Constant-resistance and large-deformation truss anchor cable supporting device

Abstract

The present invention relates to the field of roof supporting, and provides a constant-resistance and large-deformation truss anchor cable supporting device. The supporting device comprises a surface protection steel plate, sliding bodies, and inclined anchor cables; a slide channel is formed in each of the two ends of the surface protection steel plate in the length direction of the surface protection steel plate, and multiple groups of constant-resistance protrusions are arranged at intervals on the inner wall of the slide channel in the length direction of the surface protection steel plate; the sliding bodies are arranged in the corresponding slide channels, and can slide in the length direction of the surface protection steel plate by overcoming the resistance of the constant-resistance protrusions; one end of each inclined anchor cable is fixedly arranged on the corresponding sliding body, and the other end of the inclined anchor cable passes through a corresponding clearance hole in the surface protection steel plate and then is obliquely inserted outward into a roof to be supported. In the supporting device, the surface protection steel plate serving as a truss has a large surface protection area; the combination of the inclined anchor cables and the surface protection steel plate can provide high-compression pre-tightening forces in the vertical direction and the horizontal direction to the roof at the same time; and when the roof subsides, the surface protection steel plate yields the pressure by means of deformation, and the constant-resistance protrusions can provide constant resistance, so that the supporting device has high and lasting supporting strength and a good supporting effect.

Description

A constant resistance large deformation truss anchor cable support device Technical Field

[0001] The present invention relates to the technical field of roof support, and in particular to a constant resistance large deformation truss anchor cable support device. Background Art

[0002] For roadways with complex roof conditions, such as those located near goafs or overlying aquifers, the limited support range of the roadway roof necessitates a targeted surrounding rock control solution. However, existing support devices often offer weak support strength and poor support effectiveness. Summary of the Invention

[0003] The purpose of the present invention is to provide a constant resistance large deformation truss anchor cable support device to solve the technical problem of relatively weak support strength of the support device existing in the prior art.

[0004] The constant resistance large deformation truss anchor cable support device provided by the present invention includes a protective steel plate, a sliding body and an inclined anchor cable. The protective steel plate is provided with sliding channels at both ends along its length direction. The inner wall of the sliding channel is provided with multiple groups of constant resistance protrusions, and the multiple groups of constant resistance protrusions are arranged at intervals along the length direction of the protective steel plate; the protective steel plate is also provided with an avoidance hole; the sliding body is arranged in the sliding channel, and can slide along the length direction of the protective steel plate after overcoming the resistance of the constant resistance protrusion; one end of the inclined anchor cable is fixedly provided on the sliding body, and the other end passes through the avoidance hole and is obliquely inserted outward into the coal rock body of the roof to be supported.

[0005] The constant resistance large deformation truss anchor cable support device provided by the present invention can produce the following beneficial effects:

[0006] The constant resistance large deformation truss anchor cable support device provided by the present invention, as the protective steel plate of the truss, can implement surface contact support for the tunnel roof; the inclined anchor cable combined with the protective steel plate can simultaneously provide high extrusion preload in both the vertical and horizontal directions to the tunnel roof, so that the coal rock mass in the anchoring area is in a multi-directional high pressure stress state; when the roof sinks, the protective steel plate deforms to release the pressure, and at the same time, the sliding body overcomes the resistance of the constant resistance protrusion in the sliding channel and slides toward the end of the protective steel plate to achieve deformation release. That is, the constant resistance large deformation truss anchor cable support device provided by the present invention has a relatively large protective surface area, can provide high preload in multiple directions, and can provide constant resistance when the roof sinks, so the support strength is high and long-lasting, and the support effect is good.

[0007] Furthermore, the sliding channel is closed along the circumferential direction.

[0008] Under this technical solution, the channel wall of the sliding channel can provide good protection for the constant resistance protrusion and the part of the sliding body located in the sliding channel, and can also effectively prevent debris from entering the sliding channel and causing the sliding body to slide unsmoothly.

[0009] Furthermore, the constant resistance protrusion is a thread.

[0010] Furthermore, the thread is a rigid thread.

[0011] Furthermore, the avoidance hole is an oblong hole, and the length direction of the avoidance hole is consistent with the sliding direction of the sliding body.

[0012] Under this technical solution, when the top plate sinks and deforms, the top plate applies force to the support device, the sliding body slides toward both ends, and at the same time the oblique anchor cable moves toward both ends along the avoidance hole.

[0013] Furthermore, the sliding body is provided with an anchor hole, which is connected to the avoidance hole, and from the end away from the surface protection steel plate to the end close to the surface protection steel plate, the anchor hole is inclined toward the end of the nearest surface protection steel plate; the oblique anchor cable is passed through the anchor hole.

[0014] Under this technical solution, during construction, one end of the inclined anchor cable anchored to the top plate is passed through the anchor cable hole and the avoidance hole in sequence, and then obliquely inserted into the top plate.

[0015] Furthermore, the support device also includes a reinforcing anchor cable, and the surface protection steel plate is fixed with fixing plates at both ends along its length direction, and the two ends of the reinforcing anchor cable are respectively fixed to the corresponding fixing plates.

[0016] Under this technical solution, the reinforced anchor cables can also provide resistance against deformation of the top plate, so the reinforced anchor cables can enhance the support strength of the support device.

[0017] Furthermore, the number of the reinforcing anchor cables is two, and along the width direction of the surface guard steel plate, the two reinforcing anchor cables are respectively arranged on both sides of the sliding body.

[0018] Furthermore, along the width direction of the surface protection steel plate, the two reinforcing anchor cables are symmetrically arranged on both sides of the sliding body.

[0019] Under this technical solution, the support strength of the support device is symmetrical, and the support effect on the top plate is relatively balanced.

[0020] Furthermore, the length direction of the reinforcing anchor cable is consistent with the length direction of the surface protection steel plate.

[0021] Furthermore, along the width direction of the surface guard steel plate, a guide hole is provided on at least one side of the sliding body, and the extension direction of the guide hole is consistent with the movement direction of the sliding body; the reinforcing anchor cable is passed through the guide hole on the same side thereof, and the sliding body can slide along the reinforcing anchor cable.

[0022] Under this technical solution, the strengthened anchor cables not only improve the support strength, but also serve to limit and guide the sliding body.

[0023] Furthermore, the surface protection steel plate is also fixedly provided with at least one limiting tube, the center lines of the limiting tube and the reinforcing anchor cable coincide with each other, and the reinforcing anchor cable is passed through the limiting tube.

[0024] Under this technical solution, the limiting tube plays a limiting role on the reinforcing anchor cable, which can effectively prevent the reinforcing anchor cable from detaching from the protective steel plate when the protective steel plate is subjected to pressure deformation, thereby improving the support effect.

[0025] Furthermore, the surface protection steel plate is a flat steel plate, or the surface protection steel plate is a W steel strip.

[0026] Under this technical solution, compared with traditional I-beams and channel steels, flat steel plates and W-steel strips have certain deformation capabilities. When the top plate sinks, they can deform and yield to pressure. Therefore, the use of flat steel plates or W-steel strips can improve the flexibility of the truss and help achieve flexible support. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] FIG1 is a partial cross-sectional structural diagram of a constant resistance large deformation truss anchor cable support device provided by an embodiment of the present invention;

[0029] FIG2 is a schematic diagram of the longitudinal cross-section structure of a constant resistance large deformation truss anchor cable support device provided by an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 100-surface protection steel plate; 110-avoidance hole;

[0032] 200-sliding body; 210-anchor hole;

[0033] 300-sliding channel; 310-thread;

[0034] 400-slant anchor cable;

[0035] 510-reinforced anchor cable; 520-fixing plate; 530-fixing piece; 540-limiting tube. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. 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.

[0037] The present embodiment provides a constant resistance large deformation truss anchor cable support device, as shown in Figures 1 and 2, the support device includes a protective steel plate 100, a sliding body 200 and an inclined anchor cable 400, the protective steel plate 100 is provided with sliding channels 300 at both ends along its length direction, the inner wall of the sliding channel 300 is provided with multiple groups of constant resistance protrusions, and the multiple groups of constant resistance protrusions are arranged at intervals along the length direction of the protective steel plate 100; the protective steel plate 100 is also provided with an avoidance hole 110; the sliding body 200 is arranged in the sliding channel 300, and can slide along the length direction of the protective steel plate 100 after overcoming the resistance of the constant resistance protrusion; one end of the inclined anchor cable 400 is fixedly provided on the sliding body 200, and the other end passes through the avoidance hole 110 and is obliquely inserted outward into the coal rock body of the roof to be supported.

[0038] The constant resistance, large deformation truss anchor cable support device provided in this embodiment, as the truss's surface protection steel plate 100, can implement surface contact support for the tunnel roof. The inclined anchor cable 400, in conjunction with the surface protection steel plate 100, can simultaneously provide high extrusion preload in both vertical and horizontal directions to the tunnel roof, placing the coal and rock mass in the anchoring area in a multi-directional high-pressure stress state. When the roof sinks, the surface protection steel plate 100 deforms to release the pressure, while the sliding body 200 overcomes the resistance of the constant resistance protrusion in the sliding channel 300 and slides toward the end of the surface protection steel plate 100 to achieve deformation release. That is, the constant resistance, large deformation truss anchor cable support device provided in this embodiment has a relatively large surface protection area, can provide high preload in multiple directions, and can provide constant resistance when the roof sinks, so the support strength is high and long-lasting, and the support effect is good.

[0039] Specifically, in this embodiment, the sliding channel 300 is circumferentially closed. Under this arrangement, the channel wall of the sliding channel 300 can provide good protection for the constant resistance protrusion and the portion of the sliding body 200 located in the sliding channel 300, and can also effectively prevent debris from entering the sliding channel 300, causing the sliding body 200 to slide unsmoothly. Of course, in other embodiments of the present application, the sliding channel 300 is not limited to being a circumferentially closed channel, but can also have an opening. For example, the channel wall of the sliding channel 300 opposite to the surface protection steel plate 100 is provided with an opening, which can extend along the length of the surface protection steel plate 100 and can pass through both ends of the channel wall. As for the width of the opening, it can be determined according to the width of the sliding body 200, as long as the channel wall can limit the sliding body 200 located in the sliding channel 300.

[0040] Specifically, in this embodiment, the cross section of the sliding channel 300 perpendicular to its axial direction is in a square frame shape.

[0041] Specifically, in this embodiment, as shown in Figures 1 and 2 , each sidewall of the sliding channel 300 is provided with constant-resistance protrusions. This arrangement provides relatively high resistance, thereby being able to withstand the relatively large deformation pressure of the top plate. Of course, in other embodiments of the present application, only a portion of the sidewalls may be provided with constant-resistance protrusions. For example, only two sidewalls that are opposite each other along the width of the surface guard steel plate 100 may be provided with constant-resistance protrusions, as long as the resistance requirements are met.

[0042] Specifically, in this embodiment, the constant resistance protrusion is a thread 310. A circle of thread 310 can be a group of constant resistance protrusions. Further, the thread 310 is a rigid thread, that is, the thread 310 needs to have a certain strength to provide the required resistance.

[0043] It should be noted that in other embodiments of the present application, the constant resistance protrusions are not limited to being threads 310, but may also be of other structural forms, for example, the constant resistance protrusions are protrusions with a trapezoidal cross-section. In addition, in this embodiment, a set of constant resistance protrusions is a complete circle of protrusions. However, in other embodiments of the present application, a set of constant resistance protrusions may also be a plurality of protrusions spaced apart along the circumference. In other words, as long as a constant resistance can be provided, the present application does not impose any restrictions on the specific structural form and arrangement of the constant resistance protrusions.

[0044] Specifically, in this embodiment, the avoidance hole 110 is an oblong hole, and the length direction of the avoidance hole 110 is consistent with the sliding direction of the sliding body 200. When the roof sinks and deforms, the roof exerts a force on the support device, causing the sliding body 200 to slide toward both ends, and at the same time, the inclined anchor cable 400 moves toward both ends along the avoidance hole 110.

[0045] Specifically, in this embodiment, as shown in Figures 1 and 2, the sliding body 200 is provided with an anchor hole 210, which is connected to the avoidance hole 110. The anchor hole 210 is inclined toward the end of the nearest surface protection steel plate 100 from the end away from the surface protection steel plate 100 to the end close to the surface protection steel plate 100. The oblique anchor cable 400 is passed through the anchor hole 210. During construction, the end of the oblique anchor cable 400 anchored to the top plate is passed through the anchor hole 210 and the avoidance hole 110 in sequence, and then inserted obliquely into the top plate.

[0046] Specifically, in this embodiment, as shown in FIG1 , the support device further includes reinforcing anchor cables 510. Fixing plates 520 are fixedly disposed at both ends of the surface steel plate 100 along its length, and both ends of the reinforcing anchor cables 510 are respectively fixed to corresponding fixing plates 520. In this arrangement, the reinforcing anchor cables 510 can also provide resistance to deformation of the roof, thereby enhancing the support strength of the support device.

[0047] Specifically, in this embodiment, the reinforcing anchor cable 510 is fixed to the fixing plate 520 via the fixing member 530. Furthermore, the reinforcing anchor cable 510 is a steel strand; the fixing member 530 is a lock.

[0048] Specifically, in this embodiment, as shown in FIG1 , there are two reinforcing anchor cables 510 , and the two reinforcing anchor cables 510 are respectively arranged on both sides of the sliding body 200 along the width direction of the surface protection steel plate 100 .

[0049] More specifically, in this embodiment, two reinforcing anchor cables 510 are symmetrically arranged on both sides of the sliding body 200 along the width direction of the surface protection steel plate 100. In this way, the support strength of the support device is symmetrical, and the support effect on the top plate is relatively balanced.

[0050] Specifically, in this embodiment, as shown in FIG1 , the length direction of the reinforcing anchor cable 510 is consistent with the length direction of the surface protection steel plate 100 .

[0051] Specifically, in this embodiment, guide holes are provided on both sides of the sliding body 200 along the width of the surface protection steel plate 100. The extending direction of the guide holes is consistent with the movement direction of the sliding body 200. The reinforcing anchor cable 510 is inserted through the guide hole on the same side, and the sliding body 200 can slide along the reinforcing anchor cable 510. In this arrangement, the reinforcing anchor cable 510 not only serves to increase the support strength, but also serves to limit and guide the sliding body 200.

[0052] It should be noted that in other embodiments of the present application, the sliding body 200 is not limited to having guide holes on both sides; it may also be provided with a guide hole on only one side. Furthermore, the structure used to guide the sliding body 200 during sliding is not limited to the guide holes and the reinforcing anchor cable 510, but may also be other structures. For example, the surface protection steel plate 100 may be provided with a slide groove, and the sliding body 200 may be provided with a slider that matches the slide groove. When the sliding body 200 moves, the slider slides along the slide groove.

[0053] Specifically, in this embodiment, the fixing plate 520 is disposed opposite the end of the sliding channel 300. The fixing plate 520 can prevent the sliding body 200 from sliding out of the end of the sliding channel 300. With this arrangement, the fixing plate 520 not only secures the reinforcing anchor cable 510 but also prevents the sliding body 200 from slipping out of the sliding channel 300. Furthermore, the forces exerted on the fixing plate 520 by the reinforcing anchor cable 510 and the sliding body 200 are in opposite directions. Therefore, the reinforcing anchor cable 510 can, with the help of the fixing plate 520, prevent the sliding body 200 from slipping out of the sliding channel 300, while the sliding body 200 can apply tension to the reinforcing anchor cable 510 through the fixing plate 520, thereby enhancing the support force of the reinforcing anchor cable 510.

[0054] Specifically, in this embodiment, the surface protection steel plate 100 is further fixedly provided with at least one limiting tube 540. The center lines of the limiting tube 540 and the reinforcing anchor cable 510 coincide with each other, and the reinforcing anchor cable 510 is passed through the limiting tube 540. In this arrangement, the limiting tube 540 limits the reinforcing anchor cable 510, effectively preventing the reinforcing anchor cable 510 from detaching from the surface protection steel plate 100 when the surface protection steel plate 100 is deformed under pressure, thereby improving the support effect.

[0055] More specifically, in this embodiment, each reinforcing anchor cable 510 is configured with three limiting tubes 540 , and along the length direction of the surface protection steel plate 100 , one of them is centrally arranged, and the other two are respectively arranged near one end.

[0056] Preferably, the guide hole of the sliding body 200 is located between two adjacent limiting tubes 540, and the limiting tube 540 arranged near the end of the surface protection steel plate 100 can block the sliding of the sliding body 200 to prevent it from sliding out of the port of the sliding channel 300.

[0057] Specifically, in this embodiment, the surface protection steel plate 100 is a flat steel plate or a W-shaped steel strip. Compared to traditional I-beams and channel steels, flat steel plates and W-shaped steel strips have a certain degree of deformation capability. When the top plate sinks, they can deform and yield. Therefore, the use of flat steel plates or W-shaped steel strips can improve the flexibility of the truss and help achieve flexible support.

[0058] In summary, the working process of the constant resistance large deformation truss anchor cable support device provided in this embodiment is roughly as follows:

[0059] After the above-mentioned constant resistance large deformation truss anchor cable support device is constructed on the roadway roof, the support device applies multi-directional high preload force to the roof;

[0060] When the top plate deforms and sinks, the surface protection steel plate 100 deforms and yields to pressure, and at the same time, the sliding body 200 slides toward both ends of the surface protection steel plate 100 under the push of the horizontal component force applied by the top plate to the support device;

[0061] The constant resistance protrusion (i.e., thread 310) arranged on the inner surface of the sliding channel 300 blocks the sliding of the sliding body 200. When the horizontal thrust is greater than the resistance of the constant resistance protrusion, the sliding body 200 destroys the constant resistance protrusion and moves further.

[0062] Each time the sliding body 200 destroys a set of constant resistance protrusions (i.e., a circle of threads 310), it will encounter the same resistance when sliding to the next set of constant resistance protrusions. Multiple sets of constant resistance protrusions prevent the truss anchor cable support device from failing by providing constant working resistance until the horizontal component force is less than the resistance of the constant resistance protrusion, thereby achieving the purpose of deformation and pressure relief.

[0063] The truss anchor cable support device provided in this embodiment has a large protective surface area, can provide high preload in both vertical and horizontal directions, can allow compressive deformation to adapt to the characteristics of the tunnel roof sinking, and can maintain a constant working resistance during the compressive deformation process to achieve constant resistance compressive support. It can be used to support the roof of a close-range goaf or a close-range aquifer, has obvious advantages in strengthening roof support and improving tunnel stability, and can make up for the deficiency of reduced support strength caused by the limited length of the roof support.

[0064] Finally, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0065] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A constant resistance large deformation truss anchor cable support device, characterized in that: include: A surface protection steel plate (100), wherein both ends of the surface protection steel plate (100) along the length direction thereof are provided with sliding channels (300), the inner wall of the sliding channel (300) is provided with a plurality of groups of constant resistance protrusions, and the plurality of groups of constant resistance protrusions are arranged at intervals along the length direction of the surface protection steel plate (100); the surface protection steel plate (100) is also provided with avoidance holes (110); A sliding body (200), wherein the sliding body (200) is arranged in the sliding channel (300) and can slide along the length direction of the surface protection steel plate (100) after overcoming the resistance of the constant resistance protrusion; An oblique anchor cable (400), one end of which is fixedly arranged on the sliding body (200), and the other end of which passes through the avoidance hole (110) and is then obliquely inserted outwards into the coal rock mass of the roof to be supported.

2. The constant resistance large deformation truss anchor cable support device according to claim 1 is characterized in that: The sliding channel (300) is arranged to be closed along the circumferential direction.

3. The constant resistance large deformation truss anchor cable support device according to claim 1 is characterized in that: The constant resistance protrusion is a thread (310).

4. The constant resistance large deformation truss anchor cable support device according to claim 1 is characterized in that: The avoidance hole (110) is an oblong hole, and the length direction of the avoidance hole (110) is consistent with the sliding direction of the sliding body (200).

5. The constant resistance large deformation truss anchor cable support device according to claim 1, characterized in that: The sliding body (200) is provided with an anchor hole (210), the anchor hole (210) is connected to the avoidance hole (110), and from an end away from the surface protection steel plate (100) to an end close to the surface protection steel plate (100), the anchor hole (210) is inclined toward the end of the nearest surface protection steel plate (100); the oblique anchor cable (400) is passed through the anchor hole (210).

6. The constant resistance large deformation truss anchor cable support device according to any one of claims 1 to 5, characterized in that: The support device further comprises a reinforcing anchor cable (510), and fixing plates (520) are fixedly provided at both ends of the surface protection steel plate (100) along its length direction, and both ends of the reinforcing anchor cable (510) are respectively fixedly provided on the corresponding fixing plates (520).

7. The constant resistance large deformation truss anchor cable support device according to claim 6, characterized in that: The number of the reinforcing anchor cables (510) is two, and along the width direction of the surface protection steel plate (100), the two reinforcing anchor cables (510) are respectively arranged on both sides of the sliding body (200).

8. The constant resistance large deformation truss anchor cable support device according to claim 6, characterized in that: A guide hole is provided on at least one side of the sliding body (200) along the width direction of the surface protection steel plate (100), and the extension direction of the guide hole is consistent with the movement direction of the sliding body (200); the reinforcing anchor cable (510) is passed through the guide hole on the same side thereof, and the sliding body (200) can slide along the reinforcing anchor cable (510).

9. The constant resistance large deformation truss anchor cable support device according to claim 6, characterized in that: The surface protection steel plate (100) is further fixedly provided with at least one position limiting tube (540), the center lines of the position limiting tube (540) and the reinforcing anchor cable (510) coincide with each other, and the reinforcing anchor cable (510) is passed through the position limiting tube (540).

10. The constant resistance large deformation truss anchor cable support device according to any one of claims 1 to 5, characterized in that: The surface protection steel plate (100) is a flat steel plate, or the surface protection steel plate (100) is a W steel strip.

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