Construction method of underground inclined slip coal hole

Abstract

The invention discloses a construction method of an underground inclined slip coal hole, relates to the technical field of coal mining, and mainly aims to solve the problems of high construction difficulty and high risk when the inclined slip coal hole is excavated by adopting an explosive blasting mode underground in the prior art. Designing construction related parameters of the inclined slip coal hole based on the position relation; the construction related parameters comprise an upper opening position, an upper opening aperture, a lower opening position, a lower opening aperture and an inclination angle; fixed point holes are designed based on the construction related parameters, and drill bits corresponding to the fixed point holes are adopted to conduct drilling construction operation according to a preset drilling sequence; performing secondary reaming operation on the fixed-point hole to enable the fixed-point hole to be completely expanded to obtain an inclined funnel-shaped through hole; and carrying out support guniting treatment on the inclined funnel-shaped through hole to obtain a target inclined slip coal hole.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, in particular to a construction method of an underground inclined coal chute. Background Art

[0002] During the coal mining process, in order to improve the transportation efficiency of coal underground, inclined coal chutes are drilled between tunnels located above and below each other, and the coal's own gravity is used to transport the coal directly from a high place to the transportation equipment below.

[0003] At present, dynamite blasting is used to construct inclined coal chutes. However, due to the influence of gas concentration underground in coal mines, the use of dynamite blasting often brings high construction difficulty and construction risk. In severe cases, it directly threatens the personal safety of construction workers. Therefore, there is an urgent need for a safe, reliable and operable underground inclined coal chute construction method. Summary of the Invention

[0004] In view of this, the present invention provides an underground inclined coal chute construction method, the main purpose of which is to solve the problems of high construction difficulty and high risk when excavating inclined coal chute by explosive blasting in the existing underground.

[0005] According to one aspect of the present invention, a method for constructing an underground inclined coal chute is provided, comprising:

[0006] Obtaining the positional relationship between the upper and lower roadways to be constructed, and designing construction-related parameters of the inclined coal chute based on the positional relationship; the construction-related parameters include the upper opening position, upper opening diameter, lower opening position, lower opening diameter, and inclination angle;

[0007] Designing fixed-point holes based on the construction-related parameters, and performing drilling operations using a drill bit corresponding to the fixed-point holes in a preset drilling sequence;

[0008] Performing a secondary hole expansion operation on the fixed point hole to expand all the fixed point holes to obtain an oblique funnel-shaped through hole;

[0009] The oblique funnel-shaped through hole is subjected to support grouting treatment to obtain a target oblique coal chute.

[0010] Furthermore, the designing of fixed-point holes based on the construction-related parameters includes:

[0011] Planning an inclined funnel-shaped drilling area of ​​an inclined coal chute to be constructed based on the upper opening position, the upper opening diameter, the lower opening position, the lower opening diameter, and the inclination angle;

[0012] Dividing the oblique funnel-shaped drilling area into a through-hole area and a non-through-hole area; the non-through-hole area is located above the through-hole area;

[0013] The fixed-point holes with the same aperture are respectively designed in the through-hole area and the non-through-hole area, and the fixed-point holes include fixed-point non-through-holes and fixed-point through-holes.

[0014] Furthermore, before performing the drilling operation using the drill bit corresponding to the fixed point hole according to a preset drilling sequence, the method further includes:

[0015] Determine the boundary holes from all the fixed-point holes;

[0016] Drilling operations are performed on each of the boundary holes, and the position and angle of each of the boundary holes are adjusted by measuring and setting out.

[0017] Furthermore, the drilling operation is performed using a drill bit corresponding to the fixed point hole in accordance with a preset drilling sequence, including:

[0018] Perform drilling operations on the fixed-point non-through holes corresponding to the non-through hole area according to the drilling sequence;

[0019] Drilling operations are performed on the fixed-point through holes corresponding to the through hole area according to the drilling sequence.

[0020] Furthermore, the drilling operation is performed on the fixed-point non-through holes corresponding to the non-through hole area according to the drilling sequence, including:

[0021] Determine the row number of the non-through hole to be constructed from top to bottom;

[0022] Determining the target position of the fixed-point non-through hole to be constructed in order from left to right or from right to left based on the row number;

[0023] The designed length and inclination of the fixed-point non-through hole to be constructed are obtained, and a drilling construction operation is performed on the fixed-point non-through hole to be constructed based on the designed length, the inclination and the target position.

[0024] Furthermore, the drilling operation of the fixed-point through holes corresponding to the through hole area according to the drilling sequence includes:

[0025] Determine the row number of the fixed-point through hole to be constructed in order from top to bottom;

[0026] Determining the target position of the fixed-point through hole to be constructed based on the row number in a left-to-right or right-to-left order;

[0027] The inclination angle of the fixed-point through hole to be constructed is obtained, and a drilling operation is performed on the fixed-point through hole to be constructed based on the inclination angle and the target position.

[0028] Furthermore, the secondary expansion operation is performed on the fixed point holes to expand all the fixed point holes to obtain oblique funnel-shaped through holes, including:

[0029] Selecting a first reaming drill bit having a diameter larger than the fixed hole, and performing a reaming operation using the first reaming drill bit according to a preset reaming sequence to obtain a reaming result;

[0030] A second reaming drill bit having a diameter larger than that of the first reaming drill bit is selected, and based on the result of the first reaming, a secondary reaming operation is performed using the second reaming drill bit in a preset reaming sequence to obtain the oblique funnel-shaped through hole.

[0031] Furthermore, during the secondary hole expansion operation, the positional relationship between the holes is a tangent relationship.

[0032] Furthermore, the inclination angle of the fixed-point non-through hole is -60°; the inclination angle of the fixed-point through hole is -50°.

[0033] Furthermore, during the drilling operation, the drilling rig starts construction from the upper opening position, and the tunnel at the lower opening position is compacted and protected with road timber.

[0034] By means of the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

[0035] The present invention provides a method for constructing an underground inclined coal chute. Compared with existing technologies, the present invention obtains the positional relationship between the upper and lower tunnels to be constructed and designs the construction-related parameters of the inclined coal chute based on this positional relationship. The construction-related parameters include the upper opening position, upper opening diameter, lower opening position, lower opening diameter, and inclination angle. Based on the construction-related parameters, a fixed-point hole is designed and drilled using a drill bit corresponding to the fixed-point hole in a preset drilling sequence. The fixed-point hole is then expanded a second time to fully expand the fixed-point hole, resulting in an inclined funnel-shaped through hole. The inclined funnel-shaped through hole is then subjected to support grouting to obtain the target inclined coal chute. This method enables the excavation of an underground inclined coal chute using only a drilling rig. Because the method of the present invention does not employ blasting, it reduces the safety hazards associated with excavating an underground inclined coal chute, and is safe, reliable, and operational.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0038] Figure 1 A schematic diagram showing a process of a construction method of an underground inclined coal chute provided by an embodiment of the present invention is shown;

[0039] Figure 2 A schematic diagram of the planar layout of the upper opening position after secondary hole expansion provided by an embodiment of the present invention is shown;

[0040] Figure 3 A schematic diagram showing a process flow of another underground inclined coal chute construction method provided by an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of a drilling area division result provided by an embodiment of the present invention is shown;

[0042] Figure 5 A schematic flow chart of another underground inclined coal chute construction method provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] The embodiment of the present invention provides a construction method for an underground inclined coal chute, such as Figure 1 As shown, the method includes:

[0045] 101. Obtain the positional relationship between the upper and lower roadways to be constructed, and design construction-related parameters of the inclined coal chute based on the positional relationship; the construction-related parameters include the upper opening position, upper opening diameter, lower opening position, lower opening diameter, and inclination angle;

[0046] In an embodiment of the present invention, the positional relationship between the upper and lower tunnels to be constructed is obtained. Taking a certain underground coal mine as an example, when the west wing main tunnel of the No. 31 coal mine is excavated, the belt is arranged in the main transport tunnel of the west wing of the 31 coal mine. The main transport head chamber of the west wing of the 31 coal mine is in an upper and lower relationship with the main transport tunnel of the 31 coal mine, and the position is deviated. This situation meets the conditions for excavating an inclined coal chute. Therefore, the construction-related parameters of the inclined coal chute can be designed based on the above positional relationship; wherein, the construction-related parameters include the upper mouth position, the upper mouth diameter, the lower mouth position, the lower mouth diameter and the inclination angle. For the above-mentioned No. 31 coal mine, the construction-related parameters designed in the embodiment of the present invention are that the upper mouth position is at the head chamber of the west wing of the 31 coal mine, the upper mouth diameter is designed to be 3m in diameter, the lower mouth position is at the top of the lower 31 coal main transport tunnel, 0.5-1m away from the center line, the lower mouth diameter is designed to be 1.95m in diameter, and the overall inclination angle is designed to be 60°. The embodiment of the present invention does not make specific limitations.

[0047] 102. Designing fixed-point holes based on the construction-related parameters, and performing drilling operations using a drill bit corresponding to the fixed-point holes in a preset drilling sequence;

[0048] In this embodiment of the present invention, after designing the relevant construction parameters, it is also necessary to design fixed-point holes based on the designed construction parameters. The fixed-point holes are a series of non-tangential holes with equal spacing. For example, for the aforementioned underground coal mine, the fixed-point holes for coal number 31 are designed to have a diameter of 75 mm. Therefore, during construction, the drilling rig selects a 75 mm drill bit corresponding to the fixed-point holes and performs the drilling operation according to a pre-set drilling sequence.

[0049] It should be noted that during the drilling operation, the drilling rig begins at the upper opening, and the tunnel at the lower opening is compacted and protected with tamping timber. Since drilling rigs in the art generally drill from bottom to top, the top-to-bottom drilling operation in this embodiment is reverse construction, requiring the drilling rig to be fixed in the upper tunnel.

[0050] 103. Perform a secondary hole expansion operation on the fixed-point hole to expand all the fixed-point holes to obtain an oblique funnel-shaped through hole;

[0051] In an embodiment of the present invention, after all the fixed holes are constructed, it is necessary to perform a secondary hole expansion operation on the fixed holes, that is, a drill bit with a larger diameter than the fixed hole is used to perform drilling construction to increase the diameter of the hole. Specifically, a first hole expansion drill bit larger than the diameter of the fixed hole is selected. In this embodiment, taking the above-mentioned underground coal mine as an example, a first hole expansion drill bit with a diameter of 153 mm is selected for coal No. 31, and then the first hole expansion drill bit is used to perform a hole expansion operation according to a preset hole expansion sequence to obtain a primary hole expansion result; then, a second hole expansion drill bit larger than the diameter of the first hole expansion drill bit is selected. In this embodiment, taking the above-mentioned underground coal mine as an example, a second hole expansion drill bit with a diameter of 193 mm is selected for coal No. 31, and then based on the said primary hole expansion result, the second hole expansion drill bit is used to perform a secondary hole expansion operation according to a preset hole expansion sequence to obtain the oblique funnel-shaped through hole.

[0052] It should be noted that during the above-mentioned secondary hole expansion operation, the positional relationship between the holes is a tangent relationship. The schematic diagram of the plane layout at the upper mouth position after the secondary hole expansion is as follows: Figure 2 shown.

[0053] 104. Perform support grouting treatment on the inclined funnel-shaped through hole to obtain a target inclined coal chute.

[0054] In the embodiment of the present invention, to enhance the stability of the inclined coal chute, after obtaining the inclined funnel-shaped through hole, it is necessary to perform support grouting on the inclined funnel-shaped through hole to obtain the target inclined coal chute. The support grouting treatment typically employs bolt support and shotcrete support, and is not specifically limited in the embodiment of the present invention.

[0055] An embodiment of the present invention provides a method for constructing an underground inclined coal chute. Compared with the prior art, the present invention obtains the positional relationship between the upper and lower tunnels to be constructed and designs the construction-related parameters of the inclined coal chute based on the positional relationship; the construction-related parameters include the upper opening position, upper opening diameter, lower opening position, lower opening diameter, and inclination angle; designs a fixed-point hole based on the construction-related parameters, and performs drilling operations using a drill bit corresponding to the fixed-point hole in a preset drilling sequence; performs a secondary hole expansion operation on the fixed-point hole to fully expand the fixed-point hole to obtain an inclined funnel-shaped through hole; and performs support grouting on the inclined funnel-shaped through hole to obtain the target inclined coal chute. This method enables the excavation of an underground inclined coal chute using only a drilling rig. Because the method of the present invention does not employ blasting, it reduces the safety hazards associated with excavating an inclined coal chute underground, and is safe, reliable, and operational.

[0056] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to improve the operability of the construction and speed up the construction efficiency, another underground inclined coal chute construction method is provided, such as Figure 3As shown, the steps of designing fixed-point holes based on the construction-related parameters include:

[0057] 201. Planning an oblique funnel-shaped drilling area of ​​a to-be-constructed oblique coal chute based on the upper opening position, the upper opening diameter, the lower opening position, the lower opening diameter, and the inclination angle;

[0058] In the embodiment of the present invention, the inclined funnel-shaped drilling area of ​​the inclined coal chute to be constructed is planned based on the upper mouth position, the upper mouth diameter, the lower mouth position, the lower mouth diameter and the inclination angle. Taking the above-mentioned underground coal mine as an example, the planning result of the inclined funnel-shaped drilling area between the main transport head chamber of the west wing of the No. 31 coal and the main transport tunnel of the No. 31 coal is as follows: Figure 4 shown.

[0059] 202. Divide the oblique funnel-shaped drilling area into a through-hole area and a non-through-hole area; the non-through-hole area is located above the through-hole area;

[0060] In the embodiment of the present invention, the planned oblique funnel-shaped drilling area is divided into a through-hole area and a non-through-hole area, such as Figure 2 and Figure 4 As shown, the area where the red hole is located is the through-hole area, and the area where the purple hole is located is the non-through-hole area. The non-through-hole area is located above the through-hole area. During the specific construction, it is necessary to drill the non-through-hole area located above first, and then drill the through-hole area located below.

[0061] 203. Design the fixed-point holes with the same aperture in the through-hole area and the non-through-hole area, respectively. The fixed-point holes include fixed-point non-through-holes and fixed-point through-holes.

[0062] In the embodiment of the present invention, after the through hole area and the non-through hole area are divided, fixed-point holes of the same aperture are designed in the through hole area and the non-through hole area. Among them, the fixed-point holes in the through hole area are designed as fixed-point through holes, and the fixed-point holes in the non-through hole area are designed as fixed-point non-through holes. Figure 4 As shown, the fixed-point holes in the purple part are designed as fixed-point non-through holes, and the fixed-point holes in the red part are designed as fixed-point through holes.

[0063] It should be noted that the inclination angle of the fixed-point non-through hole is -60°, that is, Figure 4 The inclination angle of the fixed-point non-through hole in the purple part is -60°; the inclination angle of the fixed-point through hole is -50°, that is, Figure 4 The inclination angle of the fixed-point through hole in the red part is -50°.

[0064] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to improve the controllability and efficiency of the construction, another underground inclined coal chute construction method is provided, such as Figure 5As shown, before the step of using the drill bit corresponding to the fixed hole to perform the drilling construction operation according to the preset drilling sequence, the method further includes:

[0065] 301. Determine boundary holes from all fixed-point holes;

[0066] 302. Drill each of the boundary holes and adjust the position and angle of each boundary hole by measuring and setting out.

[0067] In an embodiment of the present invention, to ensure that the position and angle of the oblique coal chute are not deviated after final drilling, boundary holes are first determined from all fixed-point holes. Boundary holes are the outermost ring of holes within the oblique funnel-shaped drilling area. Drilling operations are then performed on each boundary hole separately. This process is a decentralized construction process. During the drilling of the boundary holes, the position and angle of each boundary hole must be adjusted using measurement and layout to ensure that the adjusted position and angle are consistent with the corresponding position and angle during design. Once the position and angle of the boundary holes are determined, the overall position and angle of the oblique coal chute will no longer deviate.

[0068] The step of using a drill bit corresponding to the fixed point hole to perform a drilling operation in a preset drilling sequence includes:

[0069] 303. Perform drilling operations on the fixed-point non-through holes corresponding to the non-through hole area according to the drilling sequence;

[0070] In the embodiment of the present invention, the row number of the non-through hole to be constructed is first determined in order from top to bottom; Figure 4 As shown, construction starts from the first row in the purple area, and after the first row is completed, the second row is constructed, and so on, until all the fixed-point non-through holes in the purple area are constructed. Then, based on the number of rows, the target position of the fixed-point non-through holes to be constructed is determined in order from left to right or from right to left; that is, when constructing the fixed-point non-through holes in the same row, the construction operations are performed one by one in order from left to right, or in order from right to left. During the specific construction, it is also necessary to obtain the design length and inclination angle of the fixed-point non-through holes to be constructed, and perform drilling construction operations on the fixed-point non-through holes to be constructed based on the design length, the inclination angle and the target position. As Figure 4 As shown, the design lengths of the fixed-point non-through holes in the purple area become shorter from top to bottom, and the inclination angles are all -60°, which is not specifically limited in the embodiment of the present invention.

[0071] 304 . Perform drilling operations on the fixed-point through holes corresponding to the through hole area according to the drilling sequence.

[0072] In the embodiment of the present invention, the row number of the fixed-point through hole to be constructed is first determined in order from top to bottom; Figure 4 As shown, construction starts from the first row in the red area, and after the first row is completed, the second row is constructed, and so on, until all the fixed through holes in the red area are constructed. Then, based on the number of rows, the target position of the fixed through holes to be constructed is determined in order from left to right or from right to left; that is, when constructing the fixed through holes in the same row, the construction operations are performed one by one in order from left to right, or in order from right to left. During the specific construction, it is also necessary to obtain the inclination angle of the fixed through hole to be constructed, and perform drilling construction operations on the fixed through hole to be constructed based on the inclination angle and the target position. As Figure 4 As shown, the design length of the fixed-point through holes in the red area is determined by the upper and lower opening positions. During the drilling construction, drilling is performed until the holes are connected. The inclination angle of each fixed-point through hole is -50°, and this embodiment of the present invention does not make any specific limitation.

[0073] It should be noted that the inclination angles of the fixed-point non-through holes and the fixed-point through holes in step 303 and step 304 can be appropriately adjusted according to actual engineering conditions, and are not specifically limited in the embodiment of the present invention.

[0074] An embodiment of the present invention provides a method for constructing an underground inclined coal chute. Compared with the prior art, the present invention obtains the positional relationship between the upper and lower tunnels to be constructed and designs the construction-related parameters of the inclined coal chute based on the positional relationship; the construction-related parameters include the upper opening position, upper opening diameter, lower opening position, lower opening diameter, and inclination angle; designs a fixed-point hole based on the construction-related parameters, and performs drilling operations using a drill bit corresponding to the fixed-point hole in a preset drilling sequence; performs a secondary hole expansion operation on the fixed-point hole to fully expand the fixed-point hole to obtain an inclined funnel-shaped through hole; and performs support grouting on the inclined funnel-shaped through hole to obtain the target inclined coal chute. This method enables the excavation of an underground inclined coal chute using only a drilling rig. Because the method of the present invention does not employ blasting, it reduces the safety hazards associated with excavating an inclined coal chute underground, and is safe, reliable, and operational.

[0075] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for constructing an underground inclined coal chute, characterized in that: include: Obtaining the positional relationship between the upper and lower roadways to be constructed, and designing construction-related parameters of the inclined coal chute based on the positional relationship; the construction-related parameters include the upper opening position, upper opening diameter, lower opening position, lower opening diameter, and inclination angle; Designing fixed-point holes based on the construction-related parameters, and performing drilling operations using a drill bit corresponding to the fixed-point holes in a preset drilling sequence; Performing a secondary hole expansion operation on the fixed point hole to expand all the fixed point holes to obtain an oblique funnel-shaped through hole; The oblique funnel-shaped through hole is subjected to support grouting treatment to obtain a target oblique coal chute.

2. The method according to claim 1, characterized in that The designing of fixed-point holes based on the construction-related parameters includes: Planning an inclined funnel-shaped drilling area of ​​an inclined coal chute to be constructed based on the upper opening position, the upper opening diameter, the lower opening position, the lower opening diameter, and the inclination angle; Dividing the oblique funnel-shaped drilling area into a through-hole area and a non-through-hole area; the non-through-hole area is located above the through-hole area; The fixed-point holes with the same aperture are respectively designed in the through-hole area and the non-through-hole area, and the fixed-point holes include fixed-point non-through-holes and fixed-point through-holes.

3. The method according to claim 2, characterized in that Before performing the drilling operation using the drill bit corresponding to the fixed point hole according to a preset drilling sequence, the method further includes: Determine the boundary holes from all the fixed-point holes; Drilling operations are performed on each of the boundary holes, and the position and angle of each of the boundary holes are adjusted by measuring and setting out.

4. The method according to claim 2, characterized in that The drilling operation is performed using a drill bit corresponding to the fixed point hole according to a preset drilling sequence, including: Perform drilling operations on the fixed-point non-through holes corresponding to the non-through hole area according to the drilling sequence; Drilling operations are performed on the fixed-point through holes corresponding to the through hole area according to the drilling sequence.

5. The method according to claim 4, characterized in that The drilling operation of the fixed-point non-through holes corresponding to the non-through hole area according to the drilling sequence includes: Determine the row number of the non-through hole to be constructed from top to bottom; Determining the target position of the fixed-point non-through hole to be constructed in order from left to right or from right to left based on the row number; The designed length and inclination of the fixed-point non-through hole to be constructed are obtained, and a drilling construction operation is performed on the fixed-point non-through hole to be constructed based on the designed length, the inclination and the target position.

6. The method according to claim 4, characterized in that The drilling operation of the fixed-point through holes corresponding to the through hole area according to the drilling sequence includes: Determine the row number of the fixed-point through hole to be constructed in order from top to bottom; Determining the target position of the fixed-point through hole to be constructed based on the row number in a left-to-right or right-to-left order; The inclination angle of the fixed-point through hole to be constructed is obtained, and a drilling operation is performed on the fixed-point through hole to be constructed based on the inclination angle and the target position.

7. The method according to claim 1, characterized in that The secondary expansion operation is performed on the fixed point hole to expand all the fixed point holes to obtain an oblique funnel-shaped through hole, including: Selecting a first reaming drill bit having a diameter larger than the fixed hole, and performing a reaming operation using the first reaming drill bit according to a preset reaming sequence to obtain a reaming result; A second reaming drill bit having a diameter larger than that of the first reaming drill bit is selected, and based on the result of the first reaming, a secondary reaming operation is performed using the second reaming drill bit in a preset reaming sequence to obtain the oblique funnel-shaped through hole.

8. The method according to claim 7, characterized in that During the secondary hole expansion operation, the positional relationship between the holes is a tangent relationship.

9. The method according to any one of claims 2 to 8, characterized in that The inclination angle of the fixed-point non-through hole is -60°; The inclination angle of the fixed-point through hole is -50°.

10. The method according to any one of claims 1 to 8, characterized in that During the drilling operation, the drilling rig starts construction from the upper opening position, and the tunnel at the lower opening position is compacted and protected with road timber.

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