CN110805470B - Cable protection method for signal transmission of coal mine underground plate water damage monitoring system - Google Patents
Cable protection method for signal transmission of coal mine underground plate water damage monitoring system Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/02—Suspension devices for tubes or the like, e.g. for ventilating ducts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The invention relates to a cable protection method, belongs to the technical field of coal mining, and particularly relates to a cable protection method for signal transmission of a coal mine underground floor water damage monitoring system. The method mainly comprises the following steps of protecting three key parts: the drilling hole opening is built with a foundation protection platform, the cable passing through the roadway is subjected to grooving, pipe penetration embedding and cable upper wall suspension laying height design, and therefore the transmission cable can be effectively prevented from being damaged by stratum stress and mechanical stress.
Description
Technical Field
The invention relates to a cable protection method, belongs to the technical field of coal mining, and particularly relates to a cable protection method for signal transmission of a coal mine underground floor water damage monitoring system.
Background
Along with gradual depletion of shallow coal resources, the mining level of a coal field continuously extends to the deep part, the situation is seriously affected by the water damage of the facing bottom plate, and the monitoring of the water damage of the bottom plate of the coal bed is very important. For real-time monitoring of the water source lifting condition of the coal seam floor water filling and the fracture development condition of the floor water filling channel, a water damage monitoring system comprising an electrical method, a monitoring sensor and a micro-seismic monitoring instrument is generally adopted for monitoring, usually, a large number of water temperature and water pressure sensors, stress strain sensors, multi-frequency continuous electrical method electrodes and micro-seismic sensors are embedded in roadways on two sides of a working face at intervals, and signals collected by the sensors in real time are transmitted out through cables.
The water damage monitoring system generally monitors the pushing and mining process of a working face, and in the pushing and mining process, due to the active damage of coal cutting equipment, hydraulic supports and other coal mining equipment to a monitoring cable, the passive damage of a working face top plate, a coal pillar side slope collapse and a coal bed bottom plate bottom bulge to the monitoring cable, the monitoring cable is very easy to damage in the forms of shearing, stretching and the like, and the transmission of monitoring data is forced to be interrupted. The damage occurring position is generally at the drilling hole of the sensor embedded bottom plate, passes through the whole section of the roadway and the roadway outer wall wire hanging section. The traditional cable protection method of three easily-damaged positions comprises the following steps: firstly, a longer cable is reserved, secondly, an armored cable wrapped with materials such as steel wires, steel belts and aluminum belts is utilized, and thirdly, the position of a roadway hanging line is selected at the bottom corner of the outer wall. The cable protection method has the advantages that the generated tensile damage can be effectively avoided, but the method has the following defects: firstly, the armored cable is heavy and inconvenient to lay manually underground, secondly, the outer upper bottom corner hanging wire lacks theoretical basis, and thirdly, the cable protection method can not solve the problem that the cable is damaged due to huge shearing force formed by roof collapse, roadway rib stripping and bottom plate bottom heave at three positions.
The steel wire armored cable manufactured by the method for manufacturing the steel wire armored cable in the prior art respectively consists of 6 parts from inside to outside, namely a cable forming wire core, an inner sheath, a steel wire armored layer, a non-woven fabric buffer layer, a steel belt tightening layer and an outer sheath. The steel wire armored cable disclosed in the patent has certain mechanical strength, but the strength can not resist huge damage caused by stress release of coal mining machinery and a goaf in the working face push mining process.
The cable manufactured by another manufacturing method in the prior art has a structure which consists of 5 parts, namely a copper cable core, a silicon rubber insulating layer, a tinned copper wire shielding layer, a steel tape armor layer and a polyolefin sheath, from inside to outside in sequence. The cable has the characteristics of good insulativity, compressive resistance and corrosion resistance, but has relatively low tensile strength and is difficult to resist huge mechanical stress and formation stress damage of the cable in the working face push-mining process.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
The invention mainly aims to solve the technical problems in the prior art and provides a method for protecting a cable for signal transmission of a water damage monitoring system of a bottom plate of a coal mine. The method mainly comprises the following steps of protecting three key parts: the drilling hole opening is built with a foundation protection platform, the cable passing through the roadway is subjected to grooving, pipe penetration embedding and cable upper wall suspension laying height design, and therefore the transmission cable can be effectively prevented from being damaged by stratum stress and mechanical stress.
In order to solve the problems, the scheme of the invention is as follows:
a method for protecting a cable for signal transmission of a coal mine underground plate water damage monitoring system comprises the following steps: building a foundation protection platform at a drilling hole, comprising the following steps: building a cuboid concrete structure foundation protection platform lower than a roadway bottom plate around a sensor embedded drilling hole, reserving a transmission cable routing space in the protection platform, and reserving cable length in the space to ensure that the length is more than 3 times of the surplus length from the hole to a cable leading-out position.
A method for protecting cables for signal transmission of a coal mine underground floor water damage monitoring system comprises the step of digging grooves and penetrating pipes for cables passing through a roadway and burying the grooves and the penetrating pipes, and comprises the following steps: excavating an effective depth to pass through a roadway cable trench, enabling transmission cables to penetrate through high-pressure-resistant rubber pipes in a bundled mode, burying the transmission cables in the roadway cable trench in a vertical roadway direction, covering soil on the high-pressure rubber pipes and compacting the high-pressure rubber pipes, reserving cables at outlets on two sides of the rubber pipes by more than 3 times of surplus length, wherein the effective depth is the depth of the cables, and the buried depth is larger than that of roadway bottom plate rails and drainage ditch equipment.
A method for protecting cables for signal transmission of a coal mine underground floor water damage monitoring system comprises a cable upper wall hanging and laying height design step, wherein after a transmission cable is led out from an outer wall through a roadway, the transmission cable is hung on the upper wall of a vertical roadway side wall, and a hanging position determining method comprises the following steps:
a model construction sub-step, namely providing a roadway deformation destruction mathematical model considering mining stress conditions based on 'key layer theory of rock stratum control' and a mole-coulomb criterion, and setting boundary conditions and initial conditions;
a deformation simulation substep, which is to simulate and calculate the deformation characteristics of the roadway top plate, the roadway bottom plate and the surrounding rock of the outer wall under the mining stress condition by using a numerical method;
a space estimation substep, which jointly estimates the space range of the broken rock mass occupying the roadway in the goaf based on the direct roof caving filling rule and the stope overlying strata movement rule;
and an interval estimation substep, comprehensively determining the residual height range of the mining roadway as a cable suspension height interval based on the deformation characteristics and the space range of the goaf crushed rock mass extruding roadway.
Preferably, the cable protection method for signal transmission of the underground coal mine floor water damage monitoring system comprises the following model construction substeps:
step 1, constructing a conceptual model, and generalizing the number of layers of a geologic body, a layered mechanical structure and each layer of inclination angle according to the geological conditions of a research working face;
and 2, constructing a mathematical model control equation, and describing the mechanical characteristics of the geologic rock under the mining disturbance condition by using a mathematical model formed by a displacement field equation of rock deformation and damage and a rock plastic damage criterion equation.
Step 3, setting solution conditions and initial conditions, keeping the stress state of the coal seam balanced before mining activities do not occur, and expressing a vertical and horizontal stress calculation formula without considering structural stress as follows:
σv＝γ*H
in the formula (I), the compound is shown in the specification,
represents the horizontal stress;
represents the vertical stress; v represents the rock poisson's ratio; gamma denotes the average formation heaviness; h represents the buried depth;
and 4, setting boundary conditions, and giving displacement characteristic boundaries of the top, the bottom and the two sides of the model according to the model generalization result.
A method for protecting cables for signal transmission of a coal mine underground plate water damage monitoring system comprises at least two of the following steps:
building a foundation protection platform at a drilling hole, comprising the following steps: building a cuboid concrete structure foundation protection platform lower than a roadway bottom plate around a sensor embedding drilling hole, reserving a transmission cable routing space in the protection platform, and reserving cable length in the space to ensure that the length of the cable is more than 3 times of the extra length from the hole to a cable leading-out position;
the method comprises the following steps of digging a groove in a cable passing through a roadway and embedding a pipe, wherein the steps comprise: excavating a cable trench passing through a roadway with an effective depth, bundling transmission cables to penetrate through a high-pressure-resistant rubber pipe, burying the transmission cables in the cable trench passing through the roadway in a vertical roadway direction, covering soil on the high-pressure rubber pipe and compacting, reserving cables at outlets on two sides of the rubber pipe by more than 3 times of the surplus length, wherein the effective depth is the depth of the cables, which is greater than the depth of a roadway bottom plate track and drainage ditch equipment;
and (3) designing the cable upper wall hanging and laying height, and after the transmission cable is led out from the outer wall through the roadway, hanging the transmission cable on the upper wall perpendicular to the side wall of the roadway.
Preferably, in the method for protecting the cable for signal transmission of the underground coal mine floor water damage monitoring system, the design step of hanging and laying the cable on the wall comprises the following steps: a model construction sub-step, namely providing a roadway deformation destruction mathematical model considering mining stress conditions based on 'key layer theory of rock stratum control' and a mole-coulomb criterion, and setting boundary conditions and initial conditions;
a deformation simulation substep, which is to simulate and calculate the deformation characteristics of the roadway top plate, the roadway bottom plate and the surrounding rock of the outer wall under the mining stress condition by using a numerical method;
a space estimation substep, which jointly estimates the space range of the broken rock mass occupying the roadway in the goaf based on the direct roof caving filling rule and the stope overlying strata movement rule;
and an interval estimation substep, comprehensively determining the residual height range of the mining roadway as a cable suspension height interval based on the deformation characteristics and the space range of the goaf crushed rock mass extruding roadway.
Therefore, the invention has the advantages that: the formed cable drilling hole base platform protection, roadway passing grooving-pipe penetrating burying and cable suspension position determining method can effectively avoid the transmission cable from being damaged by formation stress and mechanical stress.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the disclosure.
FIG. 1 is a schematic view of a transmission cable bore hole and a method for protecting a cable passing through a roadway section
FIG. 2 is a schematic view of a method for determining a hanging position of an outer side cable of a roadway
Wherein, I is a schematic diagram of the breaking process of mining 'O-X' on the working face, II is a combination of the coal seam and the overlying strata on the A-A 'section of the working face before mining, and III is a schematic diagram of the deformation characteristics of the coal seam and the overlying strata on the A-A' section of the working face after mining
FIG. 3 is a schematic view of the hanging position and mode of the roadway outer side cable
Embodiments of the present invention will be described with reference to the accompanying drawings.
In the figure, 1-1 indicates a coal seam roof rock stratum, 1-2 indicates a working face roadway, 1-3 indicates a working face protection coal pillar, 1-4 indicates an inner wall of the roadway, 1-5 indicates an implementation working face, 1-6 indicates a drilled pit, 1-7 indicates a drainage ditch, 1-8 indicates a monitoring cable leading-out section, 1-9 indicates a basic protection platform, 1-10 bottom plate drilled holes, 1-11 coal seam bottom plates, 1-12 roadway bottom plates and 1-13 cable protection high-pressure rubber pipes.
In the figure, 2-1 is implemented with a working face rail lane, 2-2 is implemented with a working face belt lane, 2-3 is implemented with a working face old roof, 2-4 is implemented with a working face direct roof, 2-5 is implemented with a solid coal seam, 2-6 hanging line positions, 2-7 lane spaces, 2-8 is implemented with a working face coal seam to be mined, and 2-9 is implemented with a mined-out area crushed rock mass.
In the figure, 3-1 indicates a top plate of the roadway, 3-2 indicates an outer wall top angle of the roadway, 3-3 indicates an outer wall of the roadway, and 3-4 indicates a bottom plate of the roadway.
Detailed Description
Examples
The invention provides a comprehensive protection method for a transmission cable, which mainly comprises the following steps of protecting three key parts: the method comprises the steps of drilling holes, building foundation protection platforms, digging grooves for cables passing through a roadway, embedding through pipes, and hanging and laying the cables on a wall. The corresponding cable protection method is realized by the following technical scheme.
The drilling hole is used for constructing a foundation protection platform, namely a rectangular concrete structure foundation protection platform with the height of 30cm and lower than the bottom plate of a roadway is constructed around the drilling hole of the embedded sensor, so that the instantaneous shearing force of broken stones collapsed on a top plate to the outlet section of a cable drilling hole is effectively reduced, and the cutting damage of a coal cutter in the coal seam mining process is effectively avoided; a transmission cable routing space is reserved, the length of a cable reserved in the space is more than 3 times of the extra length from a drilling hole for embedding the sensor to a cable leading-out position of the basic protection platform, and the tensile stress generated by the tensile deformation of the bottom plate is effectively counteracted.
The cable that crosses the tunnel dig groove-poling bury underground, dig 30cm deep tunnel cable ditch promptly, transmission cable bunches and passes high pressure resistant rubber tube, perpendicular tunnel trend is buried in crossing tunnel cable ditch to earthing compaction, the export of rubber tube both sides is reserved the cable more than 3 times extra length, effectively offsets the tensile stress that bottom plate tensile deformation produced.
The method for determining the hanging position of the cable is characterized in that after the transmission cable is led out from the outer wall through the roadway, the vertical roadway side wall is hung on the upper wall, and the method for determining the hanging position comprises the following steps: providing a roadway deformation failure mathematical model considering mining stress conditions based on 'key layer theory of rock stratum control' and a mole-coulomb criterion, and setting boundary conditions and initial conditions; simulating and calculating deformation characteristics of a roadway top plate, a roadway bottom plate and surrounding rock of the outer wall under the mining stress condition by using a numerical method; estimating the space range of the crushed rock mass occupying the roadway in the goaf based on the direct roof caving filling rule and the stope overlying rock movement rule; and fourthly, comprehensively determining the residual height range of the mining roadway as a cable suspension height interval by combining the results of the calculation and analysis.
The roadway deformation failure mathematical model modeling considering the mining stress condition is mainly completed by three steps.
The method comprises the following steps of constructing a conceptual model, and generalizing the number of layers of a geologic body, a layered mechanical structure and each layer inclination angle according to the geological conditions of a research working face.
And secondly, constructing a mathematical model control equation:
and describing the mechanical characteristics of the geologic rock under the mining disturbance condition by using a mathematical model consisting of a displacement field equation of rock deformation and damage and a rock plastic damage criterion equation.
Wherein, the displacement field equation of rock mass deformation and damage is expressed as follows:
in the formula, K is the absolute permeability of the porous medium; mu is the fluid viscosity; rho is the fluid density and p is the groundwater pressure; g is shear modulus; v is the drainage Poisson's ratio of the medium; α is the Biot coefficient; g ═ 2E (1+ ν), E is the medium elastic modulus, and u is the displacement in the x-axis, y-axis, and z-axis directions, respectively;
the influence of a seepage field on the solid framework is reflected, and the essence of the method is that the stress field of the solid framework is influenced by the pore pressure of the fluid, so that the deformation of the solid framework is influenced.
The criterion of rock mass plastic damage adopts a transformation form of a molar-coulomb criterion shear stress failure criterion, and is expressed as follows:
in the formula I1Is the first invariant of effective stress, J2Is the effective stress offset by a second invariant; alpha is alpha1，K1Internal angle of friction with the rock, respectively
And viscosity c.
I1＝σ1+σ2+σ3＝σx+σy+σz
J2＝[(σ1-σ2)2+(σ2-σ3)2+(σ3-σ1)2]/6
Thirdly, setting a solution condition:
the initial conditions are set so that the stress state of the coal seam is kept balanced before the excavation activity is not carried out. Under the condition of not considering the construction stress, the calculation formula of the vertical stress and the horizontal stress is expressed as follows:
σv＝γ*H
in the formula (I), the compound is shown in the specification,
represents the horizontal stress;
represents the vertical stress; v represents the rock poisson's ratio; gamma denotes the average formation heaviness; h denotes the buried depth.
Setting of boundary conditions: and giving displacement characteristic boundaries at the top, the bottom and the two sides of the model according to the model generalization result.
Example 2
The method for protecting the cable for signal transmission of the coal mine underground bottom plate water damage monitoring system is used for protecting the cable for monitoring the bottom plate water damage monitoring signal transmission of a certain coal mine A working surface in the North China coal field.
Firstly, building base protection platforms 1-10 (numbers: T1 and T2 … … T10) with the sizes of 100cm (length) x 100cm (width) x 80cm (height) around Z1 drilled holes and Z2 drilled holes … … Z10 drilled holes 1-11 leaking parts corresponding to drilled pits 1-6 of No. 1 and No. 2 … … 10 in the inner upper 1-4 of the working face A, wherein the protection platforms are made of concrete structures, and the thicknesses of the wall bodies and the top covers of the base protection platforms are 20cm and 15cm respectively. The building steps are as follows: firstly, constructing a wall part; secondly, laying cables inside the protection platform, and reserving the cables to be 500cm in length; thirdly, leading out a cable from the bottom corner of the wall body; and fourthly, constructing a top cover part.
Secondly, leading out cables from each protection platform 1-10 to form bundles, penetrating the cables through high-pressure resistant rubber pipes 1-14, perpendicular to the trend of a roadway, excavating a threading groove with the section dimension of 30cm (width) multiplied by 80cm (depth), wherein the threading groove passing through the rail adopts a cut penetrating mode, burying the rubber pipes 1-10 wrapped with transmission cables at the depth of 50cm below a bottom plate rail 1-8, and earthing, backfilling and compacting.
Finally, constructing a concept model of mining surrounding rock deformation and damage of the working face A; on the basis of the generalization result, a corresponding deformation and damage mathematical model is given, wherein the model comprises a control equation, an initial condition and a boundary condition; and simulating and calculating the surrounding rock deformation characteristics of the mining roadway of the working face by using Comsol numerical simulation software according to the well field rock physical and mechanical parameter test result. And (3) drawing a schematic diagram (figure 2) of surrounding rock deformation and broken rock mass 2-11 filling characteristics of the mining track roadway of the working face A by combining the actual observation result of roadway deformation of the goaf of the adjacent working face, determining that the deformation and damage degree at the vertex angle position 2-6 of the roadway outer wall 3-1 is minimum, and hanging the transmission cable on the upper wall to the vertex angle positions 2-6 and 3-2 of the outer wall.
And in the later stage, according to the observation of the stoping process of the working face A, the deformation of the bottom heave and the outer wall of the roadway on the two sides of the working face A is serious, the crushing body formed by the caving of the top plate fills the space below the center line height of the roadway, the space above the center line is remained, and the monitoring data transmission in the later stage is normal, which indicates that the embodiment of the method is successful.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Through analysis, the coal mine floor water damage monitoring cable can effectively resist the damage of coal mining mechanical stress and goaf stratum stress at three positions of a drilling hole, a full section passing through a roadway and a roadway side wall hanging line section, and can realize continuous transmission of monitoring signals.
In this embodiment, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as may be understood by those of ordinary skill in the art.
It is noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A method for protecting a cable for signal transmission of a coal mine underground plate water damage monitoring system is characterized by comprising the following steps:
building a foundation protection platform at a drilling hole, comprising the following steps: building a cuboid concrete structure foundation protection platform lower than a roadway bottom plate around a sensor embedding drilling hole, reserving a transmission cable routing space in the protection platform, and reserving cable length in the space to ensure that the length of the cable is more than 3 times of the extra length from the hole to a cable leading-out position;
the method comprises the following steps of digging a groove in a cable passing through a roadway and embedding a pipe, wherein the steps comprise: excavating a cable trench passing through a roadway with an effective depth, bundling transmission cables to penetrate through a high-pressure-resistant rubber pipe, burying the transmission cables in the cable trench passing through the roadway in a vertical roadway direction, covering soil on the high-pressure rubber pipe and compacting, reserving cables at outlets on two sides of the rubber pipe by more than 3 times of the surplus length, wherein the effective depth is the depth of the cables, which is greater than the depth of a roadway bottom plate track and drainage ditch equipment;
and (3) designing the cable upper wall hanging and laying height, and after the transmission cable is led out from the outer wall through the roadway, hanging the transmission cable on the upper wall perpendicular to the side wall of the roadway.
2. The method for protecting the cable for signal transmission of the underground coal mine floor water damage monitoring system according to claim 1, wherein the step of designing the hanging and laying height of the cable on the upper wall comprises the following steps:
a model construction sub-step, namely providing a roadway deformation destruction mathematical model considering mining stress conditions based on 'key layer theory of rock stratum control' and a mole-coulomb criterion, and setting boundary conditions and initial conditions;
a deformation simulation substep, which is to simulate and calculate the deformation characteristics of the roadway top plate, the roadway bottom plate and the surrounding rock of the outer wall under the mining stress condition by using a numerical method;
a space estimation substep, which jointly estimates the space range of the broken rock mass occupying the roadway in the goaf based on the direct roof caving filling rule and the stope overlying strata movement rule;
and an interval estimation substep, comprehensively determining the residual height range of the mining roadway as a cable suspension height interval based on the deformation characteristics and the space range of the goaf crushed rock mass extruding roadway.
3. The method for protecting the cable for signal transmission of the underground coal mine floor water damage monitoring system according to claim 2, wherein the model construction substep specifically comprises:
step 1, constructing a conceptual model, and generalizing the number of layers of a geologic body, a layered mechanical structure and each layer of inclination angle according to the geological conditions of a research working face;
step 2, constructing a mathematical model control equation, and describing mechanical characteristics of the geologic body and rock under the mining disturbance condition by using a mathematical model formed by a displacement field equation of rock deformation and damage and a rock plastic damage criterion equation;
step 3, setting solution conditions and initial conditions, keeping the stress state of the coal seam balanced before mining activities do not occur, and expressing a vertical and horizontal stress calculation formula without considering structural stress as follows:
σv＝γ*H
in the formula (I), the compound is shown in the specification,
represents the horizontal stress;
represents the vertical stress; v represents the rock poisson's ratio; gamma denotes the average formation heaviness; h represents the buried depth;
and 4, setting boundary conditions, and giving displacement characteristic boundaries of the top, the bottom and the two sides of the model according to the model generalization result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911042087.8A CN110805470B (en) | 2019-10-30 | 2019-10-30 | Cable protection method for signal transmission of coal mine underground plate water damage monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911042087.8A CN110805470B (en) | 2019-10-30 | 2019-10-30 | Cable protection method for signal transmission of coal mine underground plate water damage monitoring system |
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| CN110805470A CN110805470A (en) | 2020-02-18 |
| CN110805470B true CN110805470B (en) | 2021-06-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104466872A (en) * | 2014-12-12 | 2015-03-25 | 西安科技大学 | Protection structure for coal mine gob floor monitoring lines and buried method thereof |
| JP2018044362A (en) * | 2016-09-14 | 2018-03-22 | ケイコン株式会社 | Method for easily constructing tunnel watchman passage using l-shaped precast concrete product |
| CN109137998A (en) * | 2018-10-18 | 2019-01-04 | 中铁隧道股份有限公司 | Cross the existing electric power piping lane protection structure and its construction method of tunnel foundation pit |
| CN109713613A (en) * | 2018-12-20 | 2019-05-03 | 中国华冶科工集团有限公司 | Rail roadway cable laying method and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466872A (en) * | 2014-12-12 | 2015-03-25 | 西安科技大学 | Protection structure for coal mine gob floor monitoring lines and buried method thereof |
| JP2018044362A (en) * | 2016-09-14 | 2018-03-22 | ケイコン株式会社 | Method for easily constructing tunnel watchman passage using l-shaped precast concrete product |
| CN109137998A (en) * | 2018-10-18 | 2019-01-04 | 中铁隧道股份有限公司 | Cross the existing electric power piping lane protection structure and its construction method of tunnel foundation pit |
| CN109713613A (en) * | 2018-12-20 | 2019-05-03 | 中国华冶科工集团有限公司 | Rail roadway cable laying method and device |
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