A closed retaining wall for backfilling

Abstract

This utility model belongs to the field of coal mine underground backfilling technology, specifically a closed retaining wall for backfilling mining. It includes: a backfill body, with a backfill baffle installed on the outside of the backfill body; the backfill baffle includes: modular backplate units, the front of which has a grid-like support structure composed of transverse and longitudinal reinforcing ribs; a quick-connect mechanism, located on the side of adjacent modular backplate units, including plug-in buckles and bolt reinforcement holes, the plug-in buckles being used to connect adjacent modular backplate units, and the bolt reinforcement holes being evenly distributed along the edge of the modular backplate units; and a hydraulic single-unit column, located on the outside of the backfill baffle, providing support for the backfill baffle and supporting it between the top and bottom of the roadway. This utility model effectively prevents slurry leakage, reduces maintenance difficulty, and ultimately achieves comprehensive optimization of construction efficiency, structural strength, environmental adaptability, and safety.

Description

Technical Field

[0001] This utility model belongs to the field of underground coal mine backfilling technology, specifically a closed retaining wall for backfilling mining. Background Technology

[0002] In underground coal mining, backfilling is commonly used to support the goaf to ensure roof stability and control surface subsidence. Traditionally, the retaining walls on both sides of the backfill are constructed on-site using bricks or concrete to form a closed structure, thus restricting the flow and shaping of the backfill material (such as paste, gangue mixture, etc.). However, with increasing demands for efficient coal mining and green construction, traditional brick retaining walls are gradually revealing the following technical bottlenecks:

[0003] 1. Poor construction efficiency and adaptability to downhole operations.

[0004] Coal mines are characterized by long, narrow spaces and complex environments. Brick retaining walls must be built manually, layer by layer, with daily construction progress typically not exceeding 10 linear meters, severely hindering the efficiency of mining operations. Furthermore, limited underground transportation necessitates frequent mine car relocation for handling large quantities of bricks, cement, and other materials, further extending the construction period. In challenging geological areas such as steeply inclined coal seams or fault zones, masonry work may even be impossible due to space constraints.

[0005] 2. The non-reusability of materials and high environmental costs.

[0006] Brick retaining walls are one-time structures; once the filling material solidifies, the retaining wall is permanently sealed underground and cannot be recycled. Industry statistics show that a single working face consumes an average of about 50,000 red bricks, generating over 200 tons of construction waste. This not only exacerbates the pressure on mine waste disposal but also increases the cost per ton of coal by approximately 1.2-1.8 yuan. Furthermore, the carbon emissions from brick production and the issue of waste rock dumping contradict the goals of green mine construction.

[0007] 3. Insufficient structural rigidity and resistance to lateral pressure.

[0008] Before the filling material solidifies, it exerts significant lateral pressure on the retaining wall, while the brick structure relies on the mortar bonding strength to resist the load, resulting in poor overall integrity. In areas of concentrated pressure, local wall cracking or even collapse often occurs, requiring work stoppage for repairs, which seriously affects the filling quality and operational safety. Summary of the Invention

[0009] To solve the above problems, this utility model provides a closed retaining wall for filling mining.

[0010] This utility model adopts the following technical solution: a closed retaining wall for backfilling mining, comprising:

[0011] The filling body is equipped with a filling baffle on its outer side.

[0012] The filling baffle includes:

[0013] A modular backplate unit, wherein the front side of the modular backplate unit is provided with a grid-like support structure composed of transverse reinforcing ribs and longitudinal reinforcing ribs;

[0014] A quick-connect mechanism is provided on the side of adjacent modular backplane units, including plug-in buckles and bolt reinforcement holes. The plug-in buckles are used to connect adjacent modular backplane units, and the bolt reinforcement holes are evenly distributed along the edge of the modular backplane unit.

[0015] A hydraulic unit column is installed outside the filling baffle to provide support for the filling baffle and to support it between the top and bottom of the tunnel.

[0016] In some embodiments, a flexible windbreak wall is also provided on the outside of the filling baffle.

[0017] In some embodiments, the flexible windbreak wall includes:

[0018] Flexible walls;

[0019] A support connector is fixed at intervals to the flexible wall. The support connector is provided with screw holes, and a screw rod is inserted into the screw hole for connecting the filling baffle.

[0020] In some embodiments, the flexible wall is made of a tear-resistant flexible material.

[0021] In some embodiments, the tear-resistant flexible material is a composite layer of high-density polyethylene film and aramid fiber cloth.

[0022] In some embodiments, the modular backplane unit includes:

[0023] Middle baffle;

[0024] A first connector and a second connector are respectively fixed on both sides of the middle baffle. The first connector has a groove for a plug-in buckle, and the second connector has a protrusion for a plug-in buckle.

[0025] In some embodiments, transverse stiffeners and longitudinal stiffeners are disposed on the intermediate baffle.

[0026] In some embodiments, the first connector further includes two insert plates, and the second connector is provided with two rectangular slots for inserting the two insert plates; the bolt reinforcement holes are provided at corresponding positions of the insert plates and the rectangular slots.

[0027] In some embodiments, the modular backplane unit further includes a drainage hole formed on the modular backplane unit, the drainage hole being connected to an external drainage pipe via a guide channel.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] Through the collaborative design of modular backplate units and quick-connect mechanisms, efficient assembly and precise positioning are achieved. The grid-like support structure composed of transverse and longitudinal reinforcing ribs significantly improves the compressive strength of the retaining wall. Combined with the active support force provided by the outer hydraulic single column, it forms a dynamic resistance to the lateral pressure of the filling body, ensuring the stability of the retaining wall under high-pressure conditions. At the same time, the modular structure supports disassembly and reuse. The adjustable height and angle of the hydraulic column allow it to adapt to different roadway cross-sectional dimensions and filling process requirements. The dual fixing mechanism of plug-in buckles and bolt reinforcement holes ensures structural sealing, effectively preventing slurry leakage and reducing maintenance difficulty. Ultimately, it achieves comprehensive optimization of construction efficiency, structural strength, environmental adaptability, and safety. Attached Figure Description

[0030] Figure 1 This is a plan view of the present invention;

[0031] Figure 2 This is a cross-sectional view of the support structure of this utility model;

[0032] Figure 3 This is a schematic diagram of a modular backplane unit structure;

[0033] Figure 4 This is a schematic diagram of a flexible wall structure;

[0034] In the figure, 1-filling body, 2-filling baffle, 3-hydraulic single column, 4-flexible windbreak wall, 21-modular back plate unit, 211-, 212-, 213-intermediate baffle, 214-bolt reinforcement hole, 215-first connector, 216-second connector, 401-support connector, 402-screw hole, 403-flexible wall. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] like Figure 1-2 As shown, a closed retaining wall for backfill mining includes:

[0037] Filling body 1, with filling baffle 2 installed on the outside of filling body 1;

[0038] like Figure 3 As shown, the filling baffle 2 includes:

[0039] Modular backplate unit 21, the front of which is provided with a grid-like support structure composed of transverse reinforcing ribs 211 and longitudinal reinforcing ribs 212;

[0040] A quick-connect mechanism is provided on the side of adjacent modular back panel units 21, including a plug-in buckle and bolt reinforcement holes 214. The plug-in buckle is used to connect adjacent modular back panel units 21, and the bolt reinforcement holes 214 are evenly distributed along the edge of the modular back panel unit 21.

[0041] The hydraulic unit column 3 is located outside the filling baffle 2, providing support for the filling baffle 2 and supporting it between the top and bottom of the tunnel.

[0042] like Figure 3 As shown, the modular backplane unit 21 includes:

[0043] Intermediate baffle 213;

[0044] The first connector 215 and the second connector 216 are respectively fixed on both sides of the intermediate baffle 213. The first connector 215 is provided with a groove for a plug-in buckle, and the second connector 216 is provided with a protrusion for a plug-in buckle.

[0045] Transverse reinforcing ribs 211 and longitudinal reinforcing ribs 212 are provided on the intermediate baffle 213. The transverse reinforcing ribs 211 and longitudinal reinforcing ribs 212 are used to increase the stability of the intermediate baffle 213.

[0046] Furthermore, the first connector 215 also includes two insert plates, and the second connector 216 is provided with two rectangular slots for inserting the two insert plates; the bolt reinforcement holes 214 are provided at corresponding positions of the insert plates and the rectangular slots.

[0047] Specifically, in use, different modular backplate units 21 are arranged side by side, and adjacent modular backplate units 21 are quickly positioned and connected to each other through the grooves and protrusions of the plug-in buckle. Then, bolts are inserted into the bolt reinforcement holes 214 and tightened to connect the different modular backplate units 21 together. Depending on the shape of the actual roadway being filled, modular backplate units 21 of different lengths are selected and connected together, which can meet the needs of rectangular roadways as well as other shapes of roadways.

[0048] The modular backplate unit 21 also includes a drainage hole formed on the modular backplate unit 1, which is connected to an external drainage pipe through a guide groove.

[0049] Specifically, a flexible windbreak wall 4 is also provided on the outside of the filling baffle 2.

[0050] like Figure 4 As shown, the flexible windbreak wall 4 includes:

[0051] Flexible wall 403;

[0052] Support connector 401 is fixed at intervals on the flexible wall 403. The support connector 401 is provided with screw holes 402, and a screw is inserted into the screw holes 402 for connecting the filling baffle 2.

[0053] Flexible wall 403 is made of tear-resistant flexible material. The tear-resistant flexible material is a composite layer of high-density polyethylene film and aramid fiber cloth.

[0054] The flexible windbreak wall 4 is combined with the filling baffle 2. The filling baffle 2 hinders the flow of the filling grout. After the filling grout begins to solidify, the outer individual columns can be recovered. By using this combination of filling baffle 2 and flexible windbreak wall 4, the filling baffle wall can be flexibly modified according to the shape and cross-sectional size of the filling tunnel, eliminating the need for brick and stone masonry, reducing labor costs, and simplifying the process. At the same time, the materials can be reused (after the filling material has solidified and reached a certain strength, it can be removed and reused in the next filling tunnel).

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A closed retaining wall for backfilling mining, characterized in that, include: A filling body (1) is provided with a filling baffle (2) on the outside of the filling body (1); The filling baffle (2) includes: Modular backplate unit (21), the front of which is provided with a grid-like support structure composed of transverse reinforcing ribs (211) and longitudinal reinforcing ribs (212); A quick-connect mechanism is provided on the side of an adjacent modular back panel unit (21), including a plug-in buckle and bolt reinforcement holes (214). The plug-in buckle is used to connect adjacent modular back panel units (21), and the bolt reinforcement holes (214) are evenly distributed along the edge of the modular back panel unit (21). Hydraulic unit column (3) is located outside the filling baffle (2) to provide support for the filling baffle (2) and to support it between the top and bottom of the tunnel.

2. The closed retaining wall for backfilling mining according to claim 1, characterized in that, A flexible windbreak wall (4) is also provided on the outside of the filling baffle (2).

3. The closed retaining wall for backfilling mining according to claim 2, characterized in that, The flexible windbreak wall (4) includes: Flexible wall (403); Support connector (401) is fixed at intervals on the flexible wall (403). The support connector (401) is provided with screw holes (402). A screw rod is inserted into the screw hole (402) for connecting the filling baffle (2).

4. The closed retaining wall for backfilling mining according to claim 3, characterized in that, The flexible wall (403) is made of tear-resistant flexible material.

5. The closed retaining wall for backfilling mining according to claim 4, characterized in that, The tear-resistant flexible material is a composite layer of high-density polyethylene film and aramid fiber cloth.

6. The closed retaining wall for backfilling mining according to claim 1, characterized in that, The modular backplane unit (21) includes: Intermediate baffle (213); The first connector (215) and the second connector (216) are respectively fixed on both sides of the middle baffle (213). The first connector (215) is provided with a groove for a plug-in buckle, and the second connector (216) is provided with a protrusion for a plug-in buckle.

7. The closed retaining wall for backfilling mining according to claim 6, characterized in that, The transverse reinforcing ribs (211) and longitudinal reinforcing ribs (212) are arranged on the intermediate baffle (213).

8. The closed retaining wall for backfilling mining according to claim 6 or 7, characterized in that, The first connector (215) also includes two insert plates, and the second connector (216) is provided with two rectangular slots for inserting the two insert plates; the bolt reinforcement holes (214) are provided at corresponding positions of the insert plates and the rectangular slots.

9. The closed retaining wall for backfilling mining according to claim 1, characterized in that, The modular backplate unit (21) also includes a drainage hole opened on the modular backplate unit (21), which is connected to an external drainage pipe through a guide groove.

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