Mine underground draw shaft extending method

Abstract

The invention belongs to the technical field of mine underground construction, and relates to a mine underground draw shaft extension method. An original draw shaft is arranged between an original layered draw shaft chamber and a transportation middle section; an extension draw shaft is arranged between the original layered new draw shaft chamber and the extension layered draw shaft chamber; the inclined draw shaft is arranged between the original layer new draw shaft chamber and the original draw shaft in a penetrating mode, and the inclination angle of the inclined draw shaft is larger than the repose angle of an ore pile; the method comprises the specific steps that firstly, an extension layered draw shaft chamber and an original layered new draw shaft chamber are excavated; secondly, an inclined draw shaft is constructed from an original layered new draw shaft chamber to an original draw shaft; and thirdly, after the inclined draw shaft is communicated with the original draw shaft, construction is organized, and the extending draw shaft is completed. By adopting the draw shaft extending method, the construction period is short, the influence on the normal use of the transportation roadway and the original draw shaft is small, and the production efficiency is improved; and the construction cost is reduced, and potential safety hazards possibly caused by the fact that personnel and equipment operate right above the original draw shaft are avoided.

Description

Technical Field

[0001] This invention relates to the field of underground mining construction technology, and in particular to a method for extending underground mine ore passes. Background Technology

[0002] For mines operating underground in gently dipping ore bodies, underground mine chutes need to be constructed within a certain transportation range of the intermediate mineral resources. This allows the ore to be transported by gravity from one horizontal roadway to another lower horizontal roadway (transport roadway), achieving the purpose of ore transfer. However, during the transition from mining the first intermediate mineral resource to the next, the existing chutes, located at varying elevations or levels, often fail to meet the optimal transportation distance, leading to reduced production efficiency and increased costs. Furthermore, the service area of ​​the new transportation chutes may not fully cover the peripheral ore bodies of the previous intermediate section.

[0003] The above problems can be solved by adding new ore passes or extending existing ore passes using raise shafts in areas that meet transportation needs. For example, some mining companies add a new ore pass within a suitable transportation range to solve transportation efficiency issues; others use raise shafts to construct layers above existing ore passes, extending them upwards to increase the vertical service range of the ore passes.

[0004] However, both of these options require significant investment and have long construction periods. The construction of the new ore pass requires long-term occupation of the transport roadway, impacting its use and reducing production efficiency. Similarly, extending the ore pass upwards using a raise boring machine requires suspending the original ore pass, also impacting production and reducing efficiency. Furthermore, 3-meter diameter raise boring machines are expensive (equipment costs nearly 6 million yuan), resulting in high investment costs. Using a 1.2-meter raise boring machine requires a complex and safe manual cleaning process, which the industry has gradually phased out, and this technology also has the problem of long production disruption cycles. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for extending underground mine ore passes. This method solves the problems of existing ore pass extension methods, which, while enabling underground ore passes to meet new haulage distance requirements and service ranges, require significant cost investment, have long construction periods, and also affect the use of transport roadways or existing ore passes, thus reducing production efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides the following core technical solution: a method for extending an underground ore pass in a mine, comprising an original stratification section, a new original stratification section, a transport roadway, and an extension stratification; the original stratification section is provided with an original ore pass chamber, the transport roadway is provided with a transport section, and an original ore pass is provided between the original stratification pass chamber and the transport section; the new original stratification section is provided with a new original ore pass chamber, the extension stratification is located above the new original stratification section, the extension stratification is provided with an extension ore pass chamber, an extension ore pass is provided between the new original ore pass chamber and the extension ore pass chamber, and an inclined ore pass is also provided, the inclined ore pass being continuously provided between the new original ore pass chamber and the original ore pass, the inclination angle of the inclined ore pass being greater than the angle of repose of the ore pile; the specific construction steps are as follows:

[0007] The first step is to excavate and extend the layered chute chambers and the original layered new chute chambers;

[0008] The second step is to construct an inclined chute from the original layered new chute chamber to the original chute.

[0009] The third step is to connect the inclined chute with the original chute and then organize construction to complete the extension chute.

[0010] Furthermore, based on the aforementioned core technical solution, in the first step, after the excavation of the original layered new chute chamber and the extended layered chute chamber is completed, anchor mesh shotcrete support is carried out.

[0011] Furthermore, based on the aforementioned core technical solution, in the second step, the cross-section of the inclined chute is 2m×2m, the inclination angle is 55 degrees, and the depth is 6-8 meters. Furthermore, the inclined chute is excavated manually in stages, with the specific steps as follows: First, the material level of the original chute is filled to 2 meters above the pre-connection position of the inclined chute before construction begins; then, construction is stopped before the inclined chute and the original chute are connected, and the material level of the original chute is lowered to 2 meters below the pre-connection position before construction continues.

[0012] Furthermore, based on the aforementioned core technical solution, in the third step, before extending the ore pass, the ore in the original ore pass is filled to the opening of the inclined ore pass.

[0013] Furthermore, based on the aforementioned core technical solution, in the third step, the construction method for extending the ore pass is to adopt a one-time well-forming blasting method; further, the specific steps of the one-time well-forming blasting method are as follows: First, 19 one-time well-forming holes are constructed from the original layered new ore pass chamber upwards. The well-forming holes are vertical holes with a diameter of 80mm-110mm, and the depth of the well-forming holes is the same as the extension layer height. The well-forming holes are arranged within a 2.5m*2.5m rectangular area; then, explosives are loaded into the well-forming holes, and digital electronic detonators are used for inter-hole delayed blasting to form the well.

[0014] Furthermore, based on the above core technical solution, a concrete retaining wall with a height of 70cm and a width of 60cm is set at the wellhead connecting the extended layered chute chamber and the extended chute.

[0015] Furthermore, based on the aforementioned core technical solution, a reinforced concrete sealing wall with a thickness of 60cm and a strength of C20 is installed 7m outward from the connecting wellhead of the original layered new chute chamber and the inclined chute.

[0016] Compared with existing technologies, the technical advantages of this underground ore pass extension method are as follows: It not only solves the problems of insufficient service range of the ore pass in terms of elevation and horizontality and inability to meet haulage distance requirements when connecting two intermediate sections of underground mining in gently dipping ore bodies; the method has a short construction period, does not require long-term disruption to normal production activities, has minimal impact on the normal use of transport roadways and the original ore pass, and improves production efficiency; it also saves construction costs, reduces construction expenses, and avoids potential safety hazards caused by personnel and equipment working directly above the original ore pass; and it enables rapid completion of the ore pass extension project, with higher safety. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention, constitute a part of this application:

[0018] Figure 1 This is a plan view of Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram showing the arrangement of the wellbore holes in Embodiment 1 of the present invention.

[0020] In the diagram: 1. Original layered middle section; 2. Original layered new middle section; 3. Transport roadway; 4. Extended layer; 5. Original layered chute chamber; 6. Transport middle section; 7. Original chute; 8. Original layered new chute chamber; 9. Extended layered chute chamber; 10. Extended chute; 11. Inclined chute. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Definition of noun:

[0023] "Middle section" is a mining term that refers to several horizontal strips perpendicular to the strike of the ore body, which are divided into sections based on the dip direction of the ore body during the mining process.

[0024] "Original stratified section" refers to an existing section in a mine, originally used for ore transportation and the movement of personnel and materials. When the ore body is further mined, it may be necessary to carry out stratified mining above or below the original section. At this time, the original section may need to be modified, such as removing or rearranging transportation facilities (such as tracks and overhead lines) to facilitate new mining operations. During the modification period, the original section may temporarily lose its transportation function as space and access need to be made for the new mining activities.

[0025] "New intermediate section" refers to a new intermediate section that may need to be built to continue ore transportation and mining operations when the original intermediate section loses its transportation function due to renovation. The new intermediate section may be achieved by extending the existing shaft or excavating a new shaft, so that the ore can be transported through the new intermediate section without affecting the mining progress.

[0026] Example 1:

[0027] like Figure 1 and Figure 2 As shown, a method for extending an underground ore pass in a mine includes an original stratification section 1, an original stratification new stratification section 2, a transport roadway 3, and an extension stratification section 4. The original stratification section 1 is equipped with an original stratification ore pass chamber 5, the transport roadway 3 is equipped with a transport roadway section 6, and an original ore pass 7 is located between the original stratification ore pass chamber 5 and the transport roadway section 6. The original stratification new stratification section 2 is equipped with an original stratification new ore pass chamber 8. The extension stratification section 4 is located above the original stratification new stratification section 2 and is equipped with an extension stratification ore pass chamber 9. An extension ore pass 10 is located between the original stratification new ore pass chamber 8 and the extension stratification ore pass chamber 9. An inclined ore pass 11 is also provided, which runs through the original stratification new ore pass chamber 8 and the original ore pass 7. The inclination angle of the inclined ore pass 11 is greater than the angle of repose of the ore pile. The specific construction steps are as follows:

[0028] The first step is to excavate the extended layered chute chamber 9 and the original layered new chute chamber 8, and then carry out anchor mesh shotcrete support after the excavation is completed;

[0029] The second step involves constructing an inclined chute 11 from the original layered new chute chamber 8 towards the original chute 7. The inclined chute 11 has a cross-section of 2m × 2m, an inclination angle of 55 degrees, and a depth of 6-8 meters. The inclined chute 11 is excavated manually in stages. The specific steps are as follows: First, the material level of the original chute 7 is filled to 2 meters above the pre-connection position with the inclined chute 11 before construction begins. Then, construction is stopped before the inclined chute 11 is connected to the original chute 7, and the material level of the original chute 7 is lowered to 2 meters below the pre-connection position before construction continues.

[0030] The third step, before the construction of the extension ore pass 10, involves filling the original ore pass 7 with ore up to the connection point of the inclined ore pass 11; after the inclined ore pass 11 is connected to the original ore pass 7, the construction of the extension ore pass 10 is organized and completed; the construction method for the extension ore pass 10 is a one-time well-forming blasting method; further, the specific steps of the one-time well-forming blasting method are as follows: first, 19 one-time well-forming holes are constructed from the original layered new ore pass chamber 8 upwards. The well-forming holes are vertical holes with a diameter of 80mm-110mm, and the depth of the well-forming holes is the same as the extension layer height. The well-forming holes are arranged within a 2.5m*2.5m rectangular area; then, explosives are loaded into the well-forming holes, and digital electronic detonators are used for inter-hole delayed blasting to form the well.

[0031] This method for extending underground ore passes solves the problems of insufficient service coverage and inability to meet haulage distance requirements in terms of elevation and horizontal level when connecting two intermediate sections of a gently dipping ore body. The method has a short construction period, does not disrupt normal production activities for extended periods, and has minimal impact on the normal use of transport roadway 3 and the original ore pass 7, thus improving production efficiency. It also saves on construction costs, reduces construction expenses, and avoids potential safety hazards caused by personnel and equipment working directly above the original ore pass 7. Furthermore, it enables rapid completion of the ore pass extension project and offers enhanced safety.

[0032] Example 2:

[0033] A method for extending an underground ore pass in a mine includes an original stratified section 1, an original stratified new stratified section 2, a transport roadway 3, and an extension stratified section 4. The original stratified section 1 has an original stratified ore pass chamber 5, the transport roadway 3 has a transport section 6, and an original ore pass 7 is located between the original stratified ore pass chamber 5 and the transport section 6. The original stratified new stratified section 2 has an original stratified new ore pass chamber 8. The extension stratified section 4 is located above the original stratified new stratified section 2 and has an extension stratified ore pass chamber 9. An extension ore pass 10 is located between the original stratified new ore pass chamber 8 and the extension ore pass chamber 9. An inclined ore pass 11 is also provided, running through the original stratified new ore pass chamber 8 and the original ore pass 7. The inclination angle of the inclined ore pass 11 is greater than the angle of repose of the ore pile. The specific construction steps are as follows:

[0034] The first step is to excavate the extended layered chute chamber 9 and the original layered new chute chamber 8, and then carry out anchor mesh shotcrete support after the excavation is completed;

[0035] The second step involves constructing an inclined chute 11 from the original layered new chute chamber 8 towards the original chute 7. The inclined chute 11 has a cross-section of 2m × 2m, an inclination angle of 55 degrees, and a depth of 6-8 meters. The inclined chute 11 is excavated manually in stages. The specific steps are as follows: First, the material level of the original chute 7 is filled to 2 meters above the pre-connection position with the inclined chute 11 before construction begins. Then, construction is stopped before the inclined chute 11 is connected to the original chute 7, and the material level of the original chute 7 is lowered to 2 meters below the pre-connection position before construction continues.

[0036] The third step, before the construction of the extension ore pass 10, involves filling the original ore pass 7 with ore up to the connection point of the inclined ore pass 11; after the inclined ore pass 11 is connected to the original ore pass 7, the construction of the extension ore pass 10 is organized and completed; the construction method for the extension ore pass 10 is a one-time well-forming blasting method; further, the specific steps of the one-time well-forming blasting method are as follows: first, 19 one-time well-forming holes are constructed from the original layered new ore pass chamber 8 upwards. The well-forming holes are vertical holes with a diameter of 80mm-110mm, and the depth of the well-forming holes is the same as the extension layer height. The well-forming holes are arranged within a 2.5m*2.5m rectangular area; then, explosives are loaded into the well-forming holes, and digital electronic detonators are used for inter-hole delayed blasting to form the well. A 70cm high and 60cm wide concrete retaining wall is installed at the connection opening between the extended layered chute chamber 9 and the extended chute 10; a 60cm thick reinforced concrete sealing wall with a strength of C20 is installed 7m outward from the connection opening between the original layered new chute chamber 8 and the inclined chute 11.

[0037] This method for extending underground ore passes not only solves the problems of insufficient service coverage and inability to meet haulage distance requirements in terms of elevation and horizontal level when connecting two intermediate sections of gently dipping orebody underground mining; it also has a short construction period, does not require long-term disruption to normal production activities, has minimal impact on the normal use of transport roadway 3 and the original ore pass 7, thus improving production efficiency; it also saves construction costs, reduces construction expenses, avoids potential safety hazards caused by personnel and equipment working directly above the original ore pass 7; and it enables rapid completion of the ore pass extension project with higher safety.

[0038] Based on Example 1, this embodiment adds a concrete retaining wall and a reinforced concrete enclosed wall to prevent vehicles or personnel from falling into the chute during production, thus further improving the safety of the production process.

[0039] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for extending an underground mine chute, comprising an original stratified middle section (1), an original stratified new middle section (2), a transport roadway (3), and an extended stratification (4); wherein the original stratified middle section (1) is provided with an original stratified chute chamber (5), the transport roadway (3) is provided with a transport middle section (6), and an original chute (7) is provided between the original stratified chute chamber (5) and the transport middle section (6); the original stratified new middle section (2) is provided with an original stratified new chute chamber (8), the extended stratification (4) is located above the original stratified new middle section (2), the extended stratification (4) is provided with an extended stratified chute chamber (9), and an extended chute (10) is provided between the original stratified new chute chamber (8) and the extended stratified chute chamber (9), characterized in that: A sloping chute (11) is also provided, which is connected between the original layered new chute chamber (8) and the original chute (7). The inclination angle of the sloping chute (11) is greater than the angle of repose of the ore pile. The specific construction steps are as follows: Step 1: Excavate the extended layered chute chamber (9) and the original layered new chute chamber (8); The second step is to construct the inclined chute (11) from the original layered new chute chamber (8) to the original chute (7); Third step: After the inclined chute (11) is connected to the original chute (7), the construction of the extended chute (10) is organized.

2. The method for extending an underground mine chute according to claim 1, characterized in that: In the first step, after the original layered new chute chamber (8) and the extended layered chute chamber (9) are excavated, anchor mesh shotcrete support is carried out.

3. The method for extending an underground mine chute according to claim 1, characterized in that: In the second step, the cross-section of the inclined chute (11) is 2m×2m, the inclination angle is 55 degrees, and the depth is 6-8 meters.

4. The method for extending an underground mine chute according to claim 3, characterized in that: The inclined chute (11) is excavated manually in stages. The specific steps are as follows: First, the material level of the original chute (7) is filled to 2 meters above the pre-connection position of the inclined chute (11) before construction begins; then, construction is stopped before the inclined chute (11) and the original chute (7) are connected, and the material level of the original chute (7) is lowered to 2 meters below the pre-connection position before construction continues.

5. The method for extending an underground mine chute according to claim 1, characterized in that: In the third step, before the construction of the extended chute (10), the ore in the original chute (7) is filled to the position of the opening of the inclined chute (11).

6. The method for extending an underground mine chute according to claim 1, characterized in that: In the third step, the construction method of the extended chute (10) is to use a one-time well-forming blasting method.

7. A method for extending an underground mine chute according to claim 6, characterized in that: The specific steps of the single-stage well-forming blasting method are as follows: First, 19 single-stage well-forming holes are constructed from the original layered new chute chamber (8) upwards. The well-forming holes are vertical holes with a diameter of 80mm-110mm. The depth of the well-forming holes is the same as the height of the extended layer. The well-forming holes are arranged within a rectangular area of ​​2.5m*2.5m. Then, explosives are loaded into the well-forming holes, and digital electronic detonators are used for inter-hole delayed blasting to form a well.

8. The method for extending an underground mine chute according to claim 1, characterized in that: A concrete retaining wall 70cm high and 60cm wide is provided at the wellhead of the extension layered chute chamber (9) and the extension chute (10).

9. A method for extending an underground mine chute according to claim 1, characterized in that: A reinforced concrete sealing wall with a thickness of 60cm and a strength of C20 is installed 7m outward from the connecting wellhead of the original layered new chute chamber (8) and the inclined chute (11).

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