Ground drilling and slurry conveying pipeline laying method for grouting and filling mining engineering
By designing the slurry pipeline routes based on the topography and setting up sand discharge and exhaust valve wells, the problem of pipeline pipe blockage in grouting and filling management in goaf or rock-covered off-stratigraphic areas has been solved, and the slurry transfer capacity has been improved.
Patent Information
- Application Number
- CN202411915246.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-04-29
AI Technical Summary
In the prior art, in grouting and filling treatment in goaf or rock-covered off-stratum, pipelines are prone to reduced conveying capacity and pipe blocking problems due to accumulation of low sandstone points and gathering of middle and high points of air pipelines during the transportation process.
Design a method for laying ground drilling and slurry pipelines for grouting filling and mining projects. By designing the slurry pipeline routes according to the terrain and topography, setting up sand discharge valve wells at low places, and setting up exhaust valve wells at high places to timely discharge sand and air to avoid pipe blockage.
It effectively avoids the problem of pipe blockage caused by sand sinking and air accumulation, improves the ability of pipeline slurry, and solves the problem of reduced conveying capacity and pipe blockage caused by terrain and topography during long-distance pipeline laying.
Smart Images
Figure CN119900607A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of goaf filling, and in particular to a method for laying out ground drilling and grouting pipelines in a grouting filling mining project. Background Art
[0002] Pipeline slurry transportation technology is an important part of the implementation of grouting filling treatment technology in goaf areas, and it is directly related to the grouting capacity and stability. In recent years, with the large-scale exploitation of coal resources, a large number of goaf areas have been formed. The exploitation of underground coal seams will inevitably cause the settlement and migration of overlying rock strata. The changes in the strata have further developed into negative problems such as water inrush and sand burst, and surface subsidence. Among them, the problem of surface subsidence is particularly obvious, which not only causes the destruction of fertile fields and cultivated land and the damage of buildings, but also easily causes environmental problems such as soil erosion and land desertification. At present, for the problem of surface subsidence, the delamination grouting and subsidence reduction technology has become a technology of concern because it does not affect the normal mining of the mine, but there are still many problems in its specific implementation of surface pipeline transportation.
[0003] The common methods of laying pipelines currently have the following problems: 1. Affected by the topography, if the pipeline is laid horizontally during field laying, the cost of laying the pipeline is extremely high; 2. When the commonly used method of laying according to the terrain is adopted, there is a phenomenon of sand settling and blocking the pipeline at the low point in actual application. There is a phenomenon of air accumulation at the high point of the pipeline laying, which greatly affects the efficiency and stability of slurry delivery.
[0004] The patent document with publication number 2023225037550 discloses a grouting pipeline structure for adjacent goaf areas in underground coal mines, and introduces a pipeline design for filling goaf areas. However, the patent document solves the problem of laying pipelines with uniformly changing elevations, which has great limitations in surface applications with constantly changing terrain elevations, and cannot solve the problems that arise when laying pipelines in undulating terrain.
[0005] In view of this, the present invention is proposed. Summary of the invention
[0006] The purpose of the present invention is to provide a method for ground drilling and grouting pipeline laying in a grouting filling mining project, which can solve the problems of reduced pipeline transportation capacity and pipe blockage caused by the accumulation of sediment at low points and high points in the air pipeline during the grouting filling treatment grouting pipeline laying process in the goaf or overburden separation area in the prior art.
[0007] The present invention provides a method for ground drilling and grouting pipeline layout in a grouting filling mining project, comprising the following steps:
[0008] Design the slurry pipeline route according to the topography of the slurry station and grouting area;
[0009] Drilling holes in the grouting area;
[0010] Determine the elevation change of the slurry pipeline route, and design the positions of the sand discharge valve well, exhaust valve well and branch pipe valve well according to the elevation change and the position of the grouting hole; the sand discharge valve well is set at a relatively low point of the pipeline laying elevation in a low-lying area; the exhaust valve well is set at a relatively high point of the pipeline laying elevation in a high-lying area; the branch pipe valve well is set at the preset branch pipe interface;
[0011] Dig trenches for slurry delivery pipelines, build sand discharge valve wells, exhaust valve wells and branch pipe valve wells;
[0012] Lay the slurry delivery pipeline and connect it with the sand discharge valve well, exhaust valve well and branch valve well. The branch valve well is connected to the grouting hole through the slurry delivery branch pipe, and then backfill and compact in layers.
[0013] Preferably, the slurry delivery pipeline is formed by laying a plurality of large-diameter pipelines and small-diameter pipelines in parallel.
[0014] Preferably, in the early stage of grouting, the large diameter pipe is used for grouting; and in the later stage of grouting, the small diameter pipe is used for grouting.
[0015] Preferably, the orifices of the grouting holes adopt a centralized orifice design.
[0016] Preferably, the bottom of the slurry delivery pipeline groove is leveled by laying bottom sand of not less than 150 mm.
[0017] Preferably, the slurry conveying pipeline groove is a trapezoidal groove.
[0018] Preferably, the layered backfilling includes one or more of medium-coarse sand backfilling, crushed stone backfilling, gravel backfilling and original soil backfilling.
[0019] Preferably, pressure sensors are provided on the pipelines at upstream and downstream positions of each of the sand discharge valve well and the exhaust valve well to monitor the pressure in the pipeline.
[0020] Preferably, the pressure sensor uses a wireless signal transmission tool of a solar photovoltaic panel to transmit a signal to a data terminal to monitor the pressure in the pipeline.
[0021] Preferably, when designing the route of the slurry delivery pipeline, the principle is to reduce terrain undulations, reduce crossing buildings, and reduce elevation changes when laying the pipeline.
[0022] The present invention has at least the following beneficial effects:
[0023] The slurry pipeline laying method designed according to the topography of the present invention sets a special exhaust and sand discharge valve well to timely discharge the sediment and air in the slurry pipeline, thereby avoiding the problem of pipe blockage and improving the slurry conveying capacity of the pipeline. It solves the problem of reduced pipeline conveying capacity and pipe blockage caused by grouting and filling in goaf areas or overlying rock delamination areas caused by topography during long-distance pipeline laying, and the accumulation of sediment at low points and high points in the air pipeline during the pipeline transportation process. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 This is a schematic diagram of the slurry pipeline valve well and topographic profile provided by the present invention.
[0026] Figure 2 This is a plan view schematic diagram of the working face and slurry pipeline layout provided by the present invention.
[0027] Figure 3 This is a schematic cross-sectional view of the groove of the slurry delivery pipeline provided by the present invention.
[0028] Figure 4 This is a schematic cross-sectional view of the valve well structure provided by the present invention.
[0029] Figure 5 A schematic diagram of layered backfilling of a slurry pipeline trench provided by the present invention.
[0030] Explanation of the reference numerals in the accompanying drawings: 1. Pressure sensor; 2. Exhaust valve well; 3. Bottom sand; 4. Sand discharge valve well; 5. Branch valve well; 6. Slurry pipeline; 7. Slurry branch pipe; 8. Grouting hole; 9. Drilling target; 10. Settlement influence area; 11. Cover plate; 12. Well wall; 13. Bottom plate one; 14. Bottom plate two; 15. Brick arch; H. Working face length; S. Cutting eye position. DETAILED DESCRIPTION
[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.
[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] Example
[0035] This embodiment provides a method for ground drilling and grouting pipeline layout in a grouting filling mining project, comprising the following steps:
[0036] like Figures 1 to 2 As shown in the figure, for the project 10 in the area affected by filling settlement, the working face length is H, the cutting position is H, the distance between the slurry station and the grouting area of the goaf is 3 kilometers, and the terrain between the two is undulating. According to the topography and features of the slurry station and the grouting area as well as the characteristics of the buildings (structures), the route of the slurry pipeline is reasonably designed. The principle is to minimize the terrain undulation and the crossing of buildings (structures) as much as possible, and at the same time, minimize the elevation changes during pipeline laying.
[0037] The slurry delivery pipeline route passes through each preset grouting area, and a branch pipe valve well 5 is set in each grouting area. The branch pipe valve well 5 is set at the preset branch pipe interface.
[0038] According to the position of the drilling target point 9 and the geological conditions of the working face design, the grouting hole 8 is drilled in the grouting area using the directional drilling technology, and a centralized hole position is set.
[0039] Measure the elevation change of the slurry pipeline route, and design the positions of the sand discharge valve well 4 and the exhaust valve well 2 according to the elevation change; the sand discharge valve well 4 is set at a relatively low point of the pipeline laying elevation in low terrain; the exhaust valve well 2 is set at a relatively high point of the pipeline laying elevation in high terrain; the exhaust valve well 2 and the sand discharge valve well 4 must be set at the terrain elevation conversion point for exhaust and sand removal.
[0040] Design a sand removal and air exhaust inspection plan based on grouting monitoring data and slurry properties.
[0041] Excavation of slurry pipeline trenches, such as Figure 3 As shown, the specification is a trapezoidal trench with a width of 4 meters at the top, 3 meters at the bottom and a depth of 1.5 meters. Four parallel pipes are laid, three large-diameter pipes and one small-diameter pipe. Two are used for grouting, and the other two are used for replacement grouting when the pipes are abnormal.
[0042] Build the sand discharge valve well 4, the exhaust valve well 2 and the branch pipe valve well 5. In this embodiment, the preferred valve well structure specifications are as follows: Figure 4 As shown, it is 4 meters long, 3 meters wide and 2 meters deep, and is composed of a prefabricated concrete cover plate 11, a brick well wall 12, a C25 plain concrete bottom plate 13, a C15 plain concrete bottom plate 2 14 and a brick arch 15.
[0043] The bottom of the slurry pipeline trench is leveled by laying bottom sand 3 with a uniform thickness of not less than 150 mm.
[0044] Lay the welded slurry delivery pipeline 6 and connect it to the sand discharge valve well 4, the exhaust valve well 2 and the branch pipe 7 valve well 5, connect the slurry delivery branch pipe 7 from the branch pipe valve well 5 to the grouting hole 8, and then follow the steps below: Figure 5 In the method shown, medium-coarse sand is used for backfilling first, and then original soil, medium-coarse sand, crushed stone chips or gravel with a maximum particle size of <40mm that meets the requirements are used for backfilling. Finally, the original soil is used for backfilling and compaction. After compaction, the thickness of each layer is 100 to 200mm, and the layered backfilling is more compact.
[0045] A pressure sensor 1 is provided on each pipeline at a position about 10 meters upstream and downstream of each sand discharge valve well 4 and exhaust valve well 2 to monitor the pressure change in the pipeline and handle the abnormal state of the pipeline in time.
[0046] The pressure sensor 1 uses a wireless signal transmission tool of a solar photovoltaic panel to transmit a signal to a data terminal to monitor the pressure in the pipeline.
[0047] The specific use process of this embodiment is as follows:
[0048] Two large-diameter pipes are used to inject grout to the target underground layer;
[0049] During the grouting process, large particles in fly ash, gangue powder and other raw materials in the slurry station and the pumped gas accumulate at different pipeline locations, such as gas accumulation at high points of the pipeline elevation and sediment accumulation at low points;
[0050] The data terminal showed that the pressures in the front and rear pipes of the sand discharge valve and exhaust valve of a certain pipeline were inconsistent;
[0051] According to the pressure data, there is sediment accumulation, which reduces the local flow pipe diameter and affects the permeability of the slurry. Hereinafter, this pipeline is referred to as an abnormal pressure pipeline;
[0052] After flushing the pipe with clean water, temporarily close the abnormal pressure pipe and use the spare pipe to continue grouting;
[0053] Open the sand discharge valve of the abnormal pressure pipeline, insert a thin water pipe to flush the internal sediment until it is completely discharged, and then close the sand discharge valve;
[0054] The pipeline with abnormal pressure is transformed into a normal standby pipeline;
[0055] When pressure abnormalities occur in other pipelines later, this operation is repeated;
[0056] During grouting, if the data terminal shows that the pressure is normal but the flow rate is reduced, or the overall pressure is higher than that of the same flow rate, it can be judged that a large amount of gas may have accumulated inside the pipeline;
[0057] Exhaust gas until slurry flows out continuously and then close it;
[0058] Open the exhaust valves of the pipeline in sequence along the slurry flow direction of the pipeline;
[0059] The work of eliminating and managing two abnormal conditions in the pipeline has been completed, and this cycle has been continued.
[0060] In the early stage of grouting, the space in the formation is large, so large-diameter pipes and large-flow grouting can be used; at the end of grouting, the pressure in the borehole increases and can no longer meet the requirements of large-flow grouting, so small-diameter pipe grouting is used instead.
[0061] In summary, the slurry pipeline laying method designed according to the terrain and landform of the present invention sets a special exhaust and sand discharge valve well to timely discharge the sand and air in the slurry pipeline, thereby avoiding the problem of pipe blockage and improving the pipeline slurry transport capacity. It solves the problem of reduced pipeline transportation capacity and pipe blockage caused by grouting and filling in the goaf or overlying rock delamination area caused by terrain and landform reasons during the laying of slurry pipelines during the transportation process.
[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for ground drilling and grouting pipeline layout in a grouting and filling mining project, characterized in that: The steps include: Design the slurry pipeline route according to the topography of the slurry station and grouting area; Drilling holes in the grouting area to form grouting holes; Determine the elevation change of the slurry pipeline route, and design the positions of the sand discharge valve well, exhaust valve well and branch pipe valve well according to the elevation change and the position of the grouting hole; the sand discharge valve well is set at a relatively low point of the pipeline laying elevation in a low-lying area; the exhaust valve well is set at a relatively high point of the pipeline laying elevation in a high-lying area; the branch pipe valve well is set at the preset branch pipe interface; Dig trenches for slurry delivery pipelines, build sand discharge valve wells, exhaust valve wells and branch pipe valve wells; Lay the slurry delivery pipeline and connect it with the sand discharge valve well, exhaust valve well and branch valve well. The branch valve well is connected to the grouting hole through the slurry delivery branch pipe, and then backfill and compact in layers.
2. The method for ground drilling and grouting pipeline layout for grouting and filling mining engineering according to claim 1 is characterized in that: The slurry delivery pipeline is formed by laying a plurality of large-diameter pipelines and small-diameter pipelines in parallel.
3. The method for ground drilling and grouting pipeline layout in grouting and filling mining engineering according to claim 2 is characterized in that: In the early stage of grouting, the large-diameter pipe is used for grouting; in the late stage of grouting, the small-diameter pipe is used for grouting.
4. The method for ground drilling and grouting pipeline layout for grouting and filling mining engineering according to claim 1 is characterized in that: The orifices of the grouting holes adopt a centralized orifice design.
5. The method for ground drilling and grouting pipeline layout in grouting and filling mining engineering according to claim 1 is characterized in that: The bottom of the slurry delivery pipeline trench is leveled by laying bottom sand of no less than 150 mm.
6. The method for ground drilling and grouting pipeline layout for grouting and filling mining engineering according to claim 1, characterized in that: The slurry conveying pipeline groove is a trapezoidal groove.
7. The method for ground drilling and grouting pipeline layout in grouting and filling mining engineering according to claim 1, characterized in that: The layered backfilling includes one or more of medium-coarse sand backfilling, crushed stone backfilling, gravel backfilling and original soil backfilling.
8. The method for ground drilling and grouting pipeline layout in grouting and filling mining engineering according to claim 1, characterized in that: Pressure sensors are provided on the pipelines at upstream and downstream positions of each of the sand discharge valve well and the exhaust valve well to monitor the pressure in the pipeline.
9. The method for ground drilling and grouting pipeline layout for grouting and filling mining engineering according to claim 8, characterized in that: The pressure sensor uses a wireless signal transmission tool of a solar photovoltaic panel to transmit a signal to a data terminal to monitor the pressure in the pipeline.
10. The method for ground drilling and grouting pipeline layout in grouting and filling mining engineering according to claim 1, characterized in that: When designing the slurry pipeline route, the principles are to reduce terrain undulations, reduce crossing buildings, and reduce elevation changes when laying the pipeline.