Gongru unit template support device for gob-side entry retaining and construction method

Abstract

The application discloses a rigid-flexible unit formwork support device and a construction method for gob-side entry retaining, the device comprises a unit formwork and a flexible bag, the unit formwork comprises upper two-wing formworks and lower two-wing formworks which are vertically arranged, folding formworks are provided with unit hydraulic supports on one side, the upper two-wing formworks slide up and down relative to the lower two-wing formworks through the unit hydraulic supports, and the upper two-wing formworks are further connected with the flexible bag for preventing slurry leakage. The method is that a plurality of unit formworks are arranged at equal intervals along a direction of a gob-side entry, the unit formworks are located on one side of a goaf, the flexible bag is hung on the top of the unit formwork, a top beam is lifted through a hydraulic column, and the roof of the gob-side entry is supported; filling materials are poured and filled to form a roadside wall, after the filling materials are solidified, the unit formwork is removed, and concrete is sprayed to the adjacent roadside wall. The application has the characteristics of fast processing, low cost, good forming, integration of the formwork and support, high mechanization degree and the like, and does not affect the pushing and mining speed.

Description

Technical Field

[0001] This invention belongs to the field of coal pillarless mining technology, specifically relating to a rigid-flexible unit formwork support device for roadway retention along the goaf, and also to a construction method for the above-mentioned formwork support device. Background Technology

[0002] Goaf roadways are a major form of pillarless mining, serving multiple purposes including coal pillar recovery, reduced roadway excavation, easing tensions between mining and excavation, enabling Y-shaped ventilation, preventing water hazards in the goaf, and reducing pressure to maintain roadway stability. Over the past 20 years, goaf roadway technology has made significant progress, with its application in an increasing number of mines, yielding substantial safety, economic, and social benefits.

[0003] Currently, the main methods used in my country for gob-side tunneling include roof-cutting self-contained tunneling technology, high-water-content material gob-side tunneling technology, flexible-formwork concrete gob-side tunneling technology, and shotcrete gob-side tunneling technology. With the upgrading of support and transportation equipment, the technical approach of using permanent closure support of the roadway side walls combined with temporary support of unit hydraulic supports inside the roadway is increasingly recognized by engineering technicians.

[0004] The technical requirements for permanent enclosure support of the alleyway wall, combined with temporary support using unit hydraulic supports within the alley, necessitate wall pouring. Wall pouring requires formwork, and three types of formwork are commonly used. The first type uses flexible formwork with transverse bracing, but this requires high bracing density, high cost, and slow processing, making it unsuitable for large-scale production. The second type uses flexible formwork without bracing, but this requires individual units and wooden support columns for enclosure, resulting in high cost, poor forming quality, and high labor intensity, due to the fluidity of the filling material within the flexible formwork. In the dynamic state, when the roadway is high, the lateral pressure on the individual units and wooden supports is very large, making them prone to tilting and bending, which is not suitable for high-extraction working faces; the third type is the form of using end supports and filling bags. This form has some engineering applications, but they are all forward dragging type, that is, the end support at the end of the roadway has a U-shaped device at the end, and the U-shaped device uses filling bags. Because the length of the filling space inside the U-shaped device is limited, generally 3m, and the concrete solidifies slowly, it cannot be demolded in time, and the wall pouring affects production, which does not meet the need for rapid pushing mining of 10-20m per day. Summary of the Invention

[0005] The purpose of this invention is to provide a rigid-flexible unit template support device for roadway retention along the goaf. It has the advantages of fast processing of flexible bags and low cost. At the same time, it is well formed with hydraulic supports, and the template and support are integrated. It has a high degree of mechanization, low labor intensity for workers, and does not affect the mining speed.

[0006] Another objective of this invention is to provide a construction method for a rigid-flexible unit formwork support device for roadway retention.

[0007] The first technical solution adopted in this invention is a rigid-flexible unit template support device for gob-side roadway retention, including a unit template frame and a flexible bag. The unit template frame includes interconnected folding templates. The folding template is composed of upper two-wing templates and lower two-wing templates arranged vertically. The upper two-wing templates are overlaid on the outside of the lower two-wing templates. A unit hydraulic support is provided on one side of the folding template. The long side of the unit hydraulic support is connected to the folding template. The upper two-wing templates slide up and down relative to the lower two-wing templates through the unit hydraulic support.

[0008] The unit hydraulic support includes an inverted T-shaped base, with two hydraulic columns fixedly connected vertically to the top of the base, and a top beam fixedly connected to the end of the two hydraulic columns away from the base.

[0009] The upper two-wing formwork includes the upper main formwork, which is connected to the long side of the top beam. The upper two-wing formwork is movably connected to both sides of the upper main formwork, and the upper two-wing formwork rotates along the adjacent sides of the upper main formwork.

[0010] The lower two-wing template includes a lower main template, which is connected to the long side of the base. The lower two-wing template is movably connected to both sides of the lower main template. The lower two-wing template rotates along the adjacent sides of the lower main template.

[0011] The top of the upper two wing templates is also connected to flexible bags for preventing grout leakage. The flexible bags are rectangular in shape and are made of woven microporous fiber cloth. Perforated hanging strips are set on the short sides of the flexible bags adjacent to the upper two wing templates. There are 3 to 10 equally spaced through holes on the perforated hanging strips. Clamping hanging strips are set on the long side of the flexible bags adjacent to the upper main template. Vertical hanging columns corresponding to the through holes on the perforated hanging strips are vertically fixed to the top of the upper two wing templates along the side length direction. These columns are used to penetrate the holes in the perforated hanging strips to hang the flexible bags.

[0012] The first technical solution of the present invention is further characterized in that,

[0013] The upper and lower main templates are rectangular in shape. There are notches on both sides of the top of the upper main template, and the flexible bag is provided with an injection port at the position of the notch.

[0014] Telescopic guide columns are also vertically installed between the top beam and the base.

[0015] The upper two wing templates are fitted inside the lower two wing templates.

[0016] The lengths of the top beam and the base are less than the lengths of the upper main formwork and the lower main formwork, respectively.

[0017] Several nylon straps are installed on the side of the flexible bag away from the unit hydraulic support. The nylon straps are evenly spaced horizontally from top to bottom. The two ends of the nylon straps are connected to the folding template to control the length of the internal space enclosed by the folding template and reduce the amount of bulging of the flexible bag on the goaf side.

[0018] The second technical solution adopted in this invention is a construction method for a rigid-flexible unit formwork support device for roadway retention along the goaf, comprising the following steps:

[0019] Step 1: After the coal is cut and mined by the coal mining machine, the end support of the roadway is moved, and the rock-blocking device behind the end support is moved forward and rock-blocking support is provided. The above operation is repeated to form a 3m to 6m long cast-in-place wall space on the goaf side behind the end support.

[0020] Step 2: Move the unit formwork behind the goaf roadway forward to the position of the wall to be poured on the side of the rock retaining device using the support transport vehicle. Open the upper two wing formwork and the lower two wing formwork to point towards the goaf area. Then adjust the unit formwork to the position of the wall to be poured using the support transport vehicle.

[0021] Step 3: Hang the flexible bag through the unit mold frame, insert the through holes of the perforated hanging strips at both ends of the flexible bag into the vertical hanging column, and then lay the clamping hanging strips on the side of the flexible bag flat on the top beam.

[0022] Step 4: The top beam is raised by hydraulic columns, so that the support force of the top beam on the roof of the goaf roadway is clamped and the hanging cloth strip is held. The hanging cloth strip with holes is hung by vertical hanging columns at both ends. The folding template is adjusted to form a cuboid filling space, and the two ends of the nylon strip are fixed to the folding template.

[0023] Step 5: Repeat steps 1 to 4 to complete the installation of 2 to 6 rigid-flexible unit formwork support devices, with all rigid-flexible unit formwork support devices located in a straight line.

[0024] Step 6: Inject filling material into the flexible bag through the injection port via the delivery pipe until the top is full, forming a discontinuous wall along the alley;

[0025] Step 7: When the filling material has solidified to the set strength, untie the nylon straps, lower the top beam through the hydraulic column, use the support transport vehicle to move the unit formwork horizontally and pull it out, fold and retract the two wings of the folded template, and push back the side support roof plate of the alleyway wall. When the unit formwork is needed, it can be moved by the support transport vehicle.

[0026] Step 8: Use shotcrete to spray concrete between the discontinuous walls along the alley to fill the gaps between adjacent walls.

[0027] The beneficial effects of this invention are:

[0028] The present invention relates to a rigid-flexible unit template support device for roadway entry and exit, which combines a unit hydraulic support, two-wing folding templates, and a flexible bag. The combination of the unit hydraulic support and the two-wing folding templates forms a unit template frame, which has both the support function of the unit hydraulic support and the function of the rigid template. The combination of the unit template frame and the flexible bag forms a rigid-flexible unit template support device, with the flexible bag acting as a flexible inner tube and the unit template frame acting as a rigid outer tube, achieving a unified solution for preventing grout leakage and supporting the formation.

[0029] More importantly, the construction method of the rigid-flexible unit formwork support device for gob-side roadway retention in this invention, by adopting the method of lateral arrangement of unit formwork and lateral extraction of unit formwork, eliminates the constraints on the solidification time and demolding time of the wall on the mining speed. This is because the length of gob-side roadway delayed support using unit hydraulic supports is generally around 150-200m, and there is no need for immediate demolding. The demolding time can be delayed by more than 10 days. After the wall reaches a certain strength, the unit formwork is extracted from the rear and transported forward using a support transport vehicle. This allows for cyclical temporary support and serves as a template, meeting the needs of cost reduction and efficiency improvement, rapid mining, efficient roadway retention, and safe support. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the rigid-flexible unit template support device for roadway retention according to the present invention;

[0031] Figure 2 This is a schematic diagram of the unit template frame in the rigid-flexible unit template support device for roadway retention according to the present invention;

[0032] Figure 3 This is a schematic diagram of the unit hydraulic support in the rigid-flexible unit template support device for gob-side roadway retention of the present invention;

[0033] Figure 4 This is a schematic diagram of the flexible bag structure in the rigid-flexible unit template support device for roadway retention of the present invention;

[0034] Figure 5 This is a schematic diagram of the folding template in the rigid-flexible unit template support device for roadway retention according to the present invention;

[0035] Figure 6 This is a construction diagram illustrating the construction method of the rigid-flexible unit template support device for roadway retention according to the present invention.

[0036] In the diagram, 1. Unit formwork, 2. Flexible bag, 3. Unit hydraulic support, 31. Top beam, 32. Hydraulic column, 33. Base; 4. Folding template, 41. Upper wing template, 411. Upper main template, 412. Upper wing template, 413. Vertical hanging column, 42. Lower wing template, 421. Lower main template, 422. Lower wing template; 5. Clamping and hanging strip, 6. Hanging strip with holes, 7. Injection port, 8. Nylon belt, 9. Support transport vehicle, 10. Roadway, 11. Goaf roadway, 12. End support, 13. Goaf area, 14. Rock retaining device, 15. Wooden support post. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] like Figure 1 As shown, the rigid-flexible unit template support device for gob-side roadway retention of the present invention includes a unit template 1 and a flexible bag 2, as shown. Figure 2 As shown, the unit mold frame 1 includes interconnected folding templates 4. The folding template 4 is composed of upper two-wing templates 41 and lower two-wing templates 42 arranged vertically. The upper two-wing templates 41 overlap with the lower two-wing templates 42, specifically, the upper two-wing templates 41 are wrapped around the outer / inner side of the lower two-wing templates 42.

[0040] A unit hydraulic support 3 is provided on one side of the folding template 4. The unit hydraulic support 3 is connected to the upper two-wing template 41 and the lower two-wing template 42, and the upper two-wing template 41 is controlled to slide up and down relative to the lower two-wing template 42 through the unit hydraulic support 3.

[0041] like Figure 3 As shown, the unit hydraulic support 3 includes an inverted T-shaped base 33, with a hydraulic column 32 vertically fixed to the top of the base 33. In this embodiment, a pair of hydraulic columns 32 are used to improve the stability of the top beam 31 when it is raised or lowered. The top of the base 33 is connected to the hydraulic column 32, and the top beam 31 is fixedly connected to the end of the hydraulic column 32 away from the base 33.

[0042] When the top beam 31 needs to be raised to a high height, in order to ensure the stability of the top beam 31 during lifting, a telescopic guide column is also vertically installed between the top beam 31 and the base 33. The telescopic guide column assists the top beam 31 in lifting operations, which greatly improves the operational stability.

[0043] like Figure 5As shown, the upper two-wing template 41 includes an upper main template 411, which is connected to the top beam 31. The upper main template 411 is movably connected to the upper two-wing template 412 on both sides. Specifically, the upper two-wing template 412 is hinged to the upper main template 411, so that the upper two-wing template 412 can rotate along the adjacent side of the upper main template 411, that is, rotate about the hinge point as the vertical axis.

[0044] The lower two-wing template 42 includes a lower main template 421, which is connected to the base 33. The lower main template 421 is movably connected to the two lower wing templates 422 on both sides. Similarly, the two lower wing templates 422 are hinged to the lower main template 421, and the two lower wing templates 422 rotate along the vertical axis at the hinge point with the lower main template 421.

[0045] By rotating the upper two-wing template 412 and the lower two-wing template 422, the folded template 4 is used to enclose a rectangular space. When the height of the wall to be poured is low, the upper two-wing template 412 and the lower two-wing template 422 are aligned and fixedly connected, and at the same time the connection between the upper two-wing template 412 and the upper main template 411 is released. That is, the upper main template 411 is only fixedly connected to the top beam 31 and moves up and down with the top beam 31.

[0046] Furthermore, the upper main template 411 and the lower main template 421 are rectangular in shape. The upper main template 411 has notches on both sides of the top, and the flexible bag 2 has an injection port 7 at the position opposite to the notch. The length of the top beam 31 and the base 33 is less than the length of the upper main template 411 and the lower main template 421, and the sum of the heights of the upper main template 411 and the lower main template 421 is greater than the height of the goaf 11, so as to avoid gaps between the upper main template 411 and the lower main template 421 as the upper main template 411 moves upward.

[0047] The top of the upper two-wing template 41 is also connected to a flexible bag 2. The unit template 1 and the flexible bag 2 are combined with the inner flexible and outer rigid to form the device of the present invention. The flexible bag 2 prevents slurry leakage, the unit template 1 maintains the shape, and at the same time plays a temporary support role without affecting the mining progress.

[0048] like Figure 4 As shown, the flexible bag 2 is in the shape of a cuboid. The two short sides of the upper two wing templates 412 adjacent to the flexible bag 2 are respectively provided with perforated hanging strips 6, and the perforated hanging strips 6 have several through holes arranged at equal intervals. The long side of the upper main template 411 adjacent to the flexible bag 2 is provided with clamping hanging strips 5.

[0049] Several vertical hanging posts 413 are vertically fixedly connected to the top of the upper two wing templates 412 along the side length extension direction. The vertical hanging posts 413 are set at equal intervals, and the number and spacing of the vertical hanging posts 413 correspond to the through holes on the perforated hanging strips 6. When connecting the flexible bag 2 and the folding template 4, the through holes on the perforated hanging strips 6 are aligned with the vertical hanging posts 413, and the vertical hanging posts 413 are passed through the perforated hanging strips 6 to complete the hanging of the flexible bag 2.

[0050] To prevent the filling material from pushing the upper two wing templates 412 and the lower two wing templates 422 during filling and changing the length of the cuboid formed by the folded template 4, several nylon straps 8 are provided on the side of the flexible bag 2 away from the unit hydraulic support 3. The nylon straps 8 are evenly spaced horizontally from top to bottom, and both ends of the nylon straps 8 are connected to the folded template 4 to control the length of the internal space enclosed by the folded template 4.

[0051] The two ends of the nylon strap 8 can also be fixed to the corresponding upper main body template 411 or lower main body template 421, or to the connecting pin position of the upper and lower layers.

[0052] Example 2

[0053] like Figure 6 As shown, the construction method of the rigid-flexible unit formwork support device for gob-side entry retention of the present invention includes the following steps:

[0054] Step 1: After the coal is cut and mined by the coal mining machine, the end support 12 at the roadway is moved, and the rock-blocking device 14 behind the end support 12 is moved forward and rock-blocking support is provided. The production operation is carried out according to the above procedures to create a safe pouring wall space of about 3 to 6 meters in length on one side of the goaf 13 behind the end support 12.

[0055] Step 2: Move the unit formwork 1 behind the goaf roadway 11 forward to the position of the wall to be poured on the side of the rock blocking device 14 using the support transport vehicle 9. Open the upper two wing formwork 412 and the lower two wing formwork 422 to point towards the goaf area 13. Then adjust the unit formwork 1 to the position of the wall to be poured using the support transport vehicle 9.

[0056] Step 3: Hang the flexible bag 2 through the unit mold frame 1, insert the through holes of the perforated hanging strips 6 at both ends of the flexible bag 2 into the vertical hanging column 413, and then lay the clamping hanging strips 5 on the side of the flexible bag 2 flat on the top beam 31.

[0057] Step 4: The top beam 31 is raised by the hydraulic column 32, so that the top beam 31 clamps and holds the hanging cloth strip 5 with the support force of the roof of the goaf 11. The hanging cloth strip 6 with holes is hung by the vertical hanging columns 413 at both ends. The flexible bag 2 is supported on three sides. The folding template 4 is adjusted to form a cuboid filling space. The two ends of the nylon strap 8 are fixed to the folding template 4. The nylon strap 8 plays the role of controlling the length of the cuboid space inside the folding template 4 and the bulging deformation of the side of the flexible bag 2.

[0058] Step 5: Repeat steps 1 to 4 to complete the installation of 2 to 6 rigid-flexible unit formwork support devices. All rigid-flexible unit formwork support devices should be located in the same straight line, and the distance between adjacent rigid-flexible unit formwork support devices should not be less than 0.2m.

[0059] Step 6: Filling material is injected into the flexible bag 2 through the injection port 7 via the delivery pipe until the top is full, forming a discontinuous wall along the alley.

[0060] Step 7: When the filling material has solidified to the set strength, untie or cut the nylon strip 8, lower the top beam 31 through the hydraulic column 32, and use the support transport vehicle 9 to move and pull out the unit formwork 1. Fold and retract the two wings of the folding template 4. Specifically, fold the upper two wing templates 412 away from the goaf 13 and fold the lower two wing templates 422 towards the goaf, and push back the side support roof of the roadway wall. When the unit formwork 1 is needed, it can be moved by the support transport vehicle 9.

[0061] Step 8: Use shotcrete to spray concrete between the discontinuous walls along the alley to fill the gaps between adjacent walls.

[0062] Example 3

[0063] In a certain mine, the coal seam thickness is 2.5m and the roof is moderately stable. The conveyor belt roadway 10 of the fully mechanized longwall face is 2.3m high and 5.8m wide. Roadway 10 will be used as the return air roadway of the next adjacent working face to form roadway 11. Before the construction of roadway 11, a two-face, three-roadway combined layout will be formed. Construction materials and equipment for roadway 11 can be transported from roadway 10 of the adjacent working face. At the same time, a U+L ventilation mode will be formed, with the adjacent working face receiving air, the conveyor belt roadway of this working face receiving air, and the return air roadway providing return air.

[0064] The wall thickness of the tunnel 11 is 1.0m, and the height is the same as that of the tunnel. The width of the tunnel after the tunnel 11 is 4.5m. The length of the unit formwork 1 is 2.9m. The width of the folding template 4 after it is retracted is 1.2m, and the width after it is unfolded is 2.2m. The height ranges from 1.8 to 2.6m, and the weight is 6 tons. The dimensions of the flexible bag 2 are: length × width × height = 3.0m × 1.1m × 2.6m.

[0065] The specific layout of the goaf roadway is as follows: A rock-blocking device 14 is installed behind the end support 12 to protect the rock from the goaf 13. During normal production, for each cut, i.e. 0.8m, a wooden stake 15 is driven behind the end support 12 against the rock-blocking device 14. When the wall space to be poured is more than 3m away, the unit formwork 1 that has been pulled out is moved forward by the support transport vehicle 9 behind it and then placed in the wall space to be poured behind the end support 12.

[0066] According to the design requirements for location and spacing, until 2 to 6 unit mold frames 1 are transported and installed, all unit mold frames 1 are located on a straight line during installation, and the net distance between adjacent unit mold frames 1 is greater than 0.2m. Thus, a support and pouring space with a length of about 6-18m is formed.

[0067] Then, the upper and lower wing templates of unit formwork 1 are opened, and the upper wing templates 41 are raised using unit hydraulic supports 3 to suspend the flexible bag 2. Finally, the delivery pipe is inserted into the injection port 7 and tied, and the filling material required for the wall is injected to form the wall. After the wall has solidified for a certain time and gained strength, unit formwork 1 is lowered, and the unit formwork 1 is pulled out 1m away from the wall using the support transport vehicle 9. The upper wing templates 412 are then retrieved into the goaf roadway 11, and the lower wing templates 422 are retrieved towards the goaf area 13. Then, the unit formwork 1 is moved to a position close to the wall and raised to support the roof. The gaps in the walls of adjacent roadways are sealed by shotcrete.

Claims

1. A rigid-flexible unit template support device for roadway retention along the goaf, characterized in that, The device includes a unit mold frame (1) and a flexible bag (2). The unit mold frame (1) includes a folding template (4) that is connected to each other. The folding template (4) is composed of an upper two-wing template (41) and a lower two-wing template (42) that are vertically arranged. The upper two-wing template (41) is wrapped around the outside of the lower two-wing template (42) or the upper two-wing template (41) is wrapped around the inside of the lower two-wing template (42). A unit hydraulic support (3) is provided on one side of the folding template (4). The long side of the unit hydraulic support (3) is connected to the folding template (4). The unit hydraulic support (3) controls the upper two-wing template (41) to slide up and down relative to the lower two-wing template (42). The unit hydraulic support (3) includes a base (33) that is in the shape of an inverted T. The top of the base (33) is vertically fixedly connected to two hydraulic columns (32) on the left and right. The two hydraulic columns (32) are fixedly connected to a top beam (31) at the end away from the base (33). The upper two-wing template (41) includes an upper main template (411), which is connected to the long side of the top beam (31). The upper two-wing template (412) is movably connected to both sides of the upper main template (411). The upper two-wing template (412) rotates along the adjacent side of the upper main template (411) along a vertical axis. The lower two-wing template (42) includes a lower main template (421), which is connected to the long side of the base (33). The lower two-wing template (422) is movably connected to both sides of the lower main template (421), and the lower two-wing template (422) rotates along the adjacent side of the lower main template (421) on a vertical axis. The top of the upper two-wing template (41) is also connected to a flexible bag (2) for preventing grout leakage. The flexible bag (2) is rectangular in shape and is made of woven microporous fiber cloth. The flexible bag (2) is provided with perforated hanging strips (6) on the short sides of the two sides adjacent to the upper two-wing template (412). The perforated hanging strips (6) have 3 to 10 through holes at equal intervals. The long side of the flexible bag (2) adjacent to the upper main template (411) is provided with clamping hanging strips (5). The top of the upper two-wing template (412) is vertically fixed with vertical hanging posts (413) corresponding to the through holes on the perforated hanging strips (6) to penetrate the holes of the perforated hanging strips (6) and hang the flexible bag (2).

2. The rigid-flexible unit template support device for roadway retention according to claim 1, characterized in that, The upper main template (411) and the lower main template (421) are rectangular in shape. The upper main template (411) has notches on both sides of the top. The flexible bag (2) has an injection port (7) at the position of the notch.

3. The rigid-flexible unit template support device for roadway retention according to claim 2, characterized in that, A telescopic guide column is also vertically arranged between the top beam (31) and the base (33).

4. The rigid-flexible unit template support device for roadway retention according to claim 1, characterized in that, The lengths of the top beam (31) and the base (33) are less than the lengths of the upper main template (411) and the lower main template (421), respectively.

5. The rigid-flexible unit template support device for roadway retention according to claim 4, characterized in that, The flexible bag (2) is provided with several nylon strips (8) on the side away from the unit hydraulic support (3). The nylon strips (8) are evenly spaced horizontally from top to bottom. The two ends of the nylon strips (8) are connected to the folding template (4) to control the length of the internal space enclosed by the folding template (4) and reduce the amount of bulging of the flexible bag (2) on the side near the goaf (13).

6. A construction method for a rigid-flexible unit formwork support device for gob-side roadway retention, employing the rigid-flexible unit formwork support device for gob-side roadway retention as described in claim 5, characterized in that, Includes the following steps: Step 1: After the coal is cut and mined by the coal mining machine, the end support (12) at the roadway is moved, and the rock-blocking device (14) behind the end support (12) is moved forward and rock-blocking support is provided. The above operation is repeated to form a 3m to 6m long cast-in-place wall space on the goaf side behind the end support (12). Step 2: Move the unit formwork (1) behind the goaf roadway (11) forward to the position of the wall to be poured on the side of the rock blockage device (14) using the support transport vehicle (9). Open the upper two wing formwork (412) and the lower two wing formwork (422) to point towards the goaf area (13). Then adjust the unit formwork (1) to the position of the wall to be poured using the support transport vehicle (9). Step 3: Hang the flexible bag (2) through the unit mold frame (1), insert the through holes of the perforated hanging strips (6) at both ends of the flexible bag (2) into the vertical hanging column (413), and then lay the clamping hanging strips (5) on the side of the flexible bag (2) flat on the top beam (31). Step 4: The top beam (31) is raised by the hydraulic column (32), so that the top beam (31) clamps the hanging cloth strip (5) with the support force of the roof of the goaf roadway (11). The hanging cloth strip (6) with holes is hung by the vertical hanging columns (413) at both ends. The folding template (4) is adjusted to form a rectangular filling space, and the two ends of the nylon strip (8) are fixed on the folding template (4). Step 5: Repeat steps 1 to 4 to complete the installation of 2 to 6 rigid-flexible unit formwork support devices, with all rigid-flexible unit formwork support devices located in a straight line. Step 6: The filling material is injected into the flexible bag (2) through the injection port (7) via the delivery pipe until the top is full, forming a discontinuous wall along the alley; Step 7: When the filling material has solidified to the set strength, untie the nylon tape (8), lower the top beam (31) through the hydraulic column (32), use the support transport vehicle (9) to move the unit formwork (1) out laterally, fold and retract the two wings of the folding template (4), and push back the side support plate of the alleyway wall. When the unit formwork (1) is needed, it can be moved by the support transport vehicle (9). Step 8: Use shotcrete to spray concrete between the discontinuous walls along the alley to fill the gaps between adjacent walls.

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