High-stress roadway anti-impact truss anchor cable device

Abstract

The utility model belongs to the technical field of coal mining, and discloses a high-stress roadway anti-impact truss anchor cable device which comprises a connecting plate. A pair of symmetrically arranged anchor rods is arranged on the connecting plate, and the anchor rods penetrate through the connecting plate and are in sliding connection with the connecting plate; spirally-distributed threaded teeth are arranged on the circumferential wall of one end of each anchor rod, the threaded teeth are located on any side of the connecting plate, and the anchor rods are sleeved with nuts in threaded connection with the threaded teeth; the anchor rods are sleeved with slidably-connected pressure plates, and the pressure plates are located on the sides, away from the nuts, of the connecting plates. The anchor rods are sleeved with first springs, the first springs are located between the pressing disc and the connecting plate, and the two ends of each first spring are connected with the pressing disc and the connecting plate correspondingly. A pair of sleeves is fixed on the connecting plate; the nut can be screwed to move along the thread teeth according to the condition change of the surrounding rock, and then the initial supporting force applied to the surrounding rock by the first spring and the pressing disc is adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mining, and in particular relates to a high-stress tunnel anti-impact truss anchor cable device. Background Art

[0002] With the increase in the depth and intensity of coal mining, dynamic disasters such as rock burst are occurring more frequently, seriously restricting the safe production of the coal industry. Rock burst refers to the sudden destruction, collapse or ejection of coal or rock with a large amount of elastic energy under high stress during coal mining, which occurs under certain conditions. This causes a sudden release of energy and produces obvious dynamic effects such as sound, vibration and air waves. The danger level is more serious than general mine pressure and can cause serious natural hazards in underground mining. The surrounding geological environment of the tunnel after the impact is very complex. Faced with this high stress and large deformation tunnel situation, tunnel support has always been a difficult problem in coal mining.

[0003] For example, the Chinese patent application number CN202123060867.0 discloses a high-stress tunnel anti-impact truss anchor cable device, including surrounding rock, a steel strand rod body, a constant resistance pressure relief spring and an anchor cable lock; one end of the steel strand rod body is installed in the surrounding rock, and a channel steel is installed on the steel strand rod body outside the surrounding rock, and a tray 2 is installed on the outside of the channel steel, and an anchor cable lock is installed on the outside of the tray 2; a tray 1 is installed on the steel strand rod body in the surrounding rock, and a constant resistance pressure relief spring is installed between the tray 1 and the channel steel, and the constant resistance pressure relief spring is in a compressed state. The high-stress tunnel anti-impact truss anchor cable device of this utility model can not only solve the problem of high-stress tunnel impact mine pressure, but also enhance the tunnel side support strength through the truss structure, so that the entire support forms an integral structure and effectively controls the side drum; when excavating in a dynamic pressure tunnel, it can solve the serious side drum problem and solve the problem of high wall expansion cost. The device has a scientific and reasonable structure, is safe and convenient to use, has a simple structure and is low in cost.

[0004] Usually during tunnel excavation, especially in high-stress sections or weak surrounding rock areas, the deformation and stress distribution of the surrounding rock will be affected by the construction progress and external loads; and in the above-mentioned patent, since the constant-resistance pressure-reducing spring is inside the surrounding rock, when the surrounding rock is deformed, the initial compression amount of the constant-resistance pressure-reducing spring inside the surrounding rock may also undergo uncertain changes, and since the constant-resistance pressure-reducing spring is inside the surrounding rock, the staff cannot adjust it accordingly; therefore, there is a problem in the prior art that it is inconvenient to adjust the initial compression amount of the spring according to the changes in the surrounding rock. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a high-stress tunnel anti-impact truss anchor device, which solves the problem in the existing technology that it is inconvenient to adjust the initial compression amount of the spring according to the changes in the surrounding rock.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] High stress roadway anti-impact truss anchor device, including connecting plate;

[0008] A pair of symmetrically placed anchor rods are provided on the connecting plate, and both anchor rods pass through the connecting plate and are slidably connected to the connecting plate;

[0009] A spirally distributed threaded tooth is provided on the peripheral wall of one end of the anchor rod, and the threaded tooth is located on either side of the connecting plate. A nut threadedly connected to the threaded tooth is sleeved on the anchor rod;

[0010] The anchor rods are all sleeved with sliding connection pressure plates, which are all located on the side of the connecting plate away from the nut;

[0011] The anchor rods are all sleeved with first springs, which are located between the pressure plate and the connecting plate, and both ends of the first springs are respectively connected to the pressure plate and the connecting plate;

[0012] A pair of sleeves are fixed on the connecting plate, and both ends of the sleeves are open. The two sleeves correspond to the anchor rods one by one. The sleeves are placed coaxially with the corresponding anchor rods. The maximum distance between the thread teeth and the center axis of the anchor rod is less than the inner radius of the sleeve, and the ends of the sleeves away from the connecting plate are in contact with the nuts.

[0013] The principles and effects of the above technical solution are as follows:

[0014] During use, the end of the anchor rod away from the threaded teeth is fixed inside the surrounding rock of the tunnel, and the pressure plate away from the nut end is attached to the outer wall of the surrounding rock, and then the nut is turned to make the nut approach the surrounding rock continuously. During the movement of the nut, the sleeve and the connecting plate are pushed, and the connecting plate squeezes and compresses the first spring. After the first spring is compressed, it pushes the pressure plate to squeeze and support the surrounding rock. The elastic force of the first spring is the initial support force of the pressure plate on the surrounding rock. In the subsequent use, according to the changes in the situation of the surrounding rock, the nut can be turned to move along the threaded teeth, and the initial compression amount of the first spring can be adjusted accordingly, thereby adjusting the initial support force applied to the surrounding rock by the first spring and the pressure plate.

[0015] A first slider is fixed at both ends of the first spring. The first slider is slidably sleeved on the anchor rod. The first sliders at both ends of the first spring are fixed to the connecting plate and the pressure plate respectively.

[0016] A pair of symmetrically placed second sliders are provided on one side of the connecting plate away from the nut. The two second sliders are located between the two anchor rods. The arrangement direction of the two second sliders is parallel to the plane where the central axes of the two anchor rods are located. The second sliders are both located between the two first sliders on the corresponding end anchor rods.

[0017] A pair of symmetrically placed connecting rods are rotatably hinged on each of the second sliders, and the other ends of the two connecting rods are rotatably hinged to the two first sliders at the corresponding ends of the second slider;

[0018] A second spring is fixed between the two second sliders;

[0019] A telescopic rod is fixedly connected between the two second sliders, and the second spring is sleeved on the telescopic rod;

[0020] A first mounting groove is formed on one side of the two first sliders on any anchor rod near the other anchor rod, a first pin is fixed in each of the first mounting grooves, and the first pin is placed perpendicular to the plane where the two anchor rods are located; a pair of second mounting grooves is formed on each of the second sliders, and a second pin is fixed in each of the second mounting grooves and placed coaxially with the first pin, and both ends of the connecting rod are rotatably sleeved on the corresponding first pin and second pin respectively;

[0021] The thread spiral directions of the thread teeth on the two anchor rods are opposite;

[0022] There are two nuts for threaded connection on any anchor rod.

[0023] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0024] Fixed connection: refers to the process of connecting two separate profiles or parts into a complex part or component using fasteners such as screws, bolts and rivets.

[0025] Sliding connection: Two objects are in contact but not fixed, and can slide relative to each other.

[0026] Beneficial effects of the utility model:

[0027] 1. When in use, the end of the anchor rod away from the threaded teeth is fixed inside the surrounding rock of the tunnel, and the pressure plate away from the nut is attached to the outer wall of the surrounding rock. Then, the nut is screwed to make the nut approach the surrounding rock continuously. During the movement of the nut, the sleeve and the connecting plate are pushed. The connecting plate squeezes and compresses the first spring. After the first spring is compressed, it pushes the pressure plate to squeeze and support the surrounding rock. The elastic force of the first spring is the initial support force of the pressure plate on the surrounding rock. In the subsequent use, according to the changes in the surrounding rock conditions, the nut can be screwed to move along the threaded teeth to adjust the initial compression of the first spring accordingly, thereby adjusting the initial support force applied by the first spring and the pressure plate on the surrounding rock.

[0028] At the same time, the double anchor setting method in this application further improves the support and anti-scouring effect of the surrounding rock, and improves the stability and bearing capacity of the tunnel surrounding rock;

[0029] 2. Through the coordinated arrangement of the first slider, the second slider, the connecting rod, the second spring and the telescopic rod, when the surrounding rock impacts the pressure plate and moves along the anchor rod toward the end of the connecting plate, the pressure plate drives the first slider connected to it, and the first slider drives the connecting rod and the second slider in turn, so that the two second sliders approach each other, and the two second sliders squeeze and compress the second spring. Through the arrangement of the second spring and the connecting rod, the support and anti-impact performance of the surrounding rock is further improved, and at the same time, it is convenient to buffer and distribute the larger impact on the first spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0032] Figure 2 This is a partial structural diagram of the anchor rod of the utility model;

[0033] Figure 3 This is a partial structural diagram of the second spring of the present invention;

[0034] Figure 4 It is a partial structural diagram of the first pin shaft of the utility model. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Combined here Figures 1 to 4The following describes an embodiment of a high-stress tunnel anti-collision truss anchor device. Specifically, the high-stress tunnel anti-collision truss anchor device is constructed as a split structure, which has a connecting plate 100, an anchor rod 200, threaded teeth 201, a nut 202, a pressure plate 300, a first spring 400, a sleeve 500 and other components. When in use, the end of the anchor rod 200 away from the threaded teeth 201 is fixed to the inside of the surrounding rock of the tunnel, and the end of the pressure plate 300 away from the nut 202 is attached to the outer wall of the surrounding rock, and then the nut 202 is screwed to make the nut 202 approach the surrounding rock continuously. During the movement, the sleeve 500 and the connecting plate 100 are pushed, and the connecting plate 100 squeezes and compresses the first spring 400. After the first spring 400 is compressed, it pushes the pressure plate 300 to squeeze and support the surrounding rock. The elastic force of the first spring 400 is the initial support force of the pressure plate 300 on the surrounding rock. During subsequent use, according to the changes in the conditions of the surrounding rock, the nut 202 can be screwed and moved along the thread teeth 201, thereby adjusting the initial support force applied by the first spring 400 and the pressure plate 300 on the surrounding rock.

[0037] Please refer to Figures 1 to 4 , a high stress roadway anti-impact truss anchor device, comprising a connecting plate 100;

[0038] A pair of symmetrically placed anchor rods 200 are provided on the connecting plate 100 , and both anchor rods 200 pass through the connecting plate 100 and are slidably connected to the connecting plate 100 ;

[0039] A spirally distributed threaded tooth 201 is provided on the peripheral wall of one end of the anchor rod 200. The threaded tooth 201 is located on either side of the connecting plate 100. A nut 202 is sleeved on the anchor rod 200 and is threadably connected to the threaded tooth 201.

[0040] The anchor rods 200 are all sleeved with slidingly connected pressure plates 300, and the pressure plates 300 are all located on the side of the connecting plate 100 away from the nut 202;

[0041] The anchor rods 200 are each sleeved with a first spring 400, and the first spring 400 is located between the pressure plate 300 and the connecting plate 100, and both ends of the first spring 400 are respectively connected to the pressure plate 300 and the connecting plate 100;

[0042] A pair of sleeves 500 are fixed to the connecting plate 100. Both ends of the sleeves 500 are open. The two sleeves 500 correspond to the anchor rods 200 one by one. The sleeves 500 are placed coaxially with the corresponding anchor rods 200. The maximum distance between the thread teeth 201 and the central axis of the anchor rod 200 is less than the inner radius of the sleeve 500. The ends of the sleeves 500 away from the connecting plate 100 are in contact with the nuts 202.

[0043] Preferably, the anchor rod 200 in the present application includes a steel pipe and an anchor cable. The anchor cable and the steel pipe are placed coaxially and fixed inside the steel pipe. The threads on the anchor rod 200 are arranged on the outer wall of the steel pipe. The internal anchor cable is protected by the steel pipe to improve the corrosion resistance of the anchor cable.

[0044] Preferably, the sleeve 500 may be made of alloy steel, wear-resistant steel, etc. The surface of the sleeve 500 may be galvanized or coated to improve the corrosion resistance of the sleeve 500.

[0045] When in use, the end of the anchor rod 200 away from the threaded teeth 201 is fixed to the surrounding rock inside the tunnel, and the end of the pressure plate 300 away from the nut 202 is fitted on the outer wall of the surrounding rock, and then the nut 202 is screwed to make the nut 202 continue to approach the surrounding rock. During the movement of the nut 202, the sleeve 500 and the connecting plate 100 are pushed, and the connecting plate 100 squeezes and compresses the first spring 400. After the first spring 400 is compressed, it pushes the pressure plate 300 to squeeze and support the surrounding rock. The elastic force of the first spring 400 is the initial support force of the pressure plate 300 on the surrounding rock. In the subsequent use process, according to the changes in the situation of the surrounding rock, the nut 202 can be screwed to move along the threaded teeth 201, and then the initial support force applied to the surrounding rock by the first spring 400 and the pressure plate 300 can be adjusted;

[0046] At the same time, the arrangement of the double anchor rods 200 in the present application further improves the support and anti-impact effect on the surrounding rock, and improves the stability and bearing capacity of the tunnel surrounding rock.

[0047] A first slider 600 is fixed at both ends of the first spring 400, and the first slider 600 is slidably mounted on the anchor rod 200. The first sliders 600 at both ends of the first spring 400 are respectively fixed to the connecting plate 100 and the pressure plate 300; preferably, both ends of the spring are fixed inside the first slider 600 at the corresponding end to improve the stability of the connection to the first spring 400.

[0048] A pair of symmetrically placed second sliders 700 are provided on one side of the connecting plate 100 away from the nut 202. The two second sliders 700 are located between the two anchor rods 200. The arrangement direction of the two second sliders 700 is parallel to the plane where the central axes of the two anchor rods 200 are located. The second sliders 700 are located between the two first sliders 600 on the corresponding end anchor rods 200.

[0049] A pair of symmetrically placed connecting rods 800 are rotatably hinged on each of the second sliders 700, and the other ends of the two connecting rods 800 are rotatably hinged to the two first sliders 600 at the corresponding ends of the second slider 700;

[0050] A second spring 900 is fixed between the two second sliders 700;

[0051] When the surrounding rock impact pressure plate 300 moves along the anchor rod 200 toward the end of the connecting plate 100, the pressure plate 300 drives the first slider 600 connected to it, and the first slider 600 drives the connecting rod 800 and the second slider 700 in turn, so that the two second sliders 700 approach each other, and the two second sliders 700 squeeze and compress the second spring 900. Through the setting of the second spring 900 and the connecting rod 800, the support and anti-impact performance of the surrounding rock is further improved, and at the same time, it is convenient to buffer and distribute the larger impact on the first spring 400.

[0052] A telescopic rod 901 is fixedly connected between the two second sliders 700 , and the second spring 900 is sleeved on the telescopic rod 901 ; the arrangement of the telescopic rod 901 prevents the second spring 900 from twisting and deforming during the compression process.

[0053] A first mounting groove 601 is provided on the side of the two first sliders 600 on any anchor rod 200 close to the other anchor rod 200, and a first pin shaft 602 is fixed in the first mounting groove 601, and the first pin shaft 602 is placed perpendicular to the plane where the two anchor rods 200 are located. A pair of second mounting grooves 701 is provided on the second slider 700, and a second pin shaft 702 is fixed in the second mounting groove 701 and placed coaxially with the first pin shaft 602. Both ends of the connecting rod 800 are rotatably sleeved on the corresponding first pin shaft 602 and the second pin shaft 702 respectively; so as to realize the rotational articulation of the connecting rod 800 and the first slider 600 and the second slider 700.

[0054] The thread spiral directions of the thread teeth 201 on the two anchor rods 200 are opposite; since the surrounding rock will vibrate during excavation operations in the tunnel, which will in turn cause vibration of the anchor rods 200 and the connecting plate 100, the setting method of having the thread spiral directions of the two thread teeth 201 are opposite can reduce the risk of the two nuts 202 loosening or falling off at the same time, and improve the stability of the support and anti-impact.

[0055] There are two nuts 202 threadedly connected on any anchor rod 200; by disposing the nuts 202 on the thread teeth 201, the risk of the nuts 202 becoming loose and falling off is further reduced.

[0056] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements shall fall within the scope of the present invention.

Claims

1. A high-stress tunnel anti-impact truss anchor cable device, comprising a connecting plate (100), characterized in that: A pair of symmetrically placed anchor rods (200) are provided on the connecting plate (100), and the anchor rods (200) both pass through the connecting plate (100) and are slidably connected to the connecting plate (100); A spirally distributed threaded tooth (201) is provided on the peripheral wall of one end of the anchor rod (200), and the threaded tooth (201) is located on either side of the connecting plate (100). A nut (202) threadedly connected to the threaded tooth (201) is sleeved on the anchor rod (200); The anchor rods (200) are all sleeved with slidingly connected pressure plates (300), and the pressure plates (300) are all located on a side of the connecting plate (100) away from the nut (202); The anchor rods (200) are sleeved with first springs (400), the first springs (400) are located between the pressure plate (300) and the connecting plate (100), and both ends of the first springs (400) are respectively connected to the pressure plate (300) and the connecting plate (100); A pair of sleeves (500) are fixed on the connecting plate (100), both ends of the sleeves (500) are open, the two sleeves (500) correspond to the anchor rods (200) one by one, the sleeves (500) are coaxially arranged with the corresponding anchor rods (200), the maximum distance between the thread teeth (201) and the central axis of the anchor rod (200) is less than the inner radius of the sleeve (500), and the ends of the sleeves (500) away from the connecting plate (100) are in contact with the nuts (202).

2. The high stress tunnel anti-impact truss anchor cable device according to claim 1, characterized in that: A first slider (600) is fixed at both ends of the first spring (400), and the first slider (600) is slidably mounted on the anchor rod (200). The first sliders (600) at both ends of the first spring (400) are respectively fixed to the connecting plate (100) and the pressure plate (300).

3. The high stress tunnel anti-impact truss anchor cable device according to claim 2, characterized in that: A pair of symmetrically placed second sliders (700) are provided on one side of the connecting plate (100) away from the nut (202), the two second sliders (700) are located between the two anchor rods (200), the arrangement direction of the two second sliders (700) is parallel to the plane where the central axes of the two anchor rods (200) are located, and the second sliders (700) are both located between the two first sliders (600) on the corresponding end anchor rods (200); A pair of symmetrically placed connecting rods (800) are rotatably hinged on each of the second sliders (700), and the other ends of the two connecting rods (800) are rotatably hinged to the two first sliders (600) at the corresponding ends of the second slider (700); A second spring (900) is fixed between the two second sliders (700).

4. The high stress tunnel anti-collision truss anchor cable device according to claim 3, characterized in that: A telescopic rod (901) is fixedly connected between the two second sliders (700), and the second spring (900) is sleeved on the telescopic rod (901).

5. The high stress tunnel anti-impact truss anchor cable device according to claim 4, characterized in that: A first mounting groove (601) is provided on one side of the two first sliders (600) on any anchor rod (200) close to the other anchor rod (200), a first pin shaft (602) is fixed in the first mounting groove (601), and the first pin shaft (602) is placed perpendicular to the plane where the two anchor rods (200) are located, a pair of second mounting grooves (701) is provided on the second slider (700), a second pin shaft (702) placed coaxially with the first pin shaft (602) is fixed in the second mounting groove (701), and both ends of the connecting rod (800) are rotatably sleeved on the corresponding first pin shaft (602) and the second pin shaft (702).

6. The high stress tunnel anti-impact truss anchor cable device according to claim 5, characterized in that: The thread spiral directions of the thread teeth (201) on the two anchor rods (200) are opposite.

7. The high stress tunnel anti-impact truss anchor cable device according to claim 6, characterized in that: The number of nuts (202) threadedly connected to any anchor rod (200) is set to two.

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