Method for building draw shaft

Abstract

The invention provides a draw shaft construction method, and relates to the field of mine underground engineering. The draw shaft building method comprises the steps that an in-well reinforcing hole is constructed in an inclined upward mode, and after the in-well reinforcing hole is constructed to penetrate through a soft mud breaking rock stratum, grouting is conducted in the in-well reinforcing hole; an out-well reinforcing hole is constructed obliquely upwards, after the out-well reinforcing hole is constructed till the out-well reinforcing hole penetrates through the soft mud breaking rock stratum, a steel strand and a deformed steel bar are stuffed into the out-well reinforcing hole, and then grouting is conducted on the out-well reinforcing hole; a first guide hole is constructed obliquely upwards, the first guide hole is constructed till the first guide hole penetrates through the soft mud breaking rock stratum, and after construction is completed, grouting is conducted in the first guide hole, and hole sweeping is conducted; a second guide hole is constructed obliquely downwards, after the second guide hole is constructed to the first guide hole, cement grout in the first guide hole is removed, and downward construction continues; and the second guide hole is subjected to inclined upward reaming construction. The construction safety coefficient of the draw shaft is improved, the draw shaft construction efficiency is guaranteed, the construction cost and the time cost are reduced, and the overall stability of the draw shaft is enhanced.

Description

Technical Field

[0001] The present application relates to the field of underground mining engineering, and in particular to a method for constructing a chute. Background Art

[0002] In mining operations, the chute is responsible for the transfer of ore from the upper mining level to the lower level. Its construction method and stability are key factors in determining whether the mine can achieve efficient and safe production. However, once the chute construction project involves crossing the soft and broken mudstone layer, it will encounter many difficult problems.

[0003] The soft and broken mudstone layer itself has many undesirable characteristics. First, the soft and broken mudstone layer has extremely low strength, and the internal joints and fissures are widely distributed, and the integrity is poor, resulting in a very limited bearing capacity of the rock layer. During the construction of the chute guide hole, the drilling operation can easily cause the loosening and collapse of the surrounding rocks, which greatly increases the difficulty of hole formation. It is often necessary to repeatedly repair the borehole, which seriously affects the construction progress. Secondly, the soft and broken mudstone layer is easy to soften when it comes into contact with water. There is usually a certain amount of groundwater in the mining environment. During the construction and subsequent use of the chute, once the groundwater comes into contact with the soft and broken mudstone layer, the mechanical properties of the rock layer will drop sharply. The softened rock layer cannot provide sufficient support for the chute wall, which leads to deformation and rupture of the wall. In some areas, small pieces of rock even fall off, which not only increases the maintenance cost, but also seriously hinders the transportation of ore and reduces production efficiency.

[0004] Traditional chute construction methods lack effective targeted measures when facing soft and broken mudstone layers. During the pilot hole construction stage, due to the lack of effective reinforcement and improvement of the soft and broken mudstone layer around the pilot hole, the pilot hole is very easy to collapse, and it is difficult to ensure the accuracy of its inclination and aperture, which brings great difficulties to the subsequent expansion of the chute. Moreover, the chute after construction is not able to resist smashing and impact. Under the impact force of the ore falling, the wall of the well is easily damaged, shortening the service life of the chute. Summary of the invention

[0005] The purpose of this application is to provide a chute construction method that can improve the construction safety factor of the chute, ensure the chute construction efficiency, reduce 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 chute construction method, which is used for construction through a soft and broken mudstone layer. The chute construction method comprises: 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] Furthermore, one second well reinforcement hole is constructed between two adjacent first well reinforcement holes.

[0011] Furthermore, constructing the outside-well reinforcement holes includes constructing a first outside-well reinforcement hole and a second outside-well reinforcement hole, and constructing a plurality of the first outside-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 outside-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 outside-well reinforcement holes is larger than the array radius of the first outside-well reinforcement holes.

[0012] Furthermore, the in-well reinforcement holes and the out-well reinforcement holes are constructed parallel to each other at a preset inclination angle.

[0013] Furthermore, the second guide hole is constructed with a diameter larger than that of the first guide hole.

[0014] Furthermore, the first guiding hole is located at the center of the second guiding hole.

[0015] Furthermore, 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 channel in the horizontal middle section of the lower opening of the chute. After the chute is constructed, the reverse drilling chamber and the middle section ore discharge channel are connected.

[0016] Compared with the prior art, the beneficial effects of this application are: (1) The present application stabilizes the soft and broken mudstone layer by setting up in-well reinforcement holes around the first guide hole, thereby greatly reducing the risk of collapse of the first guide hole during construction. This not only reduces equipment damage caused by collapse accidents and protects the lives of construction workers, but also avoids project delays caused by accidents, allowing the entire construction process to be carried out efficiently in a safe environment.

[0017] (2) The present application significantly improves the ability of the chute to resist impact and smashing by using the external reinforcement holes, so that it can withstand the strong impact force during the falling process of ore, thereby reducing the possibility of cracks, deformation, damage and other problems on the chute wall, extending the service life of the chute, and reducing the high cost caused by frequent maintenance or reconstruction.

[0018] (3) The present application constructs the first guide hole in the second guide hole first, injects grout and then sweeps the hole after the drilling of the first guide hole is completed, and seals the bottom of the hole as a grouting stop structure, thereby effectively improving the performance of the soft and broken mudstone layer around the second guide hole, providing accurate spatial and azimuthal guidance for the construction of the second guide hole, effectively ensuring the accuracy of the construction of the second guide hole, reducing the correction work due to positioning deviation, and accelerating the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A flow chart of the method for constructing a chute in this embodiment is shown; Figure 2 The schematic plan view of the construction of the chute in this embodiment is shown; Figure 3 Shows Figure 2 Schematic diagram of the section Ⅰ-Ⅰ.

[0021] Description of main component symbols: 100- chute; 101- horizontal middle section of the lower opening of the chute; 102- horizontal middle section of the upper opening of the chute; 110- reinforcement holes in the well; 111- first reinforcement holes in the well; 112- second reinforcement holes in the well; 120- reinforcement holes outside the well; 121- first reinforcement holes outside the well; 122- second reinforcement holes outside the well; 130- first guide hole; 140- second guide hole; 200- reverse drilling chamber; 300- middle section ore discharge channel; 400- soft broken mudstone layer. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] See also Figure 2 This embodiment is applicable to the construction of a chute 100 in a soft and broken mudstone layer 400. The soft and broken mudstone layer 400 has low rock strength, developed internal joints, poor stability, and is easily damaged under vibration.

[0028] This embodiment provides a chute construction method, which includes the following steps: Please refer to Figures 1 to 3 .

[0029] S100. According to the preset inclination angle of the chute 100, mark the center point and range of the lower opening of the chute 100 on the horizontal middle section 101 of the lower opening of the chute, and mark the center point and range of the upper opening of the chute 100 on the horizontal middle section 102 of the upper opening of the chute.

[0030] In actual use, the center point and range of the upper opening of the chute 100 are marked in the reverse drilling chamber 200 of the horizontal middle section 102 of the upper opening of the chute, and the center point and range of the lower opening of the chute 100 are marked in the middle section ore discharge link 300 of the horizontal middle section 101 of the lower opening of the chute. After the construction of the chute 100 is completed, the reverse drilling chamber 200 and the middle section ore discharge link 300 are connected.

[0031] For example, the present embodiment can be set as follows: the shaft diameter of the chute 100 is 2m, the length of the chute 100 is 120m, and the preset inclination angle is 75°. That is, the range of the upper opening of the chute 100 and the range of the lower opening of the chute 100 are both ranges with a diameter of 2m with their respective center points as the center of the circle.

[0032] S200. In the range of the lower opening of the chute 100 , a well reinforcement hole 110 is constructed obliquely upward at a preset inclination angle, and after the well reinforcement hole 110 is constructed to pass through the soft and broken mudstone layer 400 , grouting is injected into the well reinforcement hole 110 .

[0033] In some embodiments, constructing the well reinforcement holes 110 includes constructing a first well reinforcement hole 111 and a second well reinforcement hole 112, wherein a plurality of first well reinforcement holes 111 are constructed in a circular array around the center point of the lower opening of the chute 100 within the range of the lower opening of the chute 100, and then a plurality of second well reinforcement holes 112 are constructed in a circular array around the center point of the lower opening of the chute 100 within the range of the lower opening of the chute 100, wherein the array radius of the second well reinforcement holes 112 is greater than the array radius of the first well reinforcement holes 111.

[0034] When constructing the first well reinforcement holes 111, according to the principle of interval construction, the odd-numbered first well reinforcement holes 111 are constructed first, and according to the collapse degree and grouting amount of the first well reinforcement holes 111 constructed first, the even-numbered first well reinforcement holes 111 are constructed next.

[0035] The number and positions of the reinforcement holes 112 in the second well are arranged according to the collapse degree and grouting amount of the reinforcement holes 111 in the first well.

[0036] In this embodiment, a second well reinforcement hole 112 is constructed between two adjacent first well reinforcement holes 111, that is, the first well reinforcement holes 111 and the second well reinforcement holes 112 are staggered. The staggered arrangement can provide a certain supporting force for the soft and broken mudstone layer 400, thereby preventing the soft and broken mudstone layer 400 from moving under the vibration of the drilling hole, thereby causing a hole collapse accident.

[0037] For example, the radial spacing between the center of the second well reinforcement hole 112 and the center of the first well reinforcement hole 111 is 50-100 mm, and the diameters of the second well reinforcement hole 112 and the first well reinforcement hole 111 are 60 mm. For example: the first well reinforcement hole 111 is evenly arranged according to the circumference, A1-A8, a total of 8 holes, the radial spacing between the center of the second well reinforcement hole 112 and the center of the first well reinforcement hole 111 is 50 mm, and the second well reinforcement hole 112 is evenly arranged according to the circumference, B1-B8, a total of 8 holes.

[0038] This embodiment utilizes the in-well reinforcement hole 110 to stabilize the soft broken mudstone layer 400, which greatly reduces the risk of collapse of the first guide hole 130 during the construction process. It not only reduces the equipment damage caused by collapse accidents and ensures the life safety of construction personnel, but also avoids project delays caused by accidents, so that the entire construction process can be efficiently carried out in a safe environment.

[0039] S300. Outside the lower opening of the chute 100, an outer well reinforcement hole 120 is constructed obliquely upward at a preset inclination angle, and after the outer well reinforcement hole 120 is constructed to pass through the soft broken mudstone layer 400, steel strands and threaded steel bars are first inserted, and then the outer well reinforcement hole 120 is grouting.

[0040] In some embodiments, constructing the outside well reinforcement holes 120 includes constructing a first outside well reinforcement hole 121 and a second outside well reinforcement hole 122, and constructing multiple first outside well reinforcement holes 121 in a circular array around the center point of the lower mouth of the chute 100 outside the lower mouth of the chute 100, and then constructing multiple second outside well reinforcement holes 122 in a circular array around the center point of the lower mouth of the chute 100 outside the lower mouth of the chute 100, and the array radius of the second outside well reinforcement holes 122 is greater than the array radius of the first outside well reinforcement holes 121.

[0041] The well reinforcement holes 110 and the well reinforcement holes 120 are constructed parallel to each other at a preset inclination angle, and the well reinforcement holes 110 are constructed first, and then the well reinforcement holes 120 are constructed. It can be understood that this embodiment includes a circle of first well reinforcement holes 111, a circle of second well reinforcement holes 112, a circle of first well reinforcement holes 121 and a circle of second well reinforcement holes 122, a total of four circles of reinforcement holes, and the four circles of reinforcement holes are constructed at an inclination angle of 75° respectively.

[0042] In some other embodiments, the number and arrangement of the in-well reinforcement holes 110 can be flexibly configured, and the number and arrangement of the out-well reinforcement holes 120 can also be flexibly configured, which is not limited here.

[0043] Since the cement slurry in the outer well reinforcement hole 120 does not need to be removed during the later construction process, in order to improve the stability of the cement slurry in the outer well reinforcement hole 120, during the construction of the outer well reinforcement hole 120, steel strands and threaded steel bars are first inserted, and then grouting is carried out. The cement slurry in the outer well reinforcement hole 120 greatly improves the anti-smashing and anti-impact capabilities of the chute 100.

[0044] For example, before grouting, each external reinforcement hole 120 needs to be stuffed with one steel strand and one threaded steel bar, with a total length of 40m. The lap length of the threaded steel bars is not less than 40cm, and the steel strands and threaded steel bars are tied together with lead wire every 2 to 4m.

[0045] Similar to the in-well reinforcement hole 110, a second outside-well reinforcement hole 122 is constructed between two adjacent first outside-well reinforcement holes 121, that is, the first outside-well reinforcement hole 121 and the second outside-well reinforcement hole 122 are staggered. The staggered arrangement can support the well wall of the chute 100 in all directions, thereby ensuring the safety and reliability of the chute 100.

[0046] During construction, according to the principle of interval construction, the odd-numbered holes are constructed first, and then the even-numbered holes. The first well outside reinforcement hole 121 is constructed first, and then the second well outside reinforcement hole 122 is constructed, so as to stabilize the soft and broken mudstone layer 400 to the greatest extent and avoid collapse accidents.

[0047] Exemplarily, the radial distance between the center of the first external reinforcement hole 121 and the wall of the chute 100 is 500-700 mm, and the radial distance between the center of the second external reinforcement hole 122 and the center of the first external reinforcement hole 121 is 300-500 mm.

[0048] For example: the radial distance between the center of the first external reinforcement hole 121 and the wall of the chute 100 is 500 mm, and 16 holes C1 to C16 are evenly arranged according to the circumference; the radial distance between the center of the second external reinforcement hole 122 and the center of the first external reinforcement hole 121 is 300 mm, and 16 holes D1 to D16 are evenly arranged according to the circumference.

[0049] For ease of description and understanding, in this embodiment, the first well reinforcement hole 111, the second well reinforcement hole 112, the first well reinforcement hole 121 and the second well reinforcement hole 122 are collectively referred to as upward holes.

[0050] The diameter of the upward hole is 60-100 mm, for example, the diameters of the first well inner reinforcement hole 111, the second well inner reinforcement hole 112, and the first well outer reinforcement hole 121 are all 80 mm, and the diameter of the second well outer reinforcement hole 122 is 60 mm.

[0051] The length of the upward hole is greater than the distance from the top of the soft broken mudstone layer 400 to the horizontal middle section 101 of the lower opening of the chute, and the vertical length of the upward hole is greater than the vertical distance from the top of the soft broken mudstone layer 400 to the horizontal middle section of the lower opening. For example, if the distance from the top of the soft broken mudstone layer 400 to the horizontal middle section 101 of the lower opening of the chute is 35m, then the length of the upward hole is 40m.

[0052] In some embodiments, the upward hole inclination angle is the same as the preset inclination angle of the chute 100 .

[0053] When constructing upward drilling, use a small amount of water to drill in order to control borehole collapse to the greatest extent possible. If borehole collapse occurs, the drill bit should be withdrawn in time and grouting should be used to seal it, and the hole should be reopened after 48 hours.

[0054] In addition, the grouting pressure of the upward hole shall not be less than 10MPa, the water-cement ratio of the slurry shall be 0.75:1, and the grouting material shall be a high-strength, low-shrinkage composite cement slurry to ensure sufficient grouting volume and reinforcement effect.

[0055] This embodiment significantly improves the smash and impact resistance of the chute 100 through the outer well reinforcement hole 120, so that it can withstand the strong impact force during the falling process of ore, thereby reducing the possibility of cracks, deformation, damage and other problems on the wall of the chute 100, extending the service life of the chute 100 and reducing the high cost caused by frequent maintenance or reconstruction.

[0056] S400. Within the range of the lower mouth of the chute 100, the first guide hole 130 is constructed obliquely upward with the center point of the lower mouth of the chute 100 as the center of the circle, and the first guide hole 130 is constructed to pass through the soft broken mudstone layer 400. After the construction is completed, grouting is injected into the first guide hole 130 and the hole is swept. After the hole is swept, the bottom of the first guide hole 130 is sealed.

[0057] After the first guide hole 130 is drilled, composite cement slurry is injected first, and the hole is swept after the slurry solidifies for 24 hours, and the bottom of the hole is sealed with cement gel solidifier. The sealing length is 2~3m, which serves as a slurry stopping structure during the construction of the second guide hole 140 described later.

[0058] S500. Within the upper opening of the chute 100, a second guide hole 140 is constructed obliquely downward with the center point of the upper opening of the chute 100 as the center of the circle. After the second guide hole 140 is constructed to the first guide hole 130, the cement slurry in the first guide hole 130 is removed and the construction continues downward until the horizontal middle section 101 of the lower opening of the chute is constructed.

[0059] The second guide hole 140 is constructed with a diameter larger than that of the first guide hole 130 , and the first guide hole 130 is located at the center of the second guide hole 140 . Grouting of the first guide hole 130 not only improves the performance of the soft broken mudstone layer 400 , but also provides space and orientation guidance for the construction of the second guide hole 140 .

[0060] To ensure that the second guide hole 140 can smoothly pass through the soft broken mudstone layer 400, during construction, the well reinforcement holes 110 are arranged between the second guide hole 140 and the wall of the chute 100, that is, multiple well reinforcement holes 110 are arranged around the second guide hole 140 to provide support for the second guide hole 140.

[0061] Exemplarily, the radial distance between the center of the first reinforcement hole 111 and the wall of the second guide hole 140 is 100~150mm, and they are evenly arranged according to the circumference. For example, the radial distance between the center of the first reinforcement hole 111 and the wall of the second guide hole 140 is 100mm, and a total of 8 holes A1~A8 are evenly arranged according to the circumference.

[0062] In this embodiment, the first guide hole 130 is constructed in the second guide hole 140 first, and after the drilling of the first guide hole 130 is completed, grouting is first performed and then the hole is swept, and the bottom of the hole is sealed as a grouting stop structure, thereby effectively improving the performance of the soft and broken mudstone layer 400 around the second guide hole 140, providing accurate spatial and azimuthal guidance for the construction of the second guide hole 140, so that the accuracy of the construction of the second guide hole 140 is effectively guaranteed, reducing the correction work due to positioning deviation, and accelerating the construction progress.

[0063] S600. Expand the second guide hole 140 obliquely upward from the horizontal middle section 101 at the lower opening of the chute, and after the construction reaches the horizontal middle section 102 at the upper opening of the chute, the chute 100 is obtained.

[0064] Specifically, the hole expansion construction uses a reverse drilling rig to carry out positive circulation drilling construction.

[0065] This embodiment fundamentally solves the collapse problem faced when constructing the chute 100 through the soft and broken mudstone layer 400 and the poor stability of the chute 100 after construction, and has the characteristics of simple process, safety, high efficiency and good universality.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify 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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