Method for constructing an ore pass

Abstract

The present application provides a method for constructing a ore pass, which relates to the field of underground mine engineering. The method for constructing a ore pass includes: constructing the reinforcement holes in the well obliquely upward, and after the reinforcement holes in the well are constructed through the soft and broken mudstone layer, grouting in the reinforcement holes in the well; constructing the reinforcement holes outside the well obliquely upward, and after the reinforcement holes outside the well are constructed through the soft and broken mudstone layer, first inserting steel strands and deformed steel bars, and then grouting the reinforcement holes outside the well; constructing the first guiding hole obliquely upward, and constructing the first guiding hole through the soft and broken mudstone layer. After the construction is completed, grouting and hole cleaning are carried out in the first guiding hole; constructing the second guiding hole obliquely downward. After the second guiding hole is constructed to the first guiding hole, the cement slurry in the first guiding hole is removed, and the construction continues downward; carrying out hole enlargement construction obliquely upward on the second guiding hole. The present application improves the construction safety factor of the ore pass, ensures the construction efficiency of the ore pass, reduces the construction cost and time cost, and enhances the overall stability of the ore pass.

Description

Technical Field

[0001] The present application relates to the field of underground mine engineering, and more particularly, to a method for constructing a chute. Background Art

[0002] In mine mining operations, the chute undertakes the core task of transporting ore from the upper mining level to the lower level. Its construction method and stability are key factors determining whether a mine can achieve efficient and safe production. However, once the chute construction project involves crossing soft and broken mudstone layers, many difficult problems will be encountered.

[0003] The soft and broken mudstone layer itself has many poor characteristics. First of all, the strength of the soft and broken mudstone layer is extremely low, with extensive internal joints and fractures and poor integrity, resulting in very limited bearing capacity of the rock layer. During the construction of the pilot hole of the chute, the drilling operation is extremely likely to cause the loosening and collapse of the surrounding rocks, greatly increasing the difficulty of forming the hole. It is often necessary to repeatedly repair the drill hole, seriously affecting the construction progress. Secondly, the soft and broken mudstone layer is easy to soften when encountering water. There is usually a certain amount of groundwater in the mine mining environment. During the construction and subsequent use of the chute, once the groundwater contacts the soft and broken mudstone layer, the mechanical properties of the rock layer will drop sharply. The softened rock layer cannot provide enough support force for the chute shaft wall, resulting in the deformation and rupture of the shaft wall, and even small pieces of rock falling off in some areas, which not only increases the maintenance cost, but also seriously hinders the ore transportation and reduces the production efficiency.

[0004] Traditional chute construction methods lack effective targeted measures when facing soft and broken mudstone layers. During the construction stage of the pilot hole, since the soft and broken mudstone layer around the pilot hole is not effectively reinforced and improved, the pilot hole is extremely likely to collapse, making it difficult to ensure the accuracy of its inclination angle and aperture, which brings great difficulties to the subsequent expansion construction of the chute. Moreover, the built chute has insufficient anti-smashing and anti-impact capabilities, and the shaft wall is easily damaged under the impact force during the falling process of the ore, shortening the service life of the chute. Summary of the Invention

[0005] The purpose of the present application is to provide a method for constructing a chute, which can improve the construction safety factor of the chute, ensure the construction efficiency of the chute, reduce the construction cost and time cost, greatly enhance the overall stability of the chute, and ensure the long-term safe and stable operation of the chute.

[0006] The present application provides a method for constructing a chute, which is used for construction through soft and broken mudstone layers. The method for constructing the chute includes:

[0007] According to the preset inclination angle of the chute, mark the center point and range of the lower opening of the chute at the horizontal middle section of the lower opening of the chute, and mark the center point and range of the upper opening of the chute at the horizontal middle section of the upper opening of the chute;

[0008] In the range of the lower opening of the chute, a well reinforcement hole is constructed obliquely upward at a preset inclination angle, and after the well reinforcement hole is constructed to pass through the soft and broken mudstone layer, grouting is injected into the well reinforcement hole;

[0009] Outside the lower opening of the chute, an outer well reinforcement hole is constructed obliquely upward at a preset inclination angle, and after the outer well reinforcement hole is constructed to pass through the soft broken mudstone layer, a steel strand and a threaded steel bar are first inserted, and then grouting is performed on the outer well reinforcement hole;

[0010] Within the range of the lower opening of the chute, a first guide hole is constructed obliquely upward with the center point of the lower opening of the chute as the center of the circle, and the first guide hole is constructed until it passes through the soft and broken mudstone layer. After the construction is completed, grouting and hole sweeping are performed in the first guide hole, and the bottom of the first guide hole is sealed after the hole sweeping;

[0011] Within the range of the upper opening of the chute, a second guide hole is constructed obliquely downward with the center point of the upper opening of the chute as the center of the circle. After the second guide hole is constructed to the first guide hole, the cement slurry in the first guide hole is removed and the construction is continued downward until the horizontal middle section of the lower opening of the chute is constructed;

[0012] The second guide hole is expanded obliquely upward from the horizontal middle section of the lower opening of the chute, and after the construction reaches the horizontal middle section of the upper opening of the chute, a chute is obtained.

[0013] Furthermore, constructing the reinforcement holes in the well includes constructing a first reinforcement hole in the well and a second reinforcement hole in the well, and constructing a plurality of the first reinforcement holes in the well in a circular array around the center point of the lower opening of the well within the range of the lower opening of the well, and then constructing a plurality of the second reinforcement holes in the well in a circular array around the center point of the lower opening of the well within the range of the lower opening of the well, and the array radius of the second reinforcement holes in the well is greater than the array radius of the first reinforcement holes in the well.

[0014] Furthermore, when constructing the first well reinforcement holes, according to the principle of interval construction, the odd-numbered first well reinforcement holes are constructed first, and based on the degree of hole collapse and grouting amount of the first well reinforcement holes constructed first, the even-numbered first well reinforcement holes are constructed.

[0015] Furthermore, the number and positions of the reinforcement holes in the second well are arranged according to the degree of hole collapse and the amount of grouting of the reinforcement holes in the first well.

[0016] Furthermore, one second well reinforcement hole is constructed between two adjacent first well reinforcement holes.

[0017] Further, the construction of the external well reinforcement holes includes the construction of the first external well reinforcement holes and the second external well reinforcement holes. A plurality of the first external well reinforcement holes are constructed in a circular array around the center point of the lower opening of the ore pass outside the range of the lower opening of the ore pass, and then a plurality of the second external well reinforcement holes are constructed in a circular array around the center point of the lower opening of the ore pass outside the range of the lower opening of the ore pass. The array radius of the second external well reinforcement holes is greater than the array radius of the first external well reinforcement holes.

[0018] Further, the internal well reinforcement holes and the external well reinforcement holes are constructed parallel to each other at a preset inclination angle.

[0019] Further, the second guiding hole is constructed with a larger aperture than that of the first guiding hole.

[0020] Further, the first guiding hole is located at the center of the second guiding hole.

[0021] Further, the center point and range of the upper opening of the ore pass are marked in the raise boring chamber of the horizontal section at the upper opening of the ore pass, and the center point and range of the lower opening of the ore pass are marked in the middle section ore drawing connecting roadway of the horizontal section at the lower opening of the ore pass. After the construction of the ore pass is completed, the raise boring chamber and the middle section ore drawing connecting roadway are connected.

[0022] Compared with the prior art, the beneficial effects of the present application are as follows:

[0023] (1) In the present application, the internal well reinforcement holes are arranged around the first guiding hole to stabilize the soft broken mudstone layer, greatly reducing the risk of collapse of the first guiding hole during the construction process. This not only reduces equipment damage caused by collapse accidents, ensures the safety of construction personnel, but also avoids project delays caused by accidents, enabling the entire construction process to be efficiently promoted in a safe environment.

[0024] (2) In the present application, through the external well reinforcement holes, the anti - impact and anti - smashing ability of the ore pass is significantly improved, enabling it to withstand the strong impact force during the falling process of the ore, thereby reducing the possibility of problems such as cracks, deformation, and damage to the ore pass wall, extending the service life of the ore pass, and reducing the high costs brought by frequent repairs or reconstructions.

[0025] (3) In the present application, the first guiding hole is constructed first in the second guiding hole. After the drilling of the first guiding hole is completed, grouting is carried out first and then the hole is reamed, and the bottom of the hole is blocked as a grout - stopping structure, effectively improving the performance of the soft broken mudstone layer around the second guiding hole, providing an accurate space and azimuth guidance for the construction of the second guiding hole, effectively ensuring the construction accuracy of the second guiding hole, reducing the correction work due to positioning deviation, and accelerating the construction progress. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 Shows the flow chart of the raise construction method in this embodiment;

[0028] Figure 2 Shows the plan view of the raise construction in this embodiment;

[0029] Figure 3 Shows Figure 2 The schematic cross-sectional view of section Ⅰ-Ⅰ in

[0030] Main element symbol description:

[0031] 100 - Raise; 101 - Horizontal section at the lower opening of the raise; 102 - Horizontal section at the upper opening of the raise; 110 - Reinforcement holes in the well; 111 - First reinforcement hole in the well; 112 - Second reinforcement hole in the well; 120 - Reinforcement holes outside the well; 121 - First reinforcement hole outside the well; 122 - Second reinforcement hole outside the well; 130 - First guiding hole; 140 - Second guiding hole; 200 - Raise boring chamber; 300 - Intermediate ore drawing connecting roadway; 400 - Soft broken mudstone layer. Detailed implementation manners

[0032] The following will describe in detail the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals from beginning to end indicate the same or similar elements or elements with the same or similar functions. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless specifically defined otherwise.

[0035] In this application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] Please refer to Figure 2 . This embodiment is applicable to the construction of the ore pass 100 in the soft and broken mudstone layer 400. The rock stratum of the soft and broken mudstone layer 400 has low strength, developed internal joints, poor stability, and is extremely vulnerable to damage under the action of vibration.

[0038] This embodiment provides a method for constructing an ore pass, and the method for constructing the ore pass includes the following steps:

[0039] Please refer to in combination Figures 1 to 3 .

[0040] S100. According to the preset inclination angle of the ore pass 100, mark the center point and range of the lower opening of the ore pass 100 at the lower horizontal section 101 of the ore pass, and mark the center point and range of the upper opening of the ore pass 100 at the upper horizontal section 102 of the ore pass.

[0041] In actual operation, the center point and range of the upper opening of the ore pass 100 are marked in the raise boring chamber 200 of the horizontal middle section 102 at the upper opening of the ore pass, and the center point and range of the lower opening of the ore pass 100 are marked in the middle section ore drawing connecting roadway 300 of the horizontal middle section 101 at the lower opening of the ore pass. After the ore pass 100 is constructed, the raise boring chamber 200 and the middle section ore drawing connecting roadway 300 are connected.

[0042] Exemplarily, the following settings can be made in this embodiment: the diameter of the shaft of the ore pass 100 is 2 m, the length of the ore pass 100 is 120 m, and the preset inclination angle is 75°. That is, the ranges of both the upper opening and the lower opening of the ore pass 100 are ranges with a diameter of 2 m centered on their respective center points.

[0043] S200. In the range of the lower opening of the ore pass 100, construct the in-well reinforcement holes 110 obliquely upward at the preset inclination angle, and after the in-well reinforcement holes 110 are constructed to penetrate through the soft and broken mudstone layer 400, grout in the in-well reinforcement holes 110.

[0044] In some embodiments, constructing the in-well reinforcement holes 110 includes constructing the first in-well reinforcement holes 111 and the second in-well reinforcement holes 112. A plurality of first in-well reinforcement holes 111 are constructed in a circular array around the center point of the lower opening of the ore pass 100 within the range of the lower opening of the ore pass 100, and then a plurality of second in-well reinforcement holes 112 are constructed in a circular array around the center point of the lower opening of the ore pass 100 within the range of the lower opening of the ore pass 100. The array radius of the second in-well reinforcement holes 112 is greater than the array radius of the first in-well reinforcement holes 111.

[0045] When constructing the first in-well reinforcement holes 111, in accordance with the principle of interval construction, first construct the odd-numbered first in-well reinforcement holes 111, and then construct the even-numbered first in-well reinforcement holes 111 according to the collapse degree and grouting volume of the previously constructed first in-well reinforcement holes 111.

[0046] According to the collapse degree and grouting volume of the first in-well reinforcement holes 111, arrange the quantity and positions of the second in-well reinforcement holes 112.

[0047] In this embodiment, one second in-well reinforcement hole 112 is constructed between two adjacent first in-well reinforcement holes 111, that is, the first in-well reinforcement holes 111 and the second in-well reinforcement holes 112 are arranged in a staggered manner. The staggered arrangement can provide a certain supporting force for the soft and broken mudstone layer 400, preventing the soft and broken mudstone layer 400 from moving under the vibration of the drilling, resulting in the collapse accident of the hole position.

[0048] Exemplarily, the radial distance between the centers of the reinforcement holes 112 in the second well and the centers of the reinforcement holes 111 in the first well is 50 - 100 mm, and the diameters of the reinforcement holes 112 in the second well and the reinforcement holes 111 in the first well are 60 mm. For example: A total of 8 holes, namely A1 - A8, are evenly arranged according to the circumference in the first well reinforcement holes 111. The radial distance between the centers of the reinforcement holes 112 in the second well and the centers of the reinforcement holes 111 in the first well is 50 mm. A total of 8 holes, namely B1 - B8, are evenly arranged according to the circumference in the second well reinforcement holes 112.

[0049] In this embodiment, the well - inner reinforcement holes 110 are used to stabilize the soft and broken mudstone layer 400, greatly reducing the risk of collapse of the first guiding hole 130 during construction. This not only reduces equipment damage caused by collapse accidents, ensures the safety of construction personnel, but also avoids project delays caused by accidents, enabling the entire construction process to be efficiently promoted in a safe environment.

[0050] S300. Outside the lower - mouth range of the ore pass 100, construct the well - outer reinforcement holes 120 obliquely upward at a preset inclination angle. After the well - outer reinforcement holes 120 are constructed to penetrate through the soft and broken mudstone layer 400, first insert steel strands and deformed steel bars, and then grout the well - outer reinforcement holes 120.

[0051] In some embodiments, constructing the well - outer reinforcement holes 120 includes constructing the first well - outer reinforcement holes 121 and the second well - outer reinforcement holes 122. A plurality of first well - outer reinforcement holes 121 are constructed in a circular array around the center point of the lower mouth of the ore pass 100 outside the lower - mouth range of the ore pass 100, and then a plurality of second well - outer reinforcement holes 122 are constructed in a circular array around the center point of the lower mouth of the ore pass 100 outside the lower - mouth range of the ore pass 100. The array radius of the second well - outer reinforcement holes 122 is greater than the array radius of the first well - outer reinforcement holes 121.

[0052] The well - inner reinforcement holes 110 and the well - outer reinforcement holes 120 are constructed parallel to each other at a preset inclination angle. First, construct the well - inner reinforcement holes 110, and then construct the well - outer reinforcement holes 120. It can be understood that this embodiment includes one circle of first well - inner reinforcement holes 111, one circle of second well - inner reinforcement holes 112, one circle of first well - outer reinforcement holes 121, and one circle of second well - outer reinforcement holes 122, a total of four circles of reinforcement holes. The four circles of reinforcement holes are constructed at an inclination angle of 75°.

[0053] In some other embodiments, the quantity and arrangement of the well - inner reinforcement holes 110 can be flexibly configured, and the quantity and arrangement of the well - outer reinforcement holes 120 can also be flexibly configured, which are not limited herein.

[0054] Since the cement slurry in the external well reinforcement holes 120 does not need to be removed during the later construction process, in order to improve the stability of the cement slurry in the external well reinforcement holes 120, when constructing the external well reinforcement holes 120, steel strands and deformed steel bars are first inserted, and then grouting is carried out. The cement slurry in the external well reinforcement holes 120 greatly improves the anti-smashing and anti-impact capabilities of the ore pass 100.

[0055] Exemplarily, before grouting, 1 steel strand and 1 deformed steel bar need to be inserted into each external well reinforcement hole 120, with a total length of 40 m. The lap length of the deformed steel bars is not less than 40 cm. The steel strands and deformed steel bars are tied together with wire every 2 - 4 m.

[0056] Similar to the internal well reinforcement holes 110, a second external well reinforcement hole 122 is constructed between two adjacent first external well reinforcement holes 121, that is, the first external well reinforcement holes 121 and the second external well reinforcement holes 122 are arranged in a staggered manner. This staggered arrangement method can support the shaft wall of the ore pass 100 in all directions, ensuring the safety and reliability of the ore pass 100.

[0057] During construction, in accordance with the principle of interval construction, the odd-numbered holes are constructed first, and then the even-numbered holes are constructed. First, the first external well reinforcement holes 121 are constructed, and then the second external well reinforcement holes 122 are constructed, stabilizing the soft broken mudstone layer 400 to the greatest extent and avoiding collapse accidents.

[0058] Exemplarily, the radial distance between the center of the first external well reinforcement hole 121 and the shaft wall of the ore pass 100 is 500 - 700 mm, and the radial distance between the center of the second external well reinforcement hole 122 and the center of the first external well reinforcement hole 121 is 300 - 500 mm.

[0059] For example: the radial distance between the center of the first external well reinforcement hole 121 and the shaft wall of the ore pass 100 is 500 mm, and a total of 16 holes C1 - C16 are evenly arranged according to the circumference. The radial distance between the center of the second external well reinforcement hole 122 and the center of the first external well reinforcement hole 121 is 300 mm, and a total of 16 holes D1 - D16 are evenly arranged according to the circumference.

[0060] For the convenience of description and understanding, in this embodiment, the first internal well reinforcement hole 111, the second internal well reinforcement hole 112, the first external well reinforcement hole 121, and the second external well reinforcement hole 122 are collectively referred to as upward holes.

[0061] The diameter of the upward holes is 60 - 100 mm. For example: the diameters of the first internal well reinforcement hole 111, the second internal well reinforcement hole 112, and the first external well reinforcement hole 121 are all 80 mm, and the diameter of the second external well reinforcement hole 122 is 60 mm.

[0062] The length of the upward holes is greater than the distance from the top of the soft and broken mudstone layer 400 to the lower shaft outlet horizontal section 101, and the vertical length of the upward holes is greater than the vertical distance from the top of the soft and broken mudstone layer 400 to the lower outlet horizontal section. For example, if the distance from the top of the soft and broken mudstone layer 400 to the lower shaft outlet horizontal section 101 is 35m, the length of the upward holes is 40m.

[0063] In some embodiments, the inclination angle of the upward holes is the same as the preset inclination angle of the shaft 100.

[0064] During the construction of the upward drilling holes, small water volume is used for drilling to control the collapse of the drilling holes to the greatest extent. If the drilling hole collapses, the drill bit should be withdrawn in time and grouted for plugging, and then drilling should be restarted 48h later.

[0065] In addition, the grouting pressure of the upward holes is not less than 10MPa, the water-cement ratio of the grout is 0.75:1, and the grouting material should be a composite cement grout with high strength and low shrinkage to ensure sufficient grouting volume and reinforcement effect.

[0066] In this embodiment, through the external reinforcement holes 120, the anti-smashing and anti-impact capabilities of the shaft 100 are significantly improved, enabling it to withstand the strong impact force during the falling process of the ore, thereby reducing the possibility of problems such as cracks, deformation, and damage to the shaft wall of the shaft 100, extending the service life of the shaft 100, and reducing the high costs brought by frequent maintenance or reconstruction.

[0067] S400. Within the lower opening range of the shaft 100, the first guiding hole 130 is constructed obliquely upward with the center point of the lower opening of the shaft 100 as the center, and the first guiding hole 130 is constructed to penetrate through the soft and broken mudstone layer 400. After the construction is completed, grouting and hole cleaning are carried out in the first guiding hole 130, and the bottom of the first guiding hole 130 is plugged after hole cleaning.

[0068] After the drilling of the first guiding hole 130 is completed, a composite cement grout is first injected. After the grout solidifies for 24h, hole cleaning is carried out, and a cement-based gel solid is used to plug the bottom of the hole. The plugging length is 2 - 3m, which serves as a grout stop structure during the construction of the second guiding hole 140 in the following text.

[0069] S500. Within the upper opening range of the shaft 100, the second guiding hole 140 is constructed obliquely downward with the center point of the upper opening of the shaft 100 as the center. After the second guiding hole 140 reaches the first guiding hole 130, the cement grout in the first guiding hole 130 is removed, and the construction continues downward until it reaches the lower shaft outlet horizontal section 101.

[0070] Construction is carried out with the aperture of the second guiding hole 140 being larger than that of the first guiding hole 130, and the first guiding hole 130 is located at the center of the second guiding hole 140. Grouting in the first guiding hole 130 not only improves the performance of the soft broken mudstone layer 400, but also provides space and azimuth guidance for the construction of the second guiding hole 140.

[0071] To ensure that the second guiding hole 140 can smoothly pass through the soft broken mudstone layer 400, during construction, the in-well reinforcement holes 110 are arranged between the second guiding hole 140 and the wall of the ore pass 100, that is, multiple in-well reinforcement holes 110 are arranged in a ring around the second guiding hole 140 to provide support force for the second guiding hole 140.

[0072] Exemplarily, the radial distance between the center of the first in-well reinforcement hole 111 and the hole wall of the second guiding hole 140 is 100 - 150 mm, and they are evenly arranged according to the circumference. For example, the radial distance between the center of the first in-well reinforcement hole 111 and the hole wall of the second guiding hole 140 is 100 mm, and a total of 8 holes A1 - A8 are evenly arranged according to the circumference.

[0073] In this embodiment, the first guiding hole 130 is constructed in the second guiding hole 140 first. After the drilling of the first guiding hole 130 is completed, grouting is carried out first and then the hole is reamed, and the bottom of the hole is blocked as a grout stop structure, effectively improving the performance of the soft broken mudstone layer 400 around the second guiding hole 140, providing accurate space and azimuth guidance for the construction of the second guiding hole 140, effectively guaranteeing the construction accuracy of the second guiding hole 140, reducing the correction work due to positioning deviation, and accelerating the construction progress.

[0074] S600. Reaming construction is carried out obliquely upward from the lower horizontal section 101 of the ore pass bottom to the second guiding hole 140. After the construction reaches the upper horizontal section 102 of the ore pass, the ore pass 100 is obtained.

[0075] Specifically, the reaming construction is carried out by a raiseboring machine with positive circulation drilling.

[0076] This embodiment fundamentally solves the problems such as the collapse problem faced during the construction of the ore pass 100 passing through the soft broken mudstone layer 400 and the poor stability of the ore pass 100 after completion, and has the characteristics of simple process, safety and high efficiency, and good universality.

[0077] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for constructing a chute for construction through a soft and broken mudstone layer, characterized in that: include: According to the preset inclination angle of the chute, mark the center point and range of the lower opening of the chute at the horizontal middle section of the lower opening of the chute, and mark the center point and range of the upper opening of the chute at the horizontal middle section of the upper opening of the chute; In the range of the lower opening of the chute, a well reinforcement hole is constructed obliquely upward at a preset inclination angle, and after the well reinforcement hole is constructed to pass through the soft and broken mudstone layer, grouting is injected into the well reinforcement hole; Outside the lower opening of the chute, an outer well reinforcement hole is constructed obliquely upward at a preset inclination angle, and after the outer well reinforcement hole is constructed to pass through the soft broken mudstone layer, a steel strand and a threaded steel bar are first inserted, and then grouting is performed on the outer well reinforcement hole; Within the range of the lower opening of the chute, a first guide hole is constructed obliquely upward with the center point of the lower opening of the chute as the center of the circle, and the first guide hole is constructed until it passes through the soft and broken mudstone layer. After the construction is completed, grouting and hole sweeping are performed in the first guide hole, and the bottom of the first guide hole is sealed after the hole sweeping; Within the range of the upper opening of the chute, a second guide hole is constructed obliquely downward with the center point of the upper opening of the chute as the center of the circle. After the second guide hole is constructed to the first guide hole, the cement slurry in the first guide hole is removed and the construction is continued downward until the horizontal middle section of the lower opening of the chute is constructed; The second guide hole is expanded obliquely upward from the horizontal middle section of the lower opening of the chute, and after the construction reaches the horizontal middle section of the upper opening of the chute, a chute is obtained.

2. The method for constructing a chute according to claim 1, characterized in that: The construction of the well reinforcement holes includes constructing a first well reinforcement hole and a second well reinforcement hole, wherein a plurality of the first well reinforcement holes are constructed in a circular array around the center point of the well lower opening within the range of the well lower opening, and then a plurality of the second well reinforcement holes are constructed in a circular array around the center point of the well lower opening within the range of the well lower opening, wherein the array radius of the second well reinforcement holes is greater than the array radius of the first well reinforcement holes.

3. The method for constructing a chute according to claim 2, characterized in that: When constructing the first well reinforcement holes, according to the principle of interval construction, the odd-numbered first well reinforcement holes are constructed first, and then the even-numbered first well reinforcement holes are constructed according to the collapse degree and grouting amount of the first well reinforcement holes constructed first.

4. The method for constructing a chute as claimed in claim 3, characterized in that: The number and positions of the reinforcement holes in the second well are arranged according to the collapse degree and grouting amount of the reinforcement holes in the first well.

5. The method for constructing a chute according to any one of claims 2 to 4, characterized in that: One second well reinforcement hole is constructed between two adjacent first well reinforcement holes.

6. The method for constructing a chute according to any one of claims 1 to 4, characterized in that: The construction of the outer well reinforcement holes includes constructing a first outer well reinforcement hole and a second outer well reinforcement hole, and constructing a plurality of the first outer well reinforcement holes in a circular array around the center point of the lower opening of the chute outside the range of the lower opening of the chute, and then constructing a plurality of the second outer well reinforcement holes in a circular array around the center point of the lower opening of the chute outside the range of the lower opening of the chute, and the array radius of the second outer well reinforcement holes is greater than the array radius of the first outer well reinforcement holes.

7. The method for constructing a chute according to any one of claims 1 to 4, characterized in that: The in-well reinforcement holes and the out-well reinforcement holes are constructed parallel to each other at a preset inclination angle.

8. The method for constructing a chute according to any one of claims 1 to 4, characterized in that: The second guide hole is constructed with a diameter larger than that of the first guide hole.

9. The method for constructing a chute as claimed in claim 8, characterized in that: The first guiding hole is located at the center of the second guiding hole.

10. The method for constructing a chute according to any one of claims 1 to 4, characterized in that: The center point and range of the upper opening of the chute are marked in the reverse drilling chamber in the horizontal middle section of the upper opening of the chute, and the center point and range of the lower opening of the chute are marked in the middle section ore discharge link in the horizontal middle section of the lower opening of the chute. After the chute is built, the reverse drilling chamber and the middle section ore discharge link are connected.

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