Rapid gob-side entry retaining pier column mold and construction method of supporting wall

Abstract

The invention relates to the technical field of coal mining, and provides a rapid gob-side entry retaining pier column mold and a construction method of a supporting wall, the pier column mold comprises: an outer barrel comprising at least two barrel sections coaxially nested, the barrel sections being in sliding fit in the axial direction, so that the outer barrel can stretch in the axial direction; the flexible mold bag is arranged in the outer barrel, one end of the flexible mold bag is exposed out of the end of the outer barrel, and a pouring opening is formed in the flexible mold bag; and the adjusters are arranged between the adjacent barrel sections and are suitable for positioning the adjacent barrel sections according to the preset length of the outer barrel body. By means of the arrangement, the pier column mold can better adapt to fluctuating roadway heights, the pier column molds of the same specification can be universal in the whole roadway, no extra roof contact medium needs to be adopted for independent roof contact work, construction convenience and roof contact efficiency are improved, meanwhile, zero-clearance complete roof contact of the pier column mold can be achieved, and the bearing performance of the pier column mold is guaranteed; the outer barrel in the contracted state can reduce space occupation in the transportation process, and the transportation efficiency is higher.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a construction method for a rapid gob-side lane retaining pier column mould and a supporting wall. Background Art

[0002] Leaving a tunnel along the goaf is a major way to increase coal recovery rate and implement green mining without coal pillars. It can effectively reduce coal losses and can be used for recovery in the lower section working face. It has many advantages such as reducing tunnel excavation rate, achieving Y-type ventilation, and solving gas accumulation in corners.

[0003] The existing gob-side tunneling technology is mainly divided into two categories: one is to cast a concrete wall on one side of the gob, and the other is to cast a concrete pier on one side of the gob. Both of them replace the traditional coal pillar retention, retain the transportation tunnel of the working face, and provide for the recovery of the working face in the next section.

[0004] Compared with cast concrete walls, steel tube concrete piers combine the advantages of concrete and steel pipes. The external constraint steel pipe of the steel tube concrete pier not only acts as a template during the concrete pouring process, but also provides constraints for the internal concrete, showing more excellent mechanical properties. In addition, steel tube concrete piers have a small filling volume, low filling cost, and fast lane retention speed, so they have been widely used.

[0005] However, due to the inconsistency of the height of underground tunnels, standard-sized external restraint steel pipes are difficult to adapt to the fluctuations in tunnel height. Generally speaking, it is necessary to customize external restraint steel pipes of different lengths according to the changes in tunnel height, or use additional top-joining media to independently perform the top-joining work, resulting in poor convenience in actual construction and low overall top-joining efficiency. In addition, since the external restraint steel pipe is generally rotated and erected, it is limited by the diagonal length, resulting in a certain gap between the external restraint steel pipe and the tunnel roof, making it impossible to completely connect the top. The flexible mold of the pumped concrete will bulge outward from the top gap in the shape of a mushroom head, resulting in the pressure of the pressurized top joint not being too large (the flexible mold will explode if it is too large), which is not conducive to load-bearing. Summary of the invention

[0006] The present invention provides a method for constructing a rapid gob-side tunnel retaining pier column mold and a supporting wall, which is used to solve the defects of poor adaptability of foreign and domestic constraint steel pipes in the prior art and difficulty in complete top connection. It can conveniently and efficiently achieve complete top connection of concrete pier columns and ensure their bearing performance.

[0007] The present invention provides a rapid gob-side lane retaining pier column mold, comprising: The outer cylinder body comprises at least two coaxially nested cylinder segments, wherein the cylinder segments are slidably matched in the axial direction so that the outer cylinder body can be extended and retracted in the axial direction; A flexible mold bag is arranged inside the outer cylinder, and one end of the flexible mold bag is exposed from the end of the outer cylinder, and a pouring port is arranged on the flexible mold bag; The regulator is arranged between adjacent cylinder sections and is suitable for positioning adjacent cylinder sections according to a preset length of the outer cylinder body.

[0008] According to a rapid gob-side lane retaining pier column mold provided by the present invention, the cylinder segment comprises a first cylinder segment and a second cylinder segment, and the first cylinder segment is sleeved outside the second cylinder segment; A plurality of connection sites are provided between the first cylinder segment and the regulator, and the plurality of connection sites are arranged along the axial direction of the first cylinder segment. The regulator and the first cylinder segment can be detachably connected at different connection sites to position the second cylinder segment at different positions of the first cylinder segment along the axial direction.

[0009] According to a fast gob-side lane retaining pier column mold provided by the present invention, the regulator comprises at least a plurality of elastic plates; A plurality of the elastic plates are disposed in the first cylinder segment and arranged in an annular structure around the axis of the first cylinder segment, and the inner diameter of the annular structure is greater than the outer diameter of the second cylinder segment; A barb is provided at one end of the elastic plate facing the first cylinder section, and the barb is bent toward the axial direction of the annular structure.

[0010] According to a rapid gob-side lane retaining pier column mold provided by the present invention, the regulator also includes an annular main body, the other end of the elastic plate relative to the barb is connected to the main body, and a plurality of the elastic plates are connected as a whole via the main body.

[0011] According to a fast gob-side lane retaining pier column mold provided by the present invention, a first positioning hole is provided on the first cylinder section, and a plurality of second positioning holes arranged along the axial direction are provided on the adjuster, and the first positioning hole can correspond to the second positioning holes at different positions respectively with the axial movement of the adjuster, thereby forming a plurality of the connection sites; It also includes a positioning member, which is suitable for passing through the first positioning hole and the second positioning hole in sequence to position the first cylinder section and the regulator.

[0012] According to a rapid gob-side lane retaining pier column mold provided by the present invention, a scale is provided on the adjuster at a position corresponding to the second positioning hole, for displaying the axial length of the outer cylinder corresponding to the second positioning holes at different positions.

[0013] According to a rapid gob-side lane retaining pier column mold provided by the present invention, one end of the first cylinder segment used to cooperate with the second cylinder segment is fixedly connected with a first reinforcement ring; And / or, the outer cylinder is used to fix the exposed end of the flexible mold bag with a second reinforcement ring.

[0014] According to a rapid gob-side lane retaining pier column mold provided by the present invention, one end of the first cylinder segment used to cooperate with the second cylinder segment is the first end, and one end of the second cylinder segment facing the inside of the first cylinder segment is the second end; It also includes a driving structure for driving the second cylinder segment to slide axially relative to the first cylinder segment; the driving structure includes a rope radially penetrating the side of the first end; the rope is slidably matched with the first cylinder segment and supported on the second end.

[0015] According to a rapid gob-side lane retaining pier column mold provided by the present invention, a radial limiting groove is provided on the second end, and the rope can be slidably embedded in the limiting groove.

[0016] According to a rapid gob-side lane retaining pier column mold provided by the present invention, a casting hole corresponding to the position of the casting port is provided on the outer cylinder, the casting hole passes through the second reinforcement ring, and the casting port is led out from the casting hole.

[0017] According to a rapid gob-side lane retaining pier column mould provided by the present invention, the positioning member includes a latch.

[0018] According to a rapid gob-side lane retaining pier column mould provided by the present invention, a radially extending clamping portion is provided on the second reinforcement ring.

[0019] The present invention also provides a construction method for a fast gob-side tunnel retaining support wall, comprising the following steps: Providing any of the above-mentioned rapid gob-side lane retaining pier column molds, and transporting various construction materials to the underground construction location; Hang mesh sealing, hang steel mesh and sealing cloth close to the top of the goaf, and level the construction position; Set up the mold, place the pier column molds in sequence, drive the cylinder segments to move relative to each other so that the outer cylinder body is extended and connected to the top; Pumping concrete into the pier column mold until the flexible mold bag is completely connected to the top; Spray the sealing material and wait for the concrete to solidify to form a load-bearing closed tunnel support wall; Repeat the above steps of hanging mesh sealing, setting up molds, pumping concrete and spraying sealing materials until the construction is completed.

[0020] The method for constructing a fast pier column mold and supporting wall for retaining a lane along the air, by adopting the pier column mold, solves the problems of large filling volume, high filling cost and slow lane retaining speed in the existing wall casting for retaining a lane along the air, and is suitable for large mines with rapidly advancing working faces. By making the cylinder section slide in the axial direction, the outer cylinder can be extended and retracted in the axial direction, thereby adjusting the axial length of the outer cylinder, so that the outer cylinder can better adapt to the fluctuating lane height, and the pier column molds of the same specification can be used universally in all lanes, without the need to customize pier column molds of different lengths, and without the need to use additional top connection media to independently perform top connection work, thereby improving the convenience of construction and the efficiency of top connection; at the same time, after the pier column mold is erected, by adjusting the axial length of the outer cylinder, it can be ensured that the top and bottom ends of the pier column mold are completely in contact with the roof and bottom plates of the lane, achieving zero-gap and complete top connection, and ensuring its bearing performance; in addition, when the pier column mold is transported, the outer cylinder can be in a contracted state, occupying less transportation space, and the single-time transportation efficiency of vehicles with the same volume is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is one of the structural schematic diagrams of the rapid gob-side lane retaining pier column mold in an extended state provided by an embodiment of the present invention.

[0023] Figure 2 This is the second structural schematic diagram of the rapid gob-side lane retaining pier column mold in an extended state provided by an embodiment of the present invention.

[0024] Figure 3 It is a structural schematic diagram of a rapid gob-side lane retaining pier column mold in a compressed state provided by an embodiment of the present invention.

[0025] Figure 4 It is an exploded view of a rapid gob-side lane retaining pier column mold provided by an embodiment of the present invention.

[0026] Figure 5 It is a schematic diagram of the structure of a regulator provided by an embodiment of the present invention.

[0027] Figure 6 This is one of the structural schematic diagrams of the cooperation between the second cylinder section and the regulator in the contracted state of the pier column mold provided by the embodiment of the present invention.

[0028] Figure 7This is the second structural schematic diagram of the cooperation between the second cylinder section and the regulator in the contracted state of the pier column mold provided by the embodiment of the present invention.

[0029] Figure 8 It is one of the structural schematic diagrams of the cooperation between the second cylinder section and the regulator when the pier column mold is in an extended state provided by an embodiment of the present invention.

[0030] Fig. 9 This is the second structural schematic diagram of the cooperation between the second cylinder section and the regulator in the extended state of the pier column mold provided by the embodiment of the present invention.

[0031] Fig.10 The embodiment of the present invention provides Figure 5 A partial enlarged view of part A.

[0032] Fig.11 It is a structural schematic diagram of the cooperation between a forklift and a pier column mold provided by an embodiment of the present invention.

[0033] Fig.12 It is a flow chart of a construction method of a fast gob-side tunnel retaining support wall provided by an embodiment of the present invention.

[0034] Fig.13 It is a top view of the construction effect of the fast gob-side tunnel retaining support wall provided by an embodiment of the present invention.

[0035] Reference numerals: 10. Outer cylinder; 11. First cylinder section; 110. First end; 12. Second cylinder section; 120. Second end; 121. Limiting groove; 13. First reinforcing ring; 14. Second reinforcing ring; 140. Holding part; 141. Casting hole; 20. Flexible mold bag; 200. Casting port; 30. Regulator; 31. Elastic plate; 32. Barb; 33. Main body; 34. Reinforcement part; 35. Second positioning hole; 36. Scale; 40. Drive structure; 41. Rope; 50. Forklift; 60. Goaf; 61. Tunnel; 62. Construction position; 63. Steel mesh and sealing part; 64. Concrete pump; 65. Pumping pipe; 66. Hydraulic unit bracket; 67. Gangue retaining bracket; 68. Transition bracket; 69. End bracket; 70. Area to be mined. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to better understand the construction method of the rapid gob-side lane retaining pier column mold and supporting wall provided by the embodiment of the present invention, its application background is first introduced. The existing gob-side lane retaining technology is mainly divided into two categories, one is to cast a concrete wall on one side of the gob area, and the other is to cast a concrete pier column on one side of the gob area. The external constraint steel pipe of the steel tube concrete pier column can not only act as a template during the concrete pouring process, but also provide constraints for the internal concrete.

[0038] However, due to the inconsistency of the height of underground tunnels, standard-sized external restraint steel pipes are difficult to adapt to the fluctuations in tunnel height. Generally speaking, it is necessary to customize external restraint steel pipes of different lengths according to the changes in tunnel height, or use additional top-joining media to independently perform the top-joining work, resulting in poor convenience in actual construction and low overall top-joining efficiency. In addition, since the external restraint steel pipe is generally rotated and erected, it is limited by the diagonal length, resulting in a certain gap between the external restraint steel pipe and the tunnel roof, making it impossible to completely connect the top. The flexible mold of the pumped concrete will bulge outward from the top gap in the shape of a mushroom head, resulting in the pressure of the pressurized top joint not being too large (the flexible mold will explode if it is too large), which is not conducive to load-bearing.

[0039] In view of the above problems, an embodiment of the present invention provides a method for constructing a rapid goaf-side tunnel retaining pier column mold and a supporting wall, which can conveniently and efficiently achieve complete top connection of the concrete pier column and ensure its bearing performance.

[0040] Combine the following Figure 1-Figure 13 The invention describes a construction method of a rapid gob-side lane retaining pier column mould and a supporting wall.

[0041] Reference Figures 1 to 4 A rapid gob-side lane retaining pier column mold comprises an outer cylinder 10, a flexible mold bag 20 and an adjuster 30; wherein the outer cylinder 10 comprises at least two coaxially nested cylinder segments, and the cylinder segments are slidably matched in the axial direction, so that the outer cylinder 10 can be extended and retracted in the axial direction; the flexible mold bag 20 is arranged inside the outer cylinder 10 and one end is exposed from the end of the outer cylinder 10, and a casting port 200 is arranged on the flexible mold bag 20; the adjuster 30 is arranged between adjacent cylinder segments, and is suitable for positioning adjacent cylinder segments according to a preset length of the outer cylinder 10.

[0042] In actual applications, the use of pier molds solves the problems of large filling volume, high filling cost and slow speed of existing gob-side tunnel wall casting, and is suitable for large mines with fast working face advancement. By making the cylinder section slide in the axial direction, the outer cylinder 10 can be extended and retracted in the axial direction, so that the axial length of the outer cylinder 10 can be adjusted, so that the outer cylinder 10 can better adapt to the fluctuating tunnel height, and the same specification of pier molds can be used in all tunnels 61, without the need to customize pier molds of different lengths, and without the need to use additional top-connecting media to independently carry out top-connecting work, thereby improving the convenience of construction and top-connecting efficiency; at the same time, after the pier mold is erected, by adjusting the axial length of the outer cylinder 10, it can be ensured that the top and bottom ends of the pier mold are completely in contact with the top and bottom plates of the tunnel 61, achieving zero-gap and complete top connection, and ensuring its bearing performance; in addition, when transporting the pier mold, the outer cylinder 10 can be in a contracted state, occupying less transportation space, and the single transportation efficiency of the same volume transport vehicle is higher.

[0043] In some optional embodiments, the specific material of the outer cylinder 10 can be selected according to actual needs, as long as it meets the required structural strength. For example, steel can be used. The specific size specifications of the outer cylinder 10 can be flexibly designed in combination with the actual construction scene, and no specific restrictions are made in the embodiments of the present invention.

[0044] In addition, the outer cylinder 10 can be a polygonal columnar structure or a cylindrical structure, and the outer cylinder 10 can be axially extended and retracted only by enabling the cylinder sections to slide axially. The outer cylinder 10 includes at least two coaxially nested cylinder sections, for example, the outer cylinder 10 can be formed by coaxially nesting two cylinder sections of different diameters, or by coaxially nesting more than three cylinder sections of different diameters. Specifically, the design can be flexibly made in combination with the actual height of the tunnel 61, and the top of the flexible mold bag 20 is exposed from the top of the uppermost cylinder section, and is used for connecting the top after pumping concrete.

[0045] In order to ensure the smoothness of the extension and retraction of the outer cylinder 10 and the convenience of operation, in one embodiment of the present invention, a cylindrical outer cylinder 10 is taken as an example for explanation. The outer cylinder 10 includes two coaxially nested cylinder sections. After the pier column mold is erected, the cylinder section with a larger diameter is located at the bottom, and the cylinder section with a smaller diameter is located at the top.

[0046] For ease of understanding and explanation, in one embodiment of the present invention, the above-mentioned barrel section includes a first barrel section 11 and a second barrel section 12, wherein the inner diameter of the first barrel section 11 is greater than the outer diameter of the second barrel section 12, and is located below the rear pier column mold after erection; the second barrel section 12 is slidably inserted into the first barrel section 11, and is located above the rear pier column mold after erection; and the top end of the flexible mold bag 20 is exposed from the top of the second barrel section 12.

[0047] Specifically, a plurality of connection points are provided between the first cylinder segment 11 and the regulator 30, and the plurality of connection points are arranged along the axial direction of the first cylinder segment 11. The regulator 30 and the first cylinder segment 11 can be detachably connected at different points, so as to adjust the installation position of the regulator 30 in the axial direction of the first cylinder segment 11. The second cylinder segment 12 is positioned by the regulator 30, so as to position the second cylinder segment 12 at different axial positions of the first cylinder segment 11, so as to realize the adjustment of the axial length of the outer cylinder body 10.

[0048] In one embodiment of the present invention, referring to Figure 4 and Figure 5 The regulator 30 includes at least a plurality of elastic plates 31; the plurality of elastic plates 31 are disposed in the first barrel section 11 and are arranged in an annular structure around the axis of the first barrel section 11, and the inner diameter of the annular structure is greater than the outer diameter of the second barrel section 12; a barb 32 is provided at one end of the elastic plate 31 facing the first barrel section 11, and the barb 32 is bent toward the axial direction of the annular structure, and the diameter of the ring formed by the plurality of barbs 32 is smaller than the inner diameter of the second barrel section 12.

[0049] So, refer to Figures 6 to 9 When the second barrel segment 12 is inserted into the first barrel segment 11 through the above-mentioned annular structure, the barb 32 of the elastic plate 31 abuts against the outer wall of the second barrel segment 12, driving the elastic plate 31 to elastically deform in the direction away from the axis of the first barrel segment 11. When the second barrel segment 12 slides along the axial direction of the first barrel segment 11 so that the bottom end of the second barrel segment 12 completely enters the above-mentioned annular structure, the barb 32 disengages from the outer wall of the second barrel segment 12, thereby restoring the deformation in the axial direction of the first barrel segment 11. The barb 32 is hooked and supported on the bottom end of the second barrel segment 12 to maintain the stability of the second barrel segment 12, thereby realizing the positioning of the second barrel segment 12.

[0050] In one embodiment of the present invention, the regulator 30 further includes an annular main body 33, the inner diameter of the main body 33 is larger than the outer diameter of the second barrel section 12, preferably matched with the diameter of the annular structure, the other end of the elastic plate 31 relative to the barb 32 is connected to the main body 33, a plurality of elastic plates 31 are connected as a whole via the above-mentioned main body 33, and the annular structure formed by the plurality of elastic plates 31 is coaxial with the main body 33. Such an arrangement can facilitate the connection of the regulator 30 with the first barrel section 11 and the adjustment of the connection position.

[0051] The size specifications of the regulator 30 can be flexibly designed according to the size specifications of the outer cylinder 10. There is no specific limitation in the embodiment of the present invention. The specific material, thickness and molding method of the regulator 30 can be selected according to actual needs, such as the required support strength.

[0052] In one embodiment of the present invention, the regulator 30 is integrally formed. Specifically, a ring-shaped member having a thickened bottom end and a barbed shape can be divided equidistantly along the circumferential direction by a plurality of square holes, thereby forming the above-mentioned ring-shaped regulator 30.

[0053] In one embodiment of the present invention, one end of the regulator 30 away from the barb 32 is thickened to form an annular reinforcement portion 34 to improve the strength and annular restraint capability of the regulator 30 .

[0054] In order to facilitate the adjustment of the connection position of the regulator 30 at the first barrel section 11, in one embodiment of the present invention, Figure 4 and 10 The first cylinder section 11 is provided with a first positioning hole, and the regulator 30 is provided with a plurality of second positioning holes 35 arranged along the axial direction. The first positioning hole can correspond to the second positioning holes 35 at different positions respectively with the axial movement of the regulator 30, thereby forming the above-mentioned multiple connection sites. The pier column mold also includes a positioning member, which is suitable for passing through the first positioning hole and the second positioning hole 35 in sequence, so as to position the first cylinder section 11 and the regulator 30.

[0055] In actual applications, the adjuster 30 can be slid axially according to the preset length of the outer cylinder 10, so that the first positioning hole on the first cylinder section 11 corresponds to the second positioning hole 35 at a specific position on the adjuster 30, and then the positioning piece is used to pass through the first positioning hole and the second positioning hole 35 in sequence to position the first cylinder section 11 and the adjuster 30, so as to adjust the position of the adjuster 30 on the first cylinder section 11. After the adjuster 30 is adjusted to a predetermined position, the second cylinder section 12 is pulled axially by a forklift 50 or other equipment to slide the second cylinder section 12 axially. When the bottom end of the second cylinder section 12 enters the inside of the adjuster 30, the elastic plate 31 of the adjuster 30 restores its deformation toward the axial direction of the first cylinder section 11, so that the barb 32 is hooked and supported on the bottom of the second cylinder section 12, so as to axially position the second cylinder section 12, thereby adjusting the preset length of the outer cylinder 10.

[0056] Specifically, a plurality of first positioning holes are arranged around the axis of the first barrel section 11, and a plurality of second positioning holes 35 are arranged in groups along the axial direction of the regulator 30, and a plurality of second positioning holes 35 in each group are arranged around the regulator 30. The plurality of first positioning holes and second positioning holes 35 improve the stability of the connection of the regulator 30 on the first barrel section 11.

[0057] In one embodiment of the present invention, the positioning member may be a latch, which is used to sequentially pass through the first positioning hole and the second positioning hole 35 to achieve connection between the first barrel section 11 and the regulator 30 .

[0058] In one embodiment of the present invention, a scale 36 is provided at a position corresponding to the second positioning hole 35 on the adjuster 30, for displaying the axial length of the outer cylinder 10 corresponding to the second positioning holes 35 at different positions. Specifically, when the position of the adjuster 30 is adjusted along the axial direction, different scales 36 will be exposed along the second positioning holes 35 to expose the first cylinder section 11, and each scale 36 represents the axial length of the outer cylinder 10 in the extended state. The staff only needs to obtain the length of the outer cylinder 10 through the scale 36, which omits the measurement work, saves work steps, and reduces work intensity.

[0059] In one embodiment of the present invention, the first cylinder segment 11 is used to cooperate with one end of the second cylinder segment 12 and is fixedly connected with a first reinforcement ring 13. The first reinforcement ring 13 can increase the structural strength and annular restraint force of the top end of the first cylinder segment 11.

[0060] In some optional embodiments, the first reinforcement ring 13 can be fixedly connected to the outer periphery of the first cylinder section 11 by welding, or by connecting components such as rivets and bolts. The specific selection can be made according to actual needs.

[0061] Specifically, the position of the first reinforcement ring 13 corresponds to the position of the first positioning hole, and the first positioning hole passes through the first reinforcement ring 13 and the cylinder wall of the first cylinder segment 11 in sequence.

[0062] In one embodiment of the present invention, one end of the second cylinder segment 12 for the flexible mold bag 20 to pass through is fixedly connected to a second reinforcement ring 14. By providing the second reinforcement ring 14, the structural strength of the top end of the second cylinder segment 12 can be increased, thereby enhancing the stability and annular constraint force of the second cylinder segment 12, and effectively avoiding the problem of the top of the pier column being compressed and bursting.

[0063] In some optional embodiments, the second reinforcement ring 14 can be fixedly connected to the outer periphery of the second cylinder section 12 by welding, or by connecting components such as rivets and bolts, and the specific selection can be made according to actual needs.

[0064] Specifically, refer to Fig.11 The second reinforcement ring 14 extends radially at one end away from the first cylinder segment 11 to form a clamping portion 140. The clamping portion 140 can provide a fulcrum for equipment such as a forklift 50, so as to facilitate the axial movement of the second cylinder segment 12 with the help of equipment such as a forklift 50 to adjust the axial length of the outer cylinder body 10.

[0065] In one embodiment of the present invention, a pouring hole 141 is provided on the outer cylinder 10 at a position corresponding to the pouring port 200. The pouring hole 141 penetrates the second reinforcement ring 14. The pouring port 200 is led out from the pouring hole 141 to facilitate pumping concrete into the flexible mold bag 20 of the pier column mold through the pouring port 200.

[0066] In actual work, according to the preset length of the outer cylinder 10, the position of the adjuster 30 is adjusted axially. After the adjuster 30 is adjusted to the preset position, a forklift 50 or other equipment can be used to apply force to the clamping portion 140 at the top of the second reinforcement ring 14 to pull the second cylinder section 12 to slide axially. After adjusting to the predetermined position, the barb 32 of the adjuster 30 is hooked and supported on the bottom of the second cylinder section 12 to axially position the second cylinder section 12, thereby adjusting the preset length of the outer cylinder 10, and then concrete is pumped into the pier mold through the pouring port 200 until the flexible mold bag 20 is completely connected to the top.

[0067] However, due to the complex construction environment of the underground tunnel 61, it is sometimes difficult for large-scale operating equipment such as a forklift 50 to operate in the tunnel 61, resulting in difficulty in adjusting the height of the pier column mold.

[0068] In order to solve the above problem, in one embodiment of the present invention, referring to Figure 4 and Figure 6 The pier column mold further includes a driving structure 40 for driving the second cylinder segment 12 to slide axially relative to the first cylinder segment 11. Specifically, the end of the first cylinder segment 11 for matching the second cylinder segment 12 is the first end 110, and the end of the second cylinder segment 12 facing the inside of the first cylinder segment 11 is the second end 120; the driving structure 40 includes a rope 41 that radially penetrates the side of the first end 110, and the rope 41 is slidably matched with the first cylinder segment 11 and supported on the second end 120.

[0069] In practical applications, the rope 41 can be pulled manually or by using winding equipment such as a winch. During the pulling process of the rope 41, the portion of the rope 41 located inside the first barrel segment 11 will move toward the first end 110 of the first barrel segment 11 (i.e., the top of the first barrel segment 11), thereby dragging the second end 120 of the second barrel segment 12 toward the first end 110 of the first barrel segment 11, causing the second barrel segment 12 to slide axially relative to the first barrel segment 11, thereby achieving axial extension of the outer barrel body 10.

[0070] In some optional embodiments, the rope 41 may penetrate the two opposite sides of the first end 110 in the radial direction, so that the second cylinder segment 12 can be dragged to slide in the axial direction by applying force to both ends of the rope 41. It is also possible to make one end of the rope 41 penetrate one side of the first end 110 in the radial direction, and the other end is fixedly connected to the first cylinder segment 11, so that the second cylinder segment 12 can be dragged to slide in the axial direction by only applying force to one end of the rope 41. In addition, the rope 41 can be arranged in one piece, or two or more ropes can be arranged in a cross pattern. The rope 41 can be made of steel wire rope or other materials that meet the required support strength, and the specific selection can be made according to actual needs.

[0071] In this embodiment, the rope 41 is a steel wire rope, one end of which is fixedly connected to the first cylinder segment 11 , and the other end of which radially penetrates one side of the first end 110 .

[0072] In one embodiment of the present invention, a radial limiting groove 121 is provided on the second end 120, and the rope 41 is slidably embedded in the limiting groove 121. The limiting groove 121 can limit the rope 41 to prevent the rope 41 from swinging in the radial direction during the pulling process, so that the supporting force of the rope 41 is always located in the middle position of the bottom of the second cylinder section 12, ensuring that the second cylinder section 12 is evenly stressed, and improving the smoothness and stability of the sliding of the second cylinder section 12.

[0073] Specifically, the limiting groove 121 axially penetrates the second end 120 of the second cylinder section 12 , so that the rope 41 cooperates with the limiting groove 121 .

[0074] It is to be understood that, without mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification.

[0075] The following describes the construction method of the rapid gob-side lane retaining support wall provided by the present invention. The construction method of the rapid gob-side lane retaining support wall described below and the rapid gob-side lane retaining pier column mold described above can be referenced to each other.

[0076] Reference Fig.12 and Fig.13 A method for constructing a fast gob-side tunnel retaining support wall comprises the following steps: Step S10, providing a rapid gob-side lane retaining pier column mold as described in any of the above embodiments, and transporting various construction materials to an underground construction location 62.

[0077] Specifically, after the various components of the pier column mold are manufactured in the factory, they are assembled on the ground to form the pier column mold, and then the pier column mold, steel mesh, sealing cloth and other construction materials are transported to the construction position 62 of the underground tunnel 61.

[0078] Step S11, mesh sealing, hang steel mesh and sealing cloth along the top of the goaf 60, and level the construction position 62.

[0079] Step S12, erecting the mold, placing the pier column molds in sequence, driving the cylinder segments to move relative to each other so that the outer cylinder body 10 is extended and connected to the top.

[0080] Specifically, after the pier column molds are placed in sequence, they are lifted by a forklift 50 to extend and connect the outer cylinder 10; or they are reeled in by manual pulling or winding equipment such as a winch to pull the wire rope 41 to extend and connect the outer cylinder 10.

[0081] Step S13: pumping concrete into the pier column mold until the flexible mold bag 20 is completely connected to the top.

[0082] Specifically, the concrete pump 64 is connected to the pouring port 200 through the pumping pipe 65, and concrete is pumped into the flexible form bag 20 through the pouring port 200 until the flexible form bag 20 is completely topped.

[0083] Step S14, spraying sealing material, and forming a load-bearing closed lane support wall after the concrete solidifies.

[0084] Step S15, repeat the above steps S11 to S14 until the construction is completed.

[0085] Specifically, refer to Fig.13 The arrow in the figure indicates the advancing direction of the working face. As the working face advances toward the area to be mined 70, a new goaf 60 is formed in the area that has been mined at the rear. After a certain distance of construction, the hydraulic unit support 66, the gangue retaining support 67, the transition support 68 and the end support 69 are moved forward, and the above steps of hanging mesh sealing, setting up molds, pumping concrete and spraying sealing materials are repeated until the construction is completed.

[0086] It should be pointed out that the hydraulic unit support 66, the gangue retaining support 67, the transition support 68 and the end support 69 and other equipment are all commonly used support equipment in coal mines. Their specific structure and working principle can refer to the prior art. These support equipment are not the main invention points of the present invention, and these support equipment are not improved in the embodiments of the present invention, so they will not be described in detail.

[0087] The method for constructing a fast gob-side lane retaining pier column mold and a supporting wall provided by the embodiment of the present invention adopts a pier column mold, which solves the problems of large filling volume, high filling cost and slow lane retaining speed in the existing gob-side lane retaining wall casting, and is suitable for large mines with fast working face advancement. By making the cylinder section slide in the axial direction, the outer cylinder 10 can be extended and retracted in the axial direction, so as to adjust the axial length of the outer cylinder 10, so that the outer cylinder 10 can better adapt to the fluctuating lane height, and the pier column mold of the same specification can be used in all lanes 61, without the need to customize pier column molds of different lengths, and without the need to use additional top connection media to independently perform top connection work, thereby improving the convenience of construction and top connection efficiency; at the same time, after the pier column mold is erected, by adjusting the axial length of the outer cylinder 10, it can be ensured that the top and bottom ends of the pier column mold are completely in contact with the top plate and bottom plate of the lane 61, and zero gap and complete top connection are achieved to ensure its bearing performance; in addition, when the pier column mold is transported, the outer cylinder 10 can be in a contracted state, occupying less transportation space, and the single transportation efficiency of the same volume transportation vehicle is higher.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid gob-side lane retaining pier column mould, characterized in that: include: The outer cylinder (10) comprises at least two coaxially nested cylinder segments, wherein the cylinder segments are slidably matched in the axial direction, so that the outer cylinder (10) can be extended and retracted in the axial direction; A flexible mold bag (20) is arranged inside the outer cylinder (10) and one end of which is exposed from the end of the outer cylinder (10). A pouring port (200) is provided on the flexible mold bag (20); The regulator (30) is arranged between adjacent cylinder sections and is suitable for positioning adjacent cylinder sections according to a preset length of the outer cylinder body (10).

2. The rapid gob-side lane retaining pier column mold according to claim 1 is characterized in that: The cylinder segment comprises a first cylinder segment (11) and a second cylinder segment (12), wherein the first cylinder segment (11) is sleeved outside the second cylinder segment (12); A plurality of connection points are provided between the first cylinder section (11) and the regulator (30), and the plurality of connection points are arranged along the axial direction of the first cylinder section (11). The regulator (30) and the first cylinder section (11) can be detachably connected at different connection points, so as to position the second cylinder section (12) at different positions of the first cylinder section (11) along the axial direction.

3. The rapid gob-side lane retaining pier column mold according to claim 2 is characterized in that: The regulator (30) comprises at least a plurality of elastic plates (31); A plurality of elastic plates (31) are disposed in the first cylinder section (11) and are arranged around the axis of the first cylinder section (11) to form an annular structure, wherein the inner diameter of the annular structure is greater than the outer diameter of the second cylinder section (12); A barb (32) is provided at one end of the elastic plate (31) facing the first cylindrical section (11), and the barb (32) is bent toward the axial direction of the annular structure.

4. The rapid gob-side lane retaining pier column mold according to claim 3 is characterized in that: The regulator (30) further comprises an annular main body (33), the other end of the elastic plate (31) relative to the barb (32) is connected to the main body (33), and a plurality of the elastic plates (31) are connected as a whole via the main body (33).

5. The rapid gob-side lane retaining pier column mold according to any one of claims 1 to 4, characterized in that: The first cylinder section (11) is provided with a first positioning hole, and the regulator (30) is provided with a plurality of second positioning holes (35) arranged along the axial direction, and the first positioning hole can correspond to the second positioning holes (35) at different positions respectively as the regulator (30) moves axially, thereby forming a plurality of connection sites; It also comprises a positioning member, which is suitable for passing through the first positioning hole and the second positioning hole (35) in sequence, and is used for positioning the first cylinder section (11) and the regulator (30).

6. The rapid gob-side lane retaining pier column mold according to claim 5 is characterized in that: The position of the adjuster (30) corresponding to the second positioning hole (35) is provided with a scale (36) for displaying the axial length of the outer cylinder (10) corresponding to the second positioning hole (35) at different positions.

7. The rapid gob-side lane retaining pier column mold according to claim 3 is characterized in that: One end of the first cylinder section (11) used to cooperate with the second cylinder section (12) is fixedly connected with a first reinforcement ring (13); And / or, the outer cylinder (10) is used to fix the exposed end of the flexible mold bag (20) with a second reinforcement ring (14).

8. The rapid gob-side lane retaining pier column mold according to claim 2 is characterized in that: An end of the first barrel section (11) used to match the second barrel section (12) is a first end (110), and an end of the second barrel section (12) facing the inside of the first barrel section (11) is a second end (120); It also includes a driving structure (40) for driving the second cylinder segment (12) to slide axially relative to the first cylinder segment (11); the driving structure (40) includes a rope (41) radially penetrating the side of the first end (110); the rope (41) is slidably matched with the first cylinder segment (11) and supported on the second end (120).

9. The rapid gob-side lane retaining pier column mold according to claim 8 is characterized in that: The second end (120) is provided with a radial limiting groove (121), and the rope (41) is slidably embedded in the limiting groove (121).

10. A method for constructing a fast gob-side tunnel retaining support wall, characterized in that: The following steps are involved: Providing a rapid gob-side lane retaining pier column mold as described in any one of claims 1 to 9, and transporting various construction materials to an underground construction location (62); Hanging mesh sealing, hanging steel mesh and sealing cloth along the top of the goaf (60), and leveling the construction position (62); The mold is erected, and the pier column molds are placed in sequence, and the cylinder segments are driven to move relative to each other so that the outer cylinder (10) is extended and connected to the top; Pumping concrete into the pier column mold until the flexible mold bag (20) is completely connected to the top; Spray the sealing material and wait for the concrete to solidify to form a load-bearing closed tunnel support wall; Repeat the above steps of hanging mesh sealing, setting up molds, pumping concrete and spraying sealing materials until the construction is completed.

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