the needle (41), one end of the adjusting rod (21) inserted into the oil cylinder (22) is fixedly provided with a piston (211), one end of the through hole close to the inner side of the oil cylinder (22) is provided with a rectangular groove (222), the upper edge of the rectangular groove (222) is sealingly surrounded by a rubber layer (221), and the width of the rectangular groove (222) is matched with the width of the connecting plate (43), and the bottom end of the connecting plate (43) is slidably connected with the inner wall of the rectangular groove (222).

6. The floor heave prevention device for a coal mine roadway of claim 3, characterised in that, The outer side of the puncture part (42) is coaxially fixed with a push ring (411), and the side wall of the push ring (411) is attached to the inner wall of the sealing cylinder (31).

7. The floor heave control device for a coal mine roadway defined in claim 6, characterised in that, The upper layer bottom plate (11) and the lower layer bottom plate (12) are fixed with support seats (5) at both ends, and the inner side of the upper layer bottom plate (11) and the inner side of the lower layer bottom plate (12) are provided with a plurality of straight slots (111), and the support seat (5) is provided with a bolt (6) penetrating the straight slot (111).

8. The floor heave control device of claim 7, wherein, The support frame (13) is located between the support seat (5) of the upper layer bottom plate (11) and the support seat (5) of the lower layer bottom plate (12), and the inner side of the support frame (13) is provided with a plurality of limiting holes (131), and the upper and lower ends of the support frame (13) are respectively fixedly connected with the support frame (13) on the upper layer bottom plate (11) and the support frame (13) on the lower layer bottom plate (12).

9. The floor heave control device for a coal mine roadway defined in claim 8, characterised in that, The end of the adjusting rod (21) away from the oil cylinder (22) is fixed with a side plate (212), and a plurality of supporting springs (213) are arranged between the adjusting rod (21) and the support frame (13).

10. The floor heave control device for a coal mine roadway defined in claim 9, characterised in that, A plurality of horizontal plates (7) are detachably connected above the upper layer bottom plate (11), and the two ends of the horizontal plate (7) are respectively connected with the support seats (5) of the symmetrically arranged upper layer bottom plate (11).

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