Roof cutting support system for roadway

Abstract

The utility model provides a roadway roof-cutting supporting system which is arranged in a gob-side entry retaining and a gob with the top cut, the side, away from the gob with the top cut, of the gob-side entry retaining is a stoping face, an immediate roof is arranged above the gob-side entry retaining and the gob with the top cut, and the roadway roof-cutting supporting system comprises a pre-splitting roof-cutting structure, the cutting device is arranged at an immediate roof corresponding to the goaf to be subjected to roof cutting so as to cut off the immediate roof corresponding to the goaf to be subjected to roof cutting; the first supporting part is arranged between the gob-side entry retaining and the gob with the top to be cut, the first supporting part comprises a supporting base body and a supporting anchor rod arranged at the upper end of the supporting base body, the lower end of the supporting anchor rod is connected with the supporting base body, and the upper end of the supporting anchor rod extends into an immediate roof corresponding to the gob-side entry retaining; and the second supporting part is arranged between the first supporting part and the stoping face so as to support the immediate roof corresponding to the gob-side entry retaining. According to the technical scheme, the problem of waste of coal resources in related technologies can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine excavation, in particular to a tunnel top cutting support system. Background Art

[0002] Mineral resources are one of the material basic resources necessary for our economic construction and social development, and are the foundation for the survival and development of the mining industry. Coal is an important mineral resource and occupies a dominant position in my country's disposable energy consumption. Therefore, scientifically and rationally improving domestic coal mining technology is one of the key factors in the development of domestic coal. Leaving coal pillars in goafs has been widely used as one of the main methods commonly used in my country to maintain the stability of goaf-side lanes. With the continuous advancement of the working face, most of the coal pillars left in the goafs are scrapped resources, which will cause a large waste of coal resources.

[0003] Therefore, there exists a technical problem of waste of coal resources in the art. Utility Model Content

[0004] The main purpose of the utility model is to provide a tunnel cutting top support system to solve the problem of coal resource waste in the related technology.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a tunnel top cutting support system, which is arranged in the goaf-retained goaf and the goaf to be cut, the side of the goaf-retained goaf away from the goaf to be cut is the mining face, and there is a direct roof above the goaf-retained goaf and the goaf to be cut, and the tunnel top cutting support system includes: a pre-splitting top cutting structure, which is arranged at the direct roof corresponding to the goaf to be cut, so as to cut off the direct roof corresponding to the goaf to be cut; a first support part, which is arranged between the goaf-retained goaf and the goaf to be cut, the first support part includes a support base and a support anchor rod arranged at the upper end of the support base, the lower end of the support anchor rod is connected to the support base, and the upper end of the support anchor rod extends into the direct roof corresponding to the goaf-retained goaf; a second support part, which is arranged between the first support part and the mining face, so as to support the direct roof corresponding to the goaf-retained goaf.

[0006] Furthermore, the support matrix includes a plurality of support walls arranged at intervals, and each support wall includes a plurality of support columns arranged at intervals.

[0007] Furthermore, there are multiple supporting anchor rods, and the multiple supporting anchor rods are arranged in one-to-one correspondence with the multiple supporting columns. The supporting matrix also includes multiple connecting parts, and each supporting anchor rod is connected to the corresponding supporting column through a connecting part.

[0008] Furthermore, the connecting part includes a connecting plate and an insert tube arranged on the lower side of the connecting plate, the insert tube is plugged into the upper end of the supporting column, a mounting hole is arranged on the connecting plate, and the lower end of the supporting anchor rod is passed through the mounting hole.

[0009] Furthermore, the supporting matrix also includes a filling portion arranged between every two adjacent supporting walls.

[0010] Furthermore, a limited flow layer is provided between the supporting wall and the filling part.

[0011] Furthermore, the thickness of the filling part is between 0.8m and 1m; and / or, at least one supporting column includes a column body and a fixing part arranged at the lower end of the column body and extending into the base plate, and the length of the fixing part is between 500mm and 800mm.

[0012] Furthermore, there is a basic top above the direct top, and the second supporting part includes a plurality of supporting anchor cables arranged at intervals, and the upper ends of the supporting anchor cables pass through the direct top and the basic top.

[0013] Furthermore, the pre-splitting and top cutting structure extends in the up-down direction, and the pre-splitting and top cutting structure includes a foot line portion, a gun mud portion and an explosion portion. The lower end of the pre-splitting and top cutting structure extends out of the direct top, and the upper end of the pre-splitting and top cutting structure is located in the direct top. In the direction from bottom to top, the foot line portion, the gun mud portion and the explosion portion are arranged in sequence, and the lower end of the foot line portion forms the lower end of the pre-splitting and top cutting structure.

[0014] Further, the distance between the pre-splitting cutting structure and the mining surface in the mining direction is between 50m and 100m; and / or the distance between the explosion part and the lower surface of the direct roof in the up and down direction is between 6m and 7m.

[0015] By applying the technical solution of the utility model, the pre-splitting and cutting-roofing structure is arranged at the direct roof corresponding to the goaf to be cut, and the pre-splitting and cutting-roofing structure can cut off the direct roof corresponding to the goaf to be cut; the first supporting part is arranged between the goaf-retained tunnel and the goaf to be cut, and when the direct roof corresponding to the goaf to be cut is cut off, this part of the direct roof will collapse in the goaf to be cut, and the first supporting part can play a role in protecting the goaf-retained tunnel to ensure the safety of personnel and equipment working in the goaf-retained tunnel, wherein the first supporting part includes a supporting matrix and a supporting matrix arranged at The support anchor at the upper end of the support base is used to stop the rocks formed by the collapse of the direct roof in the goaf to be cut off to protect the workers and equipment in the goaf-retained tunnel. The lower end of the support anchor is connected to the support base, and the upper end of the support anchor extends into the direct roof corresponding to the goaf-retained tunnel. The support anchor is used to reinforce the corresponding part of the direct roof along the goaf-retained tunnel close to the goaf to be cut off; the second support part is arranged between the first support part and the mining face, and is used to reinforce the corresponding part of the direct roof of the goaf-retained tunnel located between the first support part and the mining face. Compared with the solution in the related art that uses reserved coal pillars to support the direct roof corresponding to the goaf to be cut, the solution of the present application releases part of the pressure of the rock layer at the top of the goaf to be cut by cutting off the direct roof corresponding to the goaf to be cut, thereby reducing the number and size of the reserved coal pillars supporting the direct roof corresponding to the goaf to be cut, thereby allowing more coal resources to be mined and utilized; and through the first support part and the second support part, the stability of the goaf-side lane is enhanced, thereby ensuring the safety of workers and equipment. Therefore, the technical solution of the present application can effectively solve the problem of waste of coal resources in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A cross-sectional schematic diagram of a partial structure of an embodiment of a tunnel roof cutting support system according to the utility model is shown, wherein the direct roof corresponding to the goaf to be roof cut has been cut off;

[0018] Figure 2 Shows Figure 1 A schematic cross-sectional view of a partial structure of a support matrix of a tunnel top cutting support system;

[0019] Figure 3 Shows Figure 1 A schematic cross-sectional view of a pre-splitting top cutting structure of a tunnel top cutting support system;

[0020] Figure 4 Shows Figure 1A schematic structural diagram of part of the structure of the tunnel roof cutting support system, in which the direct roof corresponding to the goaf to be cut off has not been cut off.

[0021] The above drawings include the following reference numerals:

[0022] a. Mining direction;

[0023] 1. Gob-side entry; 2. Gob area to be cut; 3. Mining surface; 4. Direct roof; 5. Floor; 6. Basic roof;

[0024] 10. Pre-splitting and top cutting structure; 11. Footing part; 12. Clay part; 121. First waterless clay part; 122. Water clay part; 123. Second waterless clay part; 13. Explosive part; 131. Explosives; 132. Detonator;

[0025] 20. First support part; 21. Support base; 211. Support wall; 212. Support column; 2121. Column body; 2122. Fixing part; 213. Connecting part; 2131. Connecting plate; 2132. Plug-in tube; 2133. Mounting hole; 214. Filling part; 215. Current limiting layer; 22. Support anchor rod;

[0026] 30. The second supporting part; 31. Support anchor cable. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0030] like Figures 1 to 4 As shown, the present application provides a tunnel top cutting support system, which is arranged in a goaf-side tunnel 1 and a goaf area 2 to be top cut, and is characterized in that a side of the goaf-side tunnel 1 away from the goaf area 2 to be top cut is a mining face 3, and there is a direct roof 4 above the goaf-side tunnel 1 and the goaf area 2 to be top cut. The embodiment of the tunnel top cutting support system of the present application includes: a pre-splitting top cutting structure 10, a first supporting part 20, and a second supporting part 30; the pre-splitting top cutting structure 10 is arranged at the direct roof 4 corresponding to the goaf area 2 to be top cut, so as to The direct roof 4 corresponding to the goaf 2 is cut off; the first support part 20 is arranged between the goaf-retained tunnel 1 and the goaf 2 to be cut off, and the first support part 20 includes a support base 21 and a support anchor 22 arranged at the upper end of the support base 21, the lower end of the support anchor 22 is connected to the support base 21, and the upper end of the support anchor 22 extends into the direct roof 4 corresponding to the goaf-retained tunnel 1; the second support part 30 is arranged between the first support part 20 and the mining face 3 to support the direct roof 4 corresponding to the goaf-retained tunnel 1.

[0031] By applying the technical solution of this embodiment, the pre-splitting and top-cutting structure 10 is arranged at the direct top 4 corresponding to the goaf 2 to be top-cut, and the pre-splitting and top-cutting structure 10 can cut off the direct top 4 corresponding to the goaf 2 to be top-cut; the first supporting part 20 is arranged between the goaf-retaining tunnel 1 and the goaf 2 to be top-cut, and when the direct top 4 corresponding to the goaf 2 to be top-cut is cut off, this part of the direct top 4 will collapse in the goaf 2 to be top-cut, and the first supporting part 20 can protect the goaf-retaining tunnel 1 to ensure the safety of personnel and equipment working in the goaf-retaining tunnel 1, wherein the first supporting part 20 includes a supporting matrix 21 and a supporting matrix arranged on the supporting matrix. The support anchor 22 at the upper end of 21, the support base 21 is used to stop the rocks formed by the direct roof 4 collapsed in the goaf 2 to be cut off to protect the workers and equipment in the goaf-side tunnel 1, the lower end of the support anchor 22 is connected to the support base 21, the upper end of the support anchor 22 extends into the direct roof 4 corresponding to the goaf-side tunnel 1, the support anchor 22 is used to reinforce the corresponding part of the direct roof 4 of the goaf-side tunnel 1 close to the goaf 2 to be cut off; the second support part 30 is arranged between the first support part 20 and the mining face 3, and is used to reinforce the corresponding part of the direct roof 4 of the goaf-side tunnel 1 located between the first support part 20 and the mining face 3. Compared with the solution of using reserved coal pillars to support the direct roof 4 corresponding to the goaf 2 to be cut in the related art, the solution of this embodiment is applied to release part of the pressure of the top rock layer of the goaf 2 to be cut by cutting off the direct roof 4 corresponding to the goaf 2 to be cut, thereby reducing the number and size of the reserved coal pillars supporting the direct roof 4 corresponding to the goaf 2 to be cut, so that more coal resources can be mined and utilized; and the stability of the goaf-side entry 1 is enhanced by the first support part 20 and the second support part 30, thereby ensuring the safety of the staff and equipment. Therefore, the technical solution of this embodiment can effectively solve the problem of waste of coal resources in the related art.

[0032] It should be noted that if Figure 4As shown, in this field, "mining face" refers to the coal mining working face, which is the working place of underground coal mining and the first production site of coal; the equipment for mining coal mines is usually set at the mining face, and the direction from the mining face to the coal body to be mined is the mining direction, and the space preset at a certain distance from the mining face in the opposite direction to the mining direction is the goaf-retained lane, and the staff and mining equipment are located in the goaf-retained lane; the space preset at a certain distance in the opposite direction to the mining direction at one end of the goaf-retained lane away from the mining face is the goaf area to be cut off; in the relevant technology, in the mining direction, as the mining of the coal body to be mined advances forward, a certain space will be generated behind the mining face, and this part of the space is divided into goaf-retained lane and goaf area to be cut off in the direction opposite to the mining direction. As with other goafs, the top of this part of the space corresponds to the direct roof, and above the direct roof is the basic roof. The direct roof is a rock layer of a certain thickness, which is relatively unstable. One end of the direct roof is suspended in the air, and the other end is supported by the coal body to be mined, thus forming a cantilever beam structure. The direct roof at the suspended end is at risk of collapse, thus causing potential safety hazards; the basic roof is located above the direct roof, which is usually a rock layer with greater thickness and rock strength. It can be suspended above the goaf for a long time without collapsing; in related technologies, there are usually reserved coal pillars in the goaf to be cut off, that is, when the coal body to be mined is mined, the coal body to be mined will not be completely mined out, but a certain amount of coal pillars will be left. The coal pillars are used to support the direct roof corresponding to the goaf to be cut off to prevent sudden collapse of the direct roof.

[0033] In this embodiment, the support matrix 21 includes a plurality of support walls 211 arranged at intervals, and each support wall 211 includes a plurality of support columns 212 arranged at intervals. Specifically, in the mining direction, as the mining of the coal body to be mined advances forward, the first support portion 20 may include a plurality of first support portions 20 arranged at intervals along the mining direction, and each first support portion 20 is located on a side away from the mining face 3 and is a goaf 2 to be top-cut. With such an arrangement, the staff can cut off the direct roof 4 corresponding to the goaf 2 to be top-cut section by section as the mining advances. Each time the direct roof 4 corresponding to the goaf 2 to be top-cut is cut off, there will be a first support portion 20 to stop the collapsed rock; the goaf 2 to be top-cut has two states, the goaf 2 to be top-cut has two states. Figure 4 The first state shown in which the top 4 is not cut off and the Figure 1 In the second state shown, the direct roof 4 is cut off by the pre-splitting cutting structure 10, and the supporting base 21 includes a plurality of supporting walls 211 arranged at intervals along the back-moving direction, and each supporting wall 211 includes a plurality of supporting columns 212 arranged at intervals along a direction perpendicular to the mining direction. The plurality of supporting walls 211 and the plurality of supporting columns 212 in each supporting wall 211 can improve the structural strength of the first supporting part 20, and further ensure the safety of the workers and equipment in the gob-side tunnel 1.

[0034] like Figure 1 as well as Figure 2 As shown, there are multiple support anchors 22, and the multiple support anchors 22 are arranged one by one with the multiple support columns 212. The support base 21 also includes multiple connecting parts 213, and each support anchor 22 is connected to the corresponding support column 212 through a connecting part 213. Specifically, the connecting part 213 is used to connect the support anchor 22 and the support column 212, and the support column 212 provides a supporting foundation for the support anchor 22. The multiple support anchors 22 can all extend into the direct roof 4 corresponding to the gob-side tunnel 1 to reinforce the direct roof 4 of the part of the gob-side tunnel 1 close to the goaf 2 to be cut.

[0035] like Figure 3 As shown, the connection part 213 includes a connection plate 2131 and an inserting tube 2132 arranged on the lower side of the connection plate 2131, the inserting tube 2132 is plugged with the upper end of the support column 212, and a mounting hole 2133 is arranged on the connection plate 2131, and the lower end of the support anchor rod 22 is penetrated through the mounting hole 2133. Specifically, the inserting tube 2132 and the upper end of the support column 212 can be connected by screws or plugged by interference fit, so that the staff can quickly connect the support column 212 with the connection plate 2131, the mounting hole 2133 has an internal thread, and the lower end of the support anchor rod 22 has an external thread matched with the internal thread, so that the staff can quickly connect the support anchor rod 22 with the connection plate 2131, and in addition, the stable connection between the support anchor rod 22 and the connection plate 2131 can also be ensured.

[0036] like Figure 1 As shown, the support base 21 also includes a filling portion 214 disposed between each two adjacent support walls 211. Specifically, the filling portion 214 may be a solid with a certain structural strength. In this embodiment, the filling portion 214 is formed by pouring concrete between two adjacent support walls 211 and waiting for the concrete to solidify, which has the advantages of simple processing, high reliability and low cost.

[0037] like Figure 1 As shown, a limiting flow layer 215 is provided between the supporting wall 211 and the filling part 214. Specifically, in this embodiment, since the filling part 214 is formed by solidifying concrete, when pouring concrete, the concrete is easy to overflow to the outside of the supporting wall 211 and is not conducive to the formation of the filling part 214, a limiting flow layer 215 is provided between the supporting wall 211 and the filling part 214. The limiting flow layer 215 is composed of a steel mesh and a wind tube cloth. The steel mesh provides a supporting matrix for the wind tube cloth. The wind tube cloth is used to stop the concrete from overflowing to the outside of the supporting wall 211. The wind tube cloth has high strength and durability and can resist harsh environmental conditions, such as high temperature, high humidity, chemical corrosion, etc. In addition, the wind tube cloth also has good air permeability and waterproof properties.

[0038] In addition, in this embodiment, the thickness of the filling portion 214 is between 0.8m and 1m. Specifically, the thickness of the filling portion 214 can be 0.8m, 0.85m, 0.9m, 0.95m and 1m. The filling portion 214 that meets the above conditions can, on the one hand, make the first support portion 20 have sufficient structural strength to stop the rock from collapsing in the goaf 2 to be cut after the top is cut, and on the other hand, make the first support portion 20 not too thick to control the transportation cost of concrete.

[0039] In addition, if Figure 1 As shown, in this embodiment, each support column 212 includes a column body 2121 and a fixing portion 2122 disposed at the lower end of the column body 2121 and extending into the bottom plate 5, and the length of the fixing portion 2122 is between 500 mm and 800 mm. Specifically, the length of the fixing portion 2122 can be 500 mm, 563 mm, 625 mm, 707 mm, 772 mm, and 800 mm. By providing the fixing portion 2122, the support column 212 can be stably connected to the bottom plate 5, and thus the first support portion 20 can be stably connected to the bottom plate 5.

[0040] like Figure 1 As shown, there is a basic roof 6 above the direct roof 4, and the second supporting part 30 includes a plurality of support anchor cables 31 arranged at intervals, and the upper ends of the support anchor cables 31 are passed through the direct roof 4 and the basic roof 6. Specifically, the upper ends of the support anchor cables 31 are passed through the direct roof 4 and the basic roof 6, which can further reinforce the direct roof 4 and the basic roof 6 corresponding to the gob-side tunnel retaining 1 to enhance the safety of the gob-side tunnel retaining 1. Under normal circumstances, the thickness of the direct roof 4 is generally between 2m and 5m. The interval between two adjacent supporting anchor cables 31 is between 1000mm and 1200mm, specifically, the interval between two adjacent supporting anchor cables 31 can be 1000mm, 1088mm, 1123mm, 1187mm and 1200mm; the effective anchoring length of the supporting anchor cable 31 is between 3000mm and 4000mm, specifically, the effective anchoring length of the supporting anchor cable 31 can be 3000mm, 3346mm, 3578mm, 3872mm and 4000mm.

[0041] like Figure 3As shown, the pre-splitting and top cutting structure 10 extends in the up-down direction, and the pre-splitting and top cutting structure 10 includes a foot line part 11, a tapping mud part 12 and an explosion part 13. The lower end of the pre-splitting and top cutting structure 10 extends out of the direct top 4, and the upper end of the pre-splitting and top cutting structure 10 is located in the direct top 4. In the direction from bottom to top, the foot line part 11, the tapping mud part 12 and the explosion part 13 are arranged in sequence, and the lower end of the foot line part 11 forms the lower end of the pre-splitting and top cutting structure 10. Specifically, the pre-splitting and top cutting structure 10 includes a detonating wire, which passes through the pre-splitting and top cutting structure 10 from top to bottom, and the lower end of the detonating wire forms the foot line part 11, and the upper end of the detonating wire is connected to the explosion part 13. The staff can detonate the explosion part 13 by operating the foot line part 11, and then use the explosion energy of the explosion part 13 to cut off the direct top 4 corresponding to the goaf 2 to be top cut. Among them, the explosion part 13 is composed of a multi-stage explosion sub-unit arranged in the up-down direction, each explosion sub-unit is connected to the detonating line, so that the multi-stage explosion sub-units can explode at the same time. On the one hand, the multi-stage explosion sub-units can enable the staff to accurately control the explosion position, and on the other hand, even if some explosion sub-units are not detonated, it does not affect the overall cutting effect. The explosion sub-units include detonators 132 and explosives 131. In addition, the gun mud part 12 includes a first waterless gun mud part 121, a water gun mud part 122 and a second waterless gun mud part 123 arranged in sequence from bottom to top. The length of the first waterless gun mud part 121 is greater than that of the second waterless gun mud part 123. The second waterless gun mud part 123 is used to separate the water gun mud part 122 from the explosion part 13. The water gun mud part 122 includes water gun mud, which is used for blasting dust removal, and the first waterless gun mud part 121 is used to seal the water gun mud part 122, the second waterless gun mud part 123 and the explosion part 13.

[0042] In this embodiment, the distance between the pre-splitting and top cutting structure 10 and the mining face 3 in the mining direction a is between 50m and 100m. Specifically, the distance between the pre-splitting and top cutting structure 10 and the mining face 3 in the mining direction a can be 50m, 67m, 74m, 82m, 90m, 96m and 100m. With this arrangement, the energy released by the pre-splitting and top cutting structure 10 during top cutting can interfere with the direct roof 4 corresponding to the gob-side tunnel 1 as little as possible; the distance between the explosive part 13 and the lower surface of the direct roof 4 in the up and down directions is between 6m and 7m. With this arrangement, the explosive part 13 can cut off enough direct roof 4 without causing some rocks on the direct roof 4 to be unstable but not collapsed.

[0043] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tunnel top cutting support system, arranged in a tunnel along the goaf (1) and a goaf area to be top cut (2), characterized in that: The side of the gob-side entry (1) away from the gob area (2) to be cut off is a mining face (3), and there is a direct roof (4) above the gob-side entry (1) and the gob area (2) to be cut off. The roadway roof cutting support system comprises: A pre-splitting and top-cutting structure (10) is arranged at the direct top (4) corresponding to the goaf area (2) to be top-cut, so as to cut off the direct top (4) corresponding to the goaf area (2) to be top-cut; A first support part (20) is arranged between the gob-side entry retaining (1) and the gob area (2) to be cut, the first support part (20) comprising a support base (21) and a support anchor (22) arranged at the upper end of the support base (21), the lower end of the support anchor (22) is connected to the support base (21), and the upper end of the support anchor (22) extends into the direct roof (4) corresponding to the gob-side entry retaining (1); The second supporting part (30) is arranged between the first supporting part (20) and the mining surface (3) to support the direct roof (4) corresponding to the gob-side entry retaining (1).

2. The tunnel cutting support system according to claim 1, characterized in that: The support base (21) comprises a plurality of support walls (211) arranged at intervals, and each of the support walls (211) comprises a plurality of support columns (212) arranged at intervals.

3. The tunnel top cutting support system according to claim 2, characterized in that: There are a plurality of support anchor rods (22), and the plurality of support anchor rods (22) are arranged in one-to-one correspondence with the plurality of support columns (212). The support base (21) also includes a plurality of connecting parts (213), and each support anchor rod (22) is connected to the corresponding support column (212) via one of the connecting parts (213).

4. The tunnel top cutting support system according to claim 3, characterized in that: The connecting portion (213) comprises a connecting plate (2131) and an inserting tube (2132) arranged on the lower side of the connecting plate (2131), the inserting tube (2132) is plugged into and matched with the upper end of the supporting column (212), and a mounting hole (2133) is arranged on the connecting plate (2131), and the lower end of the supporting anchor rod (22) is inserted into the mounting hole (2133).

5. The tunnel top cutting support system according to any one of claims 2 to 4, characterized in that: The support base (21) further comprises a filling portion (214) arranged between every two adjacent support walls (211).

6. The tunnel top cutting support system according to claim 5, characterized in that: A finite flow layer (215) is provided between the supporting wall (211) and the filling portion (214).

7. The tunnel top cutting support system according to claim 5, characterized in that: The thickness of the filling portion (214) is between 0.8 m and 1 m; and / or, At least one of the support columns (212) comprises a column body (2121) and a fixing portion (2122) arranged at the lower end of the column body (2121) and extending into the bottom plate (5); the length of the fixing portion (2122) is between 500 mm and 800 mm.

8. The tunnel top cutting support system according to any one of claims 1 to 4, characterized in that: A basic roof (6) is provided above the direct roof (4), and the second supporting portion (30) comprises a plurality of supporting anchor cables (31) arranged at intervals, wherein the upper ends of the supporting anchor cables (31) are passed through the direct roof (4) and the basic roof (6).

9. The tunnel top cutting support system according to any one of claims 1 to 4, characterized in that: The pre-splitting top cutting structure (10) extends in the up-down direction, and comprises a foot line portion (11), a tapping mud portion (12) and an explosion portion (13). The lower end of the pre-splitting top cutting structure (10) extends out of the direct top (4), and the upper end of the pre-splitting top cutting structure (10) is located in the direct top (4). In the direction from bottom to top, the foot line portion (11), the tapping mud portion (12) and the explosion portion (13) are arranged in sequence, and the lower end of the foot line portion (11) forms the lower end of the pre-splitting top cutting structure (10).

10. The tunnel top cutting support system according to claim 9, characterized in that: The distance between the pre-splitting and cutting top structure (10) and the mining surface (3) in the mining direction (a) is between 50m and 100m; and / or, The distance between the explosion part (13) and the lower surface of the direct top (4) in the up-down direction is between 6m and 7m.

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