Method for pouring roadside supporting wall through long-distance pipeline conveying

Abstract

The invention discloses a method for pouring a roadside supporting wall through long-distance pipeline conveying. The method comprises the following steps: 1, analyzing production geological conditions of a working face, and determining parameters of a roadside support wall; 2, selecting a proper position to establish a ground pumping station and an underground relay pump station; step 3; performing slurry proportioning according to the strength requirement of the roadside support wall and the transportability requirement of a pouring material; 4, laying a slurry conveying pipeline, setting pressure monitoring points in easily-blocked areas such as a side slope point and a reducing point, and establishing a pressure monitoring system; 5, comprehensive inspection is conducted on work in the step 4, problems are handled in time according to inspection results, and equipment is adjusted. According to the method, a ground pumping station and an underground leveraging pump station are arranged, pouring materials are conveyed through a slurry conveying pipeline, manual loading and unloading and mine car transportation are omitted, underground equipment is reduced, and the underground stirring process is omitted; and labor consumption caused by underground pulping and operation environment pollution caused by raised dust are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of non-coal pillar mining in coal mines, in particular to a method for pouring a tunnel side supporting wall through long-distance pipeline transportation. Background Art

[0002] In the process of implementing gob-side tunneling, tunnel side support technology is usually used. At present, the main support methods for solving the problems of tunnel side support strength and goaf closure in tunnel side support technology are: U-shaped steel + spray closure, high-water filling materials, and flexible formwork concrete. These three methods require the auxiliary transportation of cement, sand, U-shaped steel, high-water filling materials and other support materials to the underground by mine cars, which increases the auxiliary transportation volume underground and is time-consuming and labor-intensive. In addition, the support strength of U-shaped steel + spray closure and high-water filling materials is low, and cannot meet the support needs of some coal mines with high mining heights and high bearing capacity requirements for tunnel side support walls. Flexible formwork concrete can meet the support needs of coal mines with high mining heights and high bearing capacity requirements for tunnel side support walls, but cement, sand and other materials are very easy to cause dust pollution during loading and unloading.

[0003] Therefore, it is necessary to develop a method for pouring the tunnel side retaining wall by long-distance pipeline transportation, which can directly transport the pouring material into the flexible mold bag and avoid dust pollution.

[0004] Therefore, a method of long-distance pipeline transportation and casting of tunnel side retaining wall is proposed. Summary of the invention

[0005] The object of the present invention is to provide a method for casting a tunnel side supporting wall by long-distance pipeline transportation, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for long-distance pipeline transportation and casting of tunnel side support walls, comprising the following steps; step one: analyzing the production geological conditions of the working face and determining the parameters of the tunnel side support walls; step two: selecting a suitable location to establish a ground pumping station and an underground relay pumping station, wherein the ground pumping station is used to produce casting materials and pump the pumped casting materials to the underground relay pumping station; the underground relay pumping station is used to store the casting materials pumped from the ground pumping station in a mixing system for secondary mixing; step three: slurry proportioning is carried out according to the strength requirements of the tunnel side support wall and the transportability requirements of the casting materials; step four: laying the slurry delivery pipeline, and setting pressure monitoring points at slope points, diameter change points and other areas prone to blockage, and establishing a pressure monitoring system; step five: conducting a comprehensive inspection of the work in step four, handling problems and adjusting equipment in a timely manner according to the inspection results, and starting the transportation work after there are no problems until the support work is completed.

[0007] According to the above technical solution, the production geological conditions of the working face in step one include but are not limited to: testing and analysis of the mechanical properties of the roof rock layer and coal seam.

[0008] According to the above technical solution, the mechanical property test of the roof and floor rock layers and coal seams described in step one adopts coring by drilling holes in the roof, and testing the coring samples.

[0009] According to the above technical solution, the equipment required for establishing the ground pumping station and the underground relay pumping station is selected according to the conveying distance, the pouring project volume and the slump of the pouring material.

[0010] According to the above technical solution, a device for preventing slurry sedimentation and segregation from causing pipeline blockage is arranged every 100 to 200 meters in the slurry delivery pipeline.

[0011] According to the above technical solution, the rotation speed of the device 7 for preventing the slurry from settling and separating to cause pipeline blockage is 3 to 15 r / min.

[0012] According to the above technical scheme, the casting material is transported to the flexible mold bag through the slurry delivery pipeline, and is dehydrated by pressurization in batches, so that the casting material does not shrink when solidifying, solidifies quickly, and has high early strength. The top of the tunnel side supporting wall can be in close contact with the roof, and a certain initial support force can be applied to the roof.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention eliminates manual loading and unloading and mine car transportation, reduces underground equipment, and eliminates underground mixing processes by setting up a ground pumping station and an underground leverage pumping station, and transporting casting materials through a slurry pipeline; it avoids the manpower consumption caused by underground slurrying and the pollution of the working environment caused by dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0016] In the figure: 1-ground pumping station, 2-slurry pipeline, 3-underground relay pumping station, 4-laneside support space, 5-flexible mold bag, 6-laneside support wall, 7-device to prevent slurry settlement and segregation from causing pipeline blockage. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0018] See also Figure 1 , the present invention provides a technical solution: a method for pouring a tunnel side supporting wall by long-distance pipeline transportation, comprising the following steps;

[0019] Step 1: Analyze the production geological conditions of the working face and determine the parameters of the roadside support wall 6;

[0020] Step 2: Select a suitable location to establish a surface pumping station 1 and an underground relay pumping station 3, wherein the surface pumping station 1 is used to produce casting materials and pump the casting materials to the underground relay pumping station 3; the underground relay pumping station 3 is used to store the casting materials pumped from the surface pumping station 1 in a mixing system for secondary mixing. After the secondary mixing is completed, the casting materials are pumped to the underground casting point. When the casting materials reach a certain distance from the top plate, the remaining top connection work is carried out;

[0021] Step three: slurry proportioning according to the strength requirements of the lane side support wall 6 and the transportability requirements of the casting material;

[0022] Step 4: Lay the slurry delivery pipeline 2, and set pressure monitoring points at the slope points, diameter change points and other areas prone to blockage, and establish a pressure monitoring system. The slurry delivery pipeline 2 connects the surface pumping station 1 with the underground relay pumping station 3. The pressure monitoring points are used to monitor the pressure inside the slurry delivery pipeline 2, and real-time monitoring is carried out to prevent leakage and blockage of the slurry delivery pipeline, so as to ensure stable operation of the equipment;

[0023] Step 5: Carry out a comprehensive inspection of the work in step 4, deal with problems and adjust equipment in a timely manner according to the inspection results, and start the transportation work after no problems are found until the support work is completed;

[0024] Specifically, the production geological conditions of the working face in step 1 include but are not limited to: testing and analysis of mechanical properties of roof rock and coal seams;

[0025] Specifically, the mechanical property test of the roof and floor rock layers and coal seams described in step 1 is performed by coring by drilling holes in the roof, and testing the coring samples;

[0026] Specifically, the equipment required to establish the surface pumping station 1 and the underground relay pumping station 3 is selected according to the conveying distance, the amount of pouring work and the slump of the pouring material;

[0027] Specifically, the slurry delivery pipeline 2 is provided with a device 7 for preventing the slurry from settling and separating and causing pipeline blockage every 100 to 200 meters;

[0028] Specifically, the rotation speed of the device 7 for preventing the slurry from settling and separating to cause pipeline blockage is 3 to 15 r / min.

[0029] Specifically, the casting material is transported to the flexible mold bag 5 through the slurry delivery pipeline 2, and is dehydrated by pressurization in batches, so that the casting material does not shrink when solidifying, solidifies quickly, and has high early strength, so that the top of the tunnel side supporting wall can be in close contact with the roof, and a certain initial support force can be applied to the roof.

[0030] The casting material is directly pumped from the ground pumping station 1 to the flexible mold bag 5 through the slurry pipeline 2 and the underground relay pump station 3. When the casting material reaches a certain distance from the top plate, the flow rate of the casting material is controlled by the underground relay pump station 3 to make the flexible mold bag 5 as dense as possible without any gaps. After the top is successfully connected, the grouting pipe is immediately taken out of the flexible mold bag 5 (and a signal is immediately given to stop grouting), and the filling port is tied tightly with a rope to prevent the slurry from overflowing. Finally, the slurry pipeline 2 and the equipment of the ground pumping station 1 and the underground relay pump station 3 are cleaned with clean water, thereby achieving the purpose of long-distance pipeline transportation and casting of the roadside support wall.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for pouring tunnel side support wall by long-distance pipeline transportation, characterized in that: The steps include: Step 1: Analyze the production geological conditions of the working face and determine the parameters of the roadway support wall (6); Step 2: Select a suitable location to establish a surface pumping station (1) and an underground relay pumping station (3), wherein the surface pumping station (1) is used to produce casting materials and pump the cast materials to the underground relay pumping station (3); the underground relay pumping station (3) is used to store the cast materials pumped by the surface pumping station (1) in a mixing system for secondary mixing; Step three: Mix the slurry according to the strength requirements of the lane side support wall (6) and the transportability requirements of the casting material; Step 4: Lay the slurry delivery pipeline (2), set pressure monitoring points at slope points, diameter change points and other areas prone to blockage, and establish a pressure monitoring system; Step 5: Conduct a comprehensive inspection of the work in step 4, deal with problems and adjust equipment in a timely manner based on the inspection results, and start conveying work after no problems are found until the support work is completed.

2. The method for pouring tunnel side supporting wall by long-distance pipeline transportation according to claim 1 is characterized in that: The production geological conditions of the working face in step 1 include but are not limited to: testing and analysis of the mechanical properties of the roof rock layer and coal seam.

3. The method for pouring tunnel side supporting wall by long-distance pipeline transportation according to claim 2 is characterized in that: The mechanical property test of the roof and floor rock layers and coal seams described in step 1 is carried out by coring through roof drilling and testing the coring samples.

4. The method for pouring tunnel side supporting wall by long-distance pipeline transportation according to claim 3 is characterized in that: The equipment required for establishing the surface pumping station (1) and the underground relay pumping station (3) is selected according to the conveying distance, the pouring project volume and the slump of the pouring material.

5. The method for pouring tunnel side supporting wall by long distance pipeline transportation according to claim 4 is characterized in that: The slurry conveying pipeline (2) is provided with a device every 100 to 200 meters to prevent slurry sedimentation and segregation from causing pipeline blockage.

6. The method for pouring tunnel side supporting wall by long distance pipeline transportation according to claim 5 is characterized in that: The rotation speed of the device (7) for preventing slurry sedimentation and segregation from causing pipeline blockage is 3 to 15 r / min.

7. The method for pouring tunnel side supporting wall by long distance pipeline transportation according to claim 6 is characterized in that: The casting material is transported to the flexible mold bag (5) through the slurry delivery pipeline (2), and is dehydrated by pressurization in stages, so that the casting material does not shrink when solidifying, solidifies quickly, and has high early strength, so that the top of the lane side supporting wall can be in close contact with the roof, and a certain initial support force can be applied to the roof.

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