Isolating and plugging method for rear segment position of paste filling frame

Abstract

The invention provides a method for isolating and plugging a section position behind a paste filling frame, the section position behind the frame is mainly used for dividing a filling space behind the frame into a plurality of sections, and the specific position where the divided sections are in contact is the specific section isolation position; the isolation plugs at the segmented positions are mainly composed of segmented isolation supports, single hydraulic props, wooden baffles and plugging cloth. And a segmented isolation support is installed at the segmented isolation position, an artificial wood baffle is built in the segmented isolation support and close to the filling body side, the artificial wood baffle is supported by a single hydraulic supporting column, and plugging cloth is hung on the artificial wood baffle. According to the method, a multi-section filling space is provided for paste filling, multi-section simultaneous operation can be achieved for subsequent filling, the problems of filling body leakage, long filling body solidification time, long filling construction operation time and the like of a traditional filling process can be greatly solved, and the problems that traditional segmented position isolation plugging is poor in sealing performance, low in strength, indefinite in specific construction and the like are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine backfill mining, and specifically to a method for isolating and sealing the segmented positions behind the paste filling support, which is particularly applicable to the refined isolation and sealing control of the space behind the support in the multi-segment backfill operation of the space behind the support. Background Art

[0002] In recent years, the backfill coal mining technology has gradually matured and has been widely applied in the "three-under" coal mining in China, achieving remarkable economic, social and environmental benefits. The backfill effect of the space behind the support directly affects the surrounding rock control effect, and its technical bottleneck has always restricted the improvement of the quality and efficiency of the backfill process. The existing technologies mostly adopt the method of directly backfilling the overall space. Although it can meet the basic requirements, there are problems such as leakage of the paste filling body, resulting in waste of materials and roadway pollution, excessive single backfill volume, leading to an extended solidification period, and low backfill operation efficiency. When using the segmented backfill construction operation, there is no specific construction method for the segmented isolation position, and there are also problems such as poor sealing and low strength of the segmented position isolation and sealing. Summary of the Invention

[0003] Aiming at the above-mentioned technical deficiencies, the purpose of the present invention is to provide a method for isolating and sealing the segmented positions behind the paste filling support, so as to solve the problems of leakage of the paste filling body, long solidification time of the filling body, and low backfill operation efficiency in the traditional backfill process.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A method for isolating and sealing the segmented positions behind the paste filling support includes the following steps:

[0006] Step 1: According to the length of the backfill area behind the support and the comprehensive geological conditions, divide the paste filling area behind the support into multiple sections, and the intersections of each section are used as the specific positions for segmented isolation;

[0007] Step 2: In the area behind the paste filling support of the working face, fix the lower isolation baffle, and the operation console vertically raises the upper isolation baffle behind the support to a preset height and locks it. After the roof passes the stability detection, the operator carries the equipment and enters the working space behind the support through the safety passage for construction operations, and simultaneously turns on protective devices such as ventilation and dust removal to ensure the safety of the operation environment;

[0008] Step 3: Install segmented isolation supports at the segmented isolation and sealing positions, build wooden baffles inside the segmented isolation supports close to the filling body side, stack the wooden boards horizontally and staggeredly, fix the wooden boards to each other, and embed rubber sealing strips between adjacent baffles. The stacking height of the baffles is the height of the backfill space;

[0009] Step 4: Cover multiple layers of sealing cloth on the side surface of the wooden baffle, and install multiple single hydraulic props outside the sealing cloth to fix the sealing cloth and support the wooden baffle.

[0010] Preferably, the length of the specific position of the segmented isolation is the width of the backfilling space behind the support, the height is the height of the backfilling space behind the support, the width is determined by the segmented isolation support, and the width does not exceed the maximum telescopic range of the segmented isolation support.

[0011] Preferably, the specific segmented position is different in each filling cycle, and can be dynamically adjusted along the inclination of the filling working face. The dynamic adjustment position is at least one width of the specific segmented position. The specific segmented position in the previous filling cycle is filled together with the filling area in the next cycle.

[0012] Preferably, after the upper isolation baffle is locked, the bearing surface pressure value needs to reach the allowable value or above before allowing personnel to enter the operation space.

[0013] Preferably, the segmented isolation support includes multiple groups of metal retaining walls and columns.

[0014] Preferably, all segmented isolation positions in the backfilling area behind the support can be constructed and operated simultaneously.

[0015] Preferably, the sealing cloth is made of waterproof material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] By designing a specific segmented position sealing and isolation method, this method solves the problems of poor sealing, low strength, and unclear specific construction in the traditional segmented position isolation and sealing. At the same time, by dividing the specific segmented positions, the paste filling space behind the support is segmented and isolated, providing multiple segmented filling spaces for subsequent paste filling, for subsequent multi-segment simultaneous filling operations, which can greatly solve the problems of paste leakage in the traditional filling process, long solidification time of the filling body, and long filling construction operation time. Description of the Drawings

[0018] Figure 1 is a schematic diagram of a paste filling method for isolating and sealing segmented positions behind a support of the present invention;

[0019] Figure 2 is a schematic diagram of the segmented positions in the filling area.

[0020] Among them:

[0021] 1. Lower isolation baffle; 2. Segmented isolation support; 3. Upper isolation baffle; 4. Column; 5. Specific segmented position; 6. Single hydraulic prop; 7. Sealing cloth; 8. Wood board; 9. Roof; 10. Filling body; 11. Paste filling support; 12. Filling area. Detailed Embodiment

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] As Figure 1 、 Figure 2 shown, a method for isolating and plugging the position after the paste filling support section includes:

[0024] According to the length of the filling area 12 behind the support and the comprehensive geological conditions, the paste filling area 12 behind the support is divided into multiple sections, and the specific positions where each section intersects are the section positions;

[0025] In the rear area of the paste filling support 11 at the working face, the lower isolation baffle 1 is fixed, and the operation console vertically raises the upper isolation baffle 3 behind the support to a preset height and locks it. After the roof 9 passes the stability detection, the operators carry equipment and enter the working space behind the support through the safety passage for construction operations, and simultaneously turn on protective devices such as ventilation and dust removal to ensure the safety of the working environment;

[0026] Install a sectional isolation support 2 at the specific sectional isolation position 5, build a wooden baffle inside the sectional isolation support 2 close to the filling body 10 side, stack the wooden boards 8 horizontally in a staggered manner, fix the wooden boards 8 to each other, and embed rubber sealing strips between adjacent baffles. The stacking height of the baffles is the height of the filling space.

[0027] Cover multiple layers of plugging cloth 7 on the side surface of the wooden board 8, and install a plurality of single hydraulic props 6 outside the plugging cloth 7 to fix the plugging cloth 7 and support the wooden board 8.

[0028] Example 1 (sectional plugging of a conventional working face)

[0029] In a certain mining area, the mining height of the filling working face is 4.5 m, and the length of the filling space behind the support is 120 m. The implementation process is as follows:

[0030] Sectional planning:

[0031] Divide the filling area into 3 independent sections, each 40 m long;

[0032] Select the sectional isolation positions at two roof-integral areas of 40 m and 80 m;

[0033] Isolation section size: width (along the strike) 1.2 m, height 4.3 m, length (dip) 6 m (support width); [[ID=4*]]

[0034] Isolation structure construction:

[0035] Install a ZFL6000 type sectional isolation support (including 4 Φ180 mm columns);

[0036] Use pine boards (50 mm thick) to stack the retaining wall in a staggered manner, and add a 10-mm-thick chloroprene rubber strip between layers;

[0037] Lay three layers of waterproof and sealing cloth on the outside of the retaining wall (the middle layer is a PVC-coated cloth, and the inner and outer layers are fiber-reinforced cloth);

[0038] Support system:

[0039] Arrange DW35-250 / 110X type single hydraulic props at a spacing of 0.8 m in a plum blossom pattern;

[0040] The pre-tightening force reaches 90 kN / m 2 Then carry out the filling operation;

[0041] Set pressure sensors to monitor the pressure-bearing state of the retaining wall in real time;

[0042] Effect verification:

[0043] No leakage occurred when the paste filling pressure was 1.2 MPa;

[0044] Adjacent sections can be filled synchronously, and the overall efficiency is increased by 60%;

[0045] The initial setting time of a single-section filling body is shortened to 8 hours (the original overall filling took 24 hours);

[0046] Example 2 (Enhanced plugging under complex conditions)

[0047] There is water inrush in a certain kilometer-deep well working face, and the height of the space behind the support is 5.2 m. Implement a special plan:

[0048] Enhanced sectional design:

[0049] Adopt a combination of "large section + small section" division (the main isolation spacing is 60 m, and the auxiliary isolation spacing is 20 m);

[0050] Add a movable isolation unit in the fault zone (which can withstand a deformation of 3 mm / m);

[0051] Composite plugging structure:

[0052] The retaining wall adopts a composite structure of anti-corrosion cypress wood board + 20 mm steel plate (inject polyurethane sealant in the middle);

[0053] The plugging cloth adopts a four-layer structure:

[0054] Inner layer: butyl rubber waterproof coiled material;

[0055] Middle layer: Kevlar fiber reinforcement layer;

[0056] Outer layer: polytetrafluoroethylene wear-resistant layer;

[0057] Set annular grouting pipes (at intervals of 2 m) for emergency plugging;

[0058] Special support system:

[0059] Double-row hydraulic props are adopted (the front row is for outburst prevention and the rear row is for bearing pressure);

[0060] Self-moving reinforcement supports are equipped (automatically supplement support when the pressure exceeds 15 MPa); An ultrasonic flaw detector is installed to monitor the integrity of the wooden board structure;

[0061] Implementation effect:

[0062] Keep the sealing performance under the water inflow condition of 0.8 m 3 / min;

[0063] Withstand a maximum filling pressure of 2.8 MPa;

[0064] The daily advance of the working face is increased from 2.4 m to 4 m.

Claims

1. A method for isolating and plugging the segmented positions behind the paste filling rack, characterized in that It includes the following steps: Step 1: According to the length of the post-supports filling area (12) and the comprehensive geological conditions, divide the post-supports paste filling area (12) into multiple sections, and the intersection of each section is used as the specific position of the sectional isolation (5); Step 2: In the rear area of the paste filling support (11) in the working face, fix the lower isolation baffle (1), the operation console vertically raises the upper isolation baffle (3) behind the support to the preset height and locks it. After the roof (9) passes the stability detection, the operators carry equipment and enter the working space behind the support through the safety passage for construction operations, and simultaneously turn on protective devices such as ventilation and dust removal to ensure the safety of the working environment; Step 3: Install sectional isolation supports (2) at the sectional isolation and plugging positions, build wooden baffles on the side of the sectional isolation supports (2) close to the filling body (10), stack the wooden boards (8) horizontally and staggeredly, fix the wooden boards (8) to each other, and embed rubber sealing strips between adjacent baffles. The stacking height of the baffles is the height of the filling space; Step 4: Cover multiple layers of plugging cloth (7) on the side surface of the wooden baffle, and install multiple single hydraulic props (6) outside the plugging cloth (7) to fix the plugging cloth (7) and support the wooden baffle.

2. A method for isolating and sealing the segmented position at the rear of a paste filling rack as claimed in claim 1, characterized in that The length of the specific position of the sectional isolation (5) is the width of the post-supports filling space, the height is the height of the post-supports filling space, and the width is determined by the sectional isolation support (2), and the width does not exceed the maximum telescopic range of the sectional isolation support (2).

3. A method for isolating and sealing the position of the latter segment of a paste filling rack according to claim 1, characterized in that, The specific sectional positions are different in each filling cycle and can be dynamically adjusted along the dip of the filling working face. The dynamic adjustment position is at least one width of the specific sectional position. The specific sectional position in the previous filling cycle is filled together with the filling area in the next cycle.

4. A method for isolating and plugging the post-segment position of a paste filling rack according to claim 1, characterized in that After the upper isolation baffle (3) is locked, the bearing surface pressure value needs to reach the allowable value or above before allowing personnel to enter the working space.

5. A method for isolating and sealing the post-segment position of a paste filling rack according to claim 1, characterized in that, The sectional isolation support (2) includes multiple groups of metal retaining walls and columns (4).

6. A method for isolating and sealing the segmented position at the rear of a paste filling rack according to claim 1, characterized in that, All sectional isolation positions in the post-supports filling area (12) can be constructed simultaneously.

7. A method for isolating and plugging the segmented position at the rear of a paste filling rack according to any one of claims 1 to 6, characterized in that The plugging cloth (7) is made of waterproof material.

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