Adjustable closed retaining wall for preventing leakage in underground mine filling stope

Abstract

This invention discloses an adjustable, leak-proof retaining wall for underground mine backfilling areas, comprising: a prefabricated retaining wall main structure, fixed to an opening in the surrounding rock by multiple anchor bolts; a support layer, tightly abutting one end of the prefabricated retaining wall main structure; a permeable layer, tightly abutting one end of the support layer away from the prefabricated retaining wall main structure; a metal clamping plate, tightly abutting one end of the permeable layer away from the support layer, and fixed to the surrounding rock by multiple expansion bolts to keep the permeable layer in a tight-fitting state; and a cement layer plastered on the inner wall of the metal clamping plate. By using metal clamping plates to tighten the permeable layer as a whole, instead of manually tightening the permeable layer in localized areas, the permeable layer does not need to be tied in sections, reducing the amount of manual labor. Furthermore, the metal clamping plate is fully tightened to the inner wall of the surrounding rock by multiple equally spaced expansion bolts, resulting in strong sealing consistency and overcoming the defects of unstable quality in manual construction.

Description

Technical Field

[0001] This invention relates to the field of mine backfilling and sealing equipment technology, specifically to an adjustable sealing retaining wall for preventing seepage in underground mine backfilling areas. Background Technology

[0002] Backfill mining relies on transporting backfill slurry to the goaf to form a backfill body to support the surrounding rock. Prefabricated adjustable steel frame retaining walls have become the mainstream equipment for underground backfilling and sealing due to their adjustable span, reusable components, and high installation efficiency. The standard structure includes an adjustable arc-shaped steel frame, a steel mesh support layer, and a permeable filter layer. The permeable layer needs to be extended and overlapped with the surrounding rock to achieve water filtration and seepage prevention. The sealing structure directly determines whether backfilling operations will experience slurry leakage or seepage. The existing adjustable retaining wall sealing system relies solely on a single layer of cement grout and loose slag to seal the overlapping edge of the permeable surrounding rock, which has the following drawbacks: 1. The construction process is complicated and the sealing quality is uncontrollable by human: the outer edge of the permeable layer needs to be tightened manually, tied in sections, filled in the gaps of the rock wall, and the wrinkles need to be repaired, which requires a large amount of manual work; the cement cannot be completely adhered to the uneven parts of the rock wall due to over-excavation or under-excavation, resulting in poor sealing consistency.

[0003] 2. Weak resistance to damage in sealing layer: Downhole blasting vibrations can easily cause the cement sealing layer to crack and fall off; under high slurry lateral pressure, the cement layer produces micro-cracks, and leakage problems are prominent in large-section mining areas.

[0004] 3. Steel frame is prone to corrosion and has a short service life: Without an isolation and buffer structure, the filling slurry directly washes over and contacts the steel structure, causing the slurry to solidify and adhere, corroding the steel beams, and causing them to deform under long-term pressure, which greatly reduces the number of times the components can be recycled.

[0005] 4. Difficult to recycle after filling and solidification: After the filling material solidifies, the retaining wall continues to bear lateral pressure. The permeable layer is tightly bonded to the rock wall and cement sealing layer, leaving no gap for disassembly and assembly operations, making it impossible to disassemble the skeleton and filter cloth without damage.

[0006] To address the aforementioned shortcomings, this invention adds a segmented metal pressure plate double sealing structure to the existing adjustable arc-shaped steel beam frame, which is compatible with existing construction practices and takes into account seepage prevention, simple construction, and low-cost reuse.

[0007] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0008] The purpose of this invention is to provide an adjustable closed retaining wall for seepage prevention in underground mine filling areas, so as to solve the problems mentioned in the background art, such as poor construction consistency, weak resistance to damage, easy corrosion of steel frame and difficulty in recycling of existing sealing systems.

[0009] To achieve the above objectives, the present invention provides the following technical solution: An adjustable sealing retaining wall for seepage prevention in underground mine backfilling areas includes: The main structure of the prefabricated retaining wall is fixed to the opening in the surrounding rock by multiple anchor bolts; A support layer is abutted against one end of the prefabricated retaining wall main structure; A permeable layer is fitted tightly against the support layer at one end away from the main structure of the prefabricated retaining wall. A metal pressure plate is pressed against the end of the permeable layer away from the support layer and fixed to the surrounding rock by multiple expansion bolts to keep the permeable layer in a pressed state. A cement layer is applied to the inner wall of the metal sheet to seal the gap between the metal sheet and the permeable layer.

[0010] Furthermore, the metal sheet is an annular plate structure adapted to the shape of the opening in the surrounding rock; One end of the metal sheet abuts against the surface of the permeable layer; The outer edge of the metal sheet abuts against the inner wall of the surrounding rock.

[0011] Furthermore, the expansion bolts are arranged at equal intervals along the circumference of the metal pressure plate; The expansion bolt passes through the inside of the metal pressure plate to the outside and is driven into the surrounding rock.

[0012] Furthermore, the cement layer covers the surface of the metal sheet facing the permeable layer, and the cement layer extends to fill the overlap gap between the metal sheet and the permeable layer.

[0013] Furthermore, the cement layer is solidified and bonded to the inner wall of the metal sheet to form an anti-corrosion protective layer for the metal sheet while sealing the gap.

[0014] Furthermore, the supporting layer is a steel mesh supporting layer, and the permeable layer is a water-filtering and permeable cloth layer. The supporting layer and the permeable layer are sequentially attached to the same side of the prefabricated retaining wall main structure.

[0015] Furthermore, the main structure of the prefabricated retaining wall is an adjustable arc-shaped steel beam frame; The anchor bolts are distributed around the main structure of the prefabricated retaining wall and are used to erect and fix the main structure of the prefabricated retaining wall into the opening in the surrounding rock.

[0016] Furthermore, the expansion bolts are driven in a direction perpendicular to the inner wall surface of the surrounding rock, and multiple expansion bolts lock the metal pressure plate to the surrounding rock in a multi-point fixing manner.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention replaces manual tightening of the permeable layer by using metal pressure plates to tighten the entire permeable layer. This eliminates the need for segmented binding of the permeable layer, reducing the amount of manual labor. Furthermore, the metal pressure plates are fully pressed against the inner wall of the surrounding rock by multiple expansion bolts arranged at equal intervals, resulting in strong sealing consistency and overcoming the defects of unstable quality in manual construction.

[0018] 2. By setting a metal pressure plate as an intermediate isolation layer, the present invention effectively buffers the direct scouring and contact of the filling slurry with the steel frame, avoids the slurry consolidation and adhesion and corrosion of the steel beam, and greatly improves the number of times the components can be recycled and the overall service life.

[0019] 3. This invention applies cement powder to the inner wall of the metal plate, allowing the cement to directly bond with the metal plate. This not only further seals the gap between the permeable layer and the rock wall, achieving multiple seepage prevention effects, but also uses the cement layer to protect the metal plate from corrosion, extending the equipment maintenance cycle.

[0020] 4. The present invention uses a mechanical fixing structure of metal pressure plate and expansion bolts. After the filling material solidifies, the expansion bolts can be removed and the metal pressure plate can be taken off. This provides operating space for disassembling the frame and filter cloth, reduces the difficulty of recycling, and realizes non-destructive disassembly and efficient reuse of components. Attached Figure Description

[0021] Figure 1 This is an exploded view of the closed retaining wall of the present invention; Figure 2 This is a diagram showing the fit between the metal pellets of this invention and the surrounding rock; Figure 3 For the present invention in Figure 2 Enlarged view of point A in the middle; Figure 4 This diagram shows the fit between the prefabricated retaining wall main structure and the metal pressure plate of the present invention. Figure 5 For the present invention in Figure 4 Enlarged view of point B in the middle.

[0022] Reference numerals: 100, surrounding rock; 1, main structure of prefabricated retaining wall; 11, anchor bolt; 2, supporting layer; 3, permeable layer; 4, metal pressure plate; 41, expansion bolt; 42, cement layer. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-5 The present invention provides a technical solution: An adjustable sealing retaining wall for seepage prevention in underground mine backfilling areas includes: The prefabricated retaining wall main structure 1 is fixed to the opening of the surrounding rock 100 by multiple anchor rods 11; Support layer 2 is abutted against one end of the prefabricated retaining wall main structure 1; The permeable layer 3 is abutted against the end of the support layer 2 that is away from the main structure 1 of the prefabricated retaining wall; A metal pressure plate 4 is pressed against one end of the permeable layer 3 away from the support layer 2 and fixed to the surrounding rock 100 by multiple expansion bolts 41 so that the permeable layer 3 remains pressed against the support layer 2. Cement layer 42 is applied to the inner wall of the metal sheet 4 to seal the gap between the metal sheet 4 and the permeable layer 3.

[0025] As an improvement, such as Figure 1-5 As shown, the metal pressure plate 4 is an annular plate structure adapted to the opening shape of the surrounding rock 100; One end of the metal sheet 4 abuts against the surface of the permeable layer 3; The outer edge of the metal plate 4 abuts against the inner wall of the surrounding rock 100.

[0026] Furthermore, such as Figure 3-5 As shown, multiple expansion bolts 41 are arranged at equal intervals along the circumference of the metal pressure plate 4; The expansion bolt 41 passes through the inside of the metal pressure plate 4 to the outside and is driven into the surrounding rock 100.

[0027] Furthermore, the cement layer 42 covers the surface of the metal sheet 4 facing the permeable layer 3, and the cement layer 42 extends to fill the overlap gap between the metal sheet 4 and the permeable layer 3.

[0028] Among them, such as Figure 2 , Figure 4 As shown, the cement layer 42 is solidified and bonded to the inner wall of the metal plate 4, so as to form an anti-corrosion protective layer for the metal plate 4 while sealing the gap.

[0029] As an improvement, such as Figure 1 , Figure 4 As shown, the support layer 2 is a steel mesh support layer, and the permeable layer 3 is a water-filtering and permeable cloth layer. The support layer 2 and the permeable layer 3 are sequentially attached to the same side of the prefabricated retaining wall main structure 1.

[0030] Furthermore, such as Figure 2 As shown, the main structure 1 of the prefabricated retaining wall is an adjustable arc-shaped steel beam frame; The anchor bolts 11 are distributed around the prefabricated retaining wall main structure 1 and are used to erect and fix the prefabricated retaining wall main structure 1 into the opening of the surrounding rock 100.

[0031] Furthermore, the expansion bolts 41 are driven in a direction perpendicular to the inner wall surface of the surrounding rock 100, and the multiple expansion bolts 41 lock the metal pressure plate 4 to the surrounding rock 100 in a multi-point fixing manner.

[0032] It should be noted that, in the specific implementation of this invention, such as Figure 1-4 As shown, the prefabricated retaining wall main structure 1 is inserted into the openings of the surrounding rock 100 that need to be sealed by anchor rods 11 around its perimeter, so that the prefabricated retaining wall main structure 1 is in an upright state. The support layer 2 and the permeable layer 3 are then pressed against one end of the prefabricated retaining wall main structure 1 in sequence. Finally, the metal pressure plate 4 is pressed against one end of the permeable layer 3 relative to the support layer 2. Expansion bolts 41 are driven into the interior of the surrounding rock 100 from the inside of the metal pressure plate 4. This ensures that the metal pressure plate 4 keeps the permeable layer 3 pressed against the wall of the surrounding rock 100 while keeping it pressed against the wall. In the entire construction process, the metal pressure plate 4 is used to press the permeable layer 3 as a whole instead of manually tightening the local extension of the permeable layer 3. There is no need to tie the permeable layer 3 in sections, which reduces the amount of manual labor. Moreover, the use of multiple equally spaced expansion bolts 41 to press the metal pressure plate 4 against the wall of the surrounding rock 100 ensures a strong and consistent seal. like Figure 2-5 As shown, cement is then applied to the inner wall of the metal plate 4 in sequence, which further seals the gap between the metal plate 4 and the permeable layer 3, achieving a tight fit between the permeable layer 3, the rock wall, and the cement sealing layer. The cement is directly bonded to the metal plate 4, which can provide corrosion protection for the metal plate 4 and improve the service life of the entire closed retaining wall. like Figure 5 As shown, in addition, by adopting a mechanical fixing structure between the metal plate 4 and the expansion bolt 41, the expansion bolt 41 can be removed and the metal plate 4 can be taken off after the filling material solidifies, which provides operating space for disassembling the frame and filter cloth, reduces the difficulty of recycling, and realizes the non-destructive disassembly and efficient reuse of components.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable, leak-proof retaining wall for underground mine backfilling areas, characterized in that, include: The prefabricated retaining wall main structure (1) is fixed to the opening of the surrounding rock (100) by multiple anchor rods (11); The support layer (2) is abutted against one end of the prefabricated retaining wall main structure (1); A permeable layer (3) is abutted against one end of the support layer (2) away from the main structure (1) of the prefabricated retaining wall; Metal pressure plate (4) is pressed against one end of the permeable layer (3) away from the support layer (2) and fixed to the surrounding rock (100) by multiple expansion bolts (41) so that the permeable layer (3) remains pressed against the support layer (2). A cement layer (42) is applied to the inner wall of the metal sheet (4) to seal the gap between the metal sheet (4) and the permeable layer (3).

2. The adjustable sealed retaining wall for seepage prevention in underground mine backfilling areas according to claim 1, characterized in that: The metal plate (4) is an annular plate structure adapted to the opening shape of the surrounding rock (100); One end of the metal sheet (4) abuts against the surface of the permeable layer (3); The outer edge of the metal plate (4) abuts against the inner wall of the surrounding rock (100).

3. The adjustable sealed retaining wall for seepage prevention in underground mine backfilling areas according to claim 2, characterized in that: Multiple expansion bolts (41) are arranged at equal intervals along the circumference of the metal pressure plate (4); The expansion bolt (41) passes through the inside of the metal pressure plate (4) to the outside and is driven into the surrounding rock (100).

4. The adjustable sealed retaining wall for seepage prevention in underground mine backfilling areas according to claim 1, characterized in that: The cement layer (42) covers the side surface of the metal sheet (4) facing the permeable layer (3), and the cement layer (42) extends to fill the overlap gap between the metal sheet (4) and the permeable layer (3).

5. The adjustable sealed retaining wall for seepage prevention in underground mine backfilling areas according to claim 1, characterized in that: The cement layer (42) is solidified and bonded to the inner wall of the metal plate (4) to form an anti-corrosion protective layer for the metal plate (4) while sealing the gap.

6. The adjustable sealed retaining wall for seepage prevention in underground mine backfilling areas according to claim 1, characterized in that: The support layer (2) is a steel mesh support layer, and the permeable layer (3) is a water-filtering and permeable cloth layer. The support layer (2) and the permeable layer (3) are sequentially attached to the same side of the prefabricated retaining wall main structure (1).

7. The adjustable closed retaining wall for seepage prevention in underground mine backfilling areas according to claim 1, characterized in that: The main structure (1) of the prefabricated retaining wall is an adjustable arc-shaped steel beam frame; The anchor bolts (11) are distributed around the prefabricated retaining wall main structure (1) and are used to erect and fix the prefabricated retaining wall main structure (1) in the opening of the surrounding rock (100).

8. The adjustable sealed retaining wall for seepage prevention in underground mine backfilling areas according to claim 1, characterized in that: The expansion bolts (41) are driven in a direction perpendicular to the inner wall surface of the surrounding rock (100), and the expansion bolts (41) lock the metal pressure plate (4) to the surrounding rock (100) in a multi-point fixing manner.

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