CN111022087B - Post-frame yielding method and device for U-shaped steel support - Google Patents
Post-frame yielding method and device for U-shaped steel support Download PDFInfo
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- CN111022087B CN111022087B CN201911311252.5A CN201911311252A CN111022087B CN 111022087 B CN111022087 B CN 111022087B CN 201911311252 A CN201911311252 A CN 201911311252A CN 111022087 B CN111022087 B CN 111022087B
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- yielding
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/22—Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
Abstract
The invention discloses a post-frame yielding method of a U-shaped steel bracket, which is characterized by comprising the following steps: 1. acquiring initial yielding load capacity and initial shrinkage of the U-shaped steel support, and acquiring top plate load capacity and surrounding rock deformation during secondary pressure; 2. the designed yielding device is a yielding strip made of hard rubber materials and consists of a secondary yielding belt and a primary pressure-equalizing yielding belt; fixing the yielding device and the U-shaped steel bracket on the surrounding rock of the roadway; 4. along with the increase of tunnel country rock deflection, play once the pressure-equalizing and let and press and the secondary lets the pressure effect to whole reduction tunnel support cost.
Description
Technical Field
The invention relates to a mine supporting technology.
Background
The U-shaped steel bracket is a passive supporting object for supporting a coal mine, has high tensile strength and compressive strength, good toughness, high supporting force and high supporting strength, can be used repeatedly, and is widely applied to U-shaped section roadways of mines, particularly deep complex roadways and soft coal seam roadways. The U-shaped steel support is formed by processing section steel with a U-shaped section, the arched part and the upright part are processed into a plurality of sections of components, and the components are fixed into a whole through clamping cables after being lapped. The retractility of the U-shaped steel bracket is realized by means of relative sliding of two U-shaped steel sections of the overlapping section, and the friction force of the relative sliding is realized by a clamping cable. The best stress state of the U-shaped steel support is that the wall is filled with the surrounding rock after being compacted to be uniformly stressed, when the pressure value of the surrounding rock on the U-shaped steel support reaches a certain value, the support can be compressed to reduce the pressure of the surrounding rock acting on the U-shaped steel support, and therefore the situation that the pressure of the surrounding rock is greater than the bearing capacity of the U-shaped steel support to damage the support is avoided.
Due to the influence of cable clamping performance, the existing U-shaped steel support has small contractibility, and the fracture surface of the roadway is already destabilized and damaged when being reduced by 20 percent, so that the contractible significance is lost. Especially, when the section of the roadway is irregular, the support is uneven in stress and larger in destructiveness. The wall thickness is filled and can realize that support and rock face are hugged closely, because the inhomogeneous of surrounding rock deformation, and then leads to the support atress uneven, produces great lateral pressure, also makes the support atress uneven and destroys easily. In order to compensate the flexibility of the support, a method of backing up a back plate behind the support and the like is generally adopted to compress the top plate in the back plate and improve the stress state and the overall stability of the support, but the problem cannot be solved in practical application.
Disclosure of Invention
In order to overcome the problems, the invention provides a post-frame yielding method of a U-shaped steel bracket and a device for the method.
The technical scheme is that the after-frame yielding method of the U-shaped steel support is characterized by comprising the following steps:
firstly, obtaining yielding parameters of the U-shaped steel bracket
Researching the surrounding rock deformation rule of the roadway of the mine or an adjacent mine which is supported by the U-shaped steel support, so as to obtain the initial yielding load capacity and the initial shrinkage of the U-shaped steel support, and obtain the roof load capacity and the surrounding rock deformation during secondary pressure;
second step, design yielding device
Designing a yielding device according to yielding parameters of the U-shaped steel support obtained in the first step; the yielding device is a yielding strip made of hard rubber materials and arranged between the U-shaped steel bracket and the arched top plate; the pressure yielding strip consists of an upper layer and a lower layer, the upper layer is a secondary pressure yielding belt, the lower layer is a primary pressure-equalizing pressure yielding belt, opposite surfaces of the upper layer and the lower layer are provided with a mutual embedded structure, and two sides of the mutual embedded structure are provided with corresponding bolt holes;
the cross section of the primary pressure equalizing press belt is in a T shape, and the cross section of the T-shaped vertical part is in an inverted isosceles trapezoid shape matched with the cross section of the U-shaped groove of the U-shaped steel bracket; the designed lower bottom width of the inverted isosceles trapezoid is larger than the middle width of the U-shaped groove of the U-shaped steel bracket, so that the lower bottom width can contract and deform when the design pressure is reached and can be extruded into the U-shaped groove; the design pressure is equal to the yielding initial load quantity of the U-shaped steel support obtained in the first step, and the vertical shrinkage deformation quantity under the load is equal to the initial deformation quantity obtained in the first step; therefore, the elastic modulus of the hard rubber material for manufacturing the primary pressure-equalizing pressure-releasing belt is required to meet the design requirements of the pressure-releasing initial load capacity and the initial deformation, and the design height of the primary pressure-equalizing pressure-releasing belt is required to meet the sum of the U-shaped groove section height of the U-shaped steel bracket and the initial deformation;
the design section of the secondary yielding belt is rectangular, the design width is equal to that of the primary pressure-equalizing yielding belt, and the design height meets the deformation of the secondary yielding belt; in order to meet the secondary yielding deformation, the elastic modulus of the hard rubber material for manufacturing the secondary yielding belt is required to meet the load capacity and the deformation of the top plate during the secondary pressure coming obtained in the first step;
when the hardness of the manufacturing material is high and the elastic modulus of the manufacturing material cannot meet the requirement, holes can be uniformly distributed in the secondary pressure-yielding belt body, and V-shaped holes are designed in the primary pressure-equalizing pressure-yielding belt body along the length direction;
thirdly, manufacturing, assembling and yielding process of yielding device
1. Manufacturing a primary pressure equalizing and yielding belt and a secondary pressure yielding belt of the yielding device according to the design of the second step;
2, pressing the primary pressure-equalizing yielding belt into a U-shaped groove of each section of assembly of the U-shaped steel bracket, then embedding and fixing the secondary yielding belt on the primary pressure-equalizing yielding belt, and fixing the secondary pressure-equalizing yielding belt and the primary pressure-equalizing yielding belt together by using bolts;
3. splicing all sections of components of the U-shaped steel support provided with the pressure relieving device in a roadway in a lap joint mode, fastening the components by using clamping cables, enabling the pressure relieving device to be supported in the roadway in a manner of being tightly attached to a rock surface as much as possible, and then installing an anchor rod to fix the U-shaped steel support on surrounding rocks of the roadway;
4. after the installation is finished, the primary pressure-equalizing yielding belt is extruded along with the increase of the deformation of surrounding rocks of the roadway, and when the extrusion force reaches a yielding initial load, the primary pressure-equalizing yielding belt is extruded and deformed and is pressed into a U-shaped groove of the U-shaped steel bracket, and because different parts of the bracket are subjected to different loads, the depths of pressing the yielding devices into the U-shaped groove are different, so that the primary pressure-equalizing and yielding effects are achieved;
along with the further increase of tunnel country rock deflection, the secondary lets the pressure area begin compression deformation, lets in addition the whole deformation of pressing the device, has played the secondary and has let the effect of pressing, has both solved the local destruction problem that leads to because of U shaped steel support atress inequality, has also replaced the contractible volume of having supplyed U shaped steel support, has improved the whole adaptability of support, reduces maintenance work volume to whole reduction tunnel struts cost.
Drawings
FIG. 1 is a schematic view of a primary pressure equalizing and yielding belt configuration of a yielding device;
FIG. 2 is a schematic view of a secondary pressure-yielding belt structure of the pressure-yielding device;
FIG. 3 is a schematic view of the overall state of the pressure relief device;
FIG. 4 is a cross section of the pressure-yielding device and a state that the pressure-yielding device is installed in a U-shaped groove of a U-shaped steel bracket;
FIG. 5 is a view showing the use state of the U-shaped steel bracket after the pressure-yielding device is mounted.
Illustrated in the drawings. 1-secondary pressure yielding, 2-primary pressure-equalizing pressure yielding, 3-bolt holes, 4-mutual mosaic structure, 5-V-shaped holes, 6-holes, 7-clamping cables, 8-U-shaped steel supports, 9-bolts and 10-roadway surrounding rock.
Detailed Description
The technical scheme of the invention is further explained by referring to the attached drawings.
A post-frame yielding method of a U-shaped steel support comprises the following steps:
firstly, obtaining yielding parameters of the U-shaped steel bracket
And (3) surveying the deformation rule of the surrounding rock of the roadway of the mine or an adjacent mine which is supported by the U-shaped steel support, so as to obtain the initial yielding load capacity and the initial shrinkage of the U-shaped steel support and obtain the roof load capacity and the surrounding rock deformation during secondary pressure.
Second step, design yielding device
Designing a yielding device according to yielding parameters of the U-shaped steel support obtained in the first step; the pressure yielding device is a pressure yielding strip made of hard rubber materials and arranged between the U-shaped steel bracket and the arched top plate, the pressure yielding strip is composed of an upper layer and a lower layer as shown in figure 3, the upper layer is a secondary pressure yielding strip 1 as shown in figure 2, the lower layer is a primary pressure-equalizing pressure yielding strip 2 as shown in figure 1, the opposite surfaces of the upper layer and the lower layer are provided with mutual embedded structures 4, and the two sides are provided with corresponding bolt holes 3;
the cross section of the primary pressure equalizing press belt 2 is in a T shape as shown in figure 1, and the cross section of a T-shaped vertical part is in an inverted isosceles trapezoid shape matched with the cross section of a U-shaped groove of the U-shaped steel bracket; the designed lower bottom width of the inverted isosceles trapezoid is larger than the middle width of the U-shaped groove of the U-shaped steel bracket, so that the lower bottom width can contract and deform when the design pressure is reached and can be extruded into the U-shaped groove; the design pressure is equal to the yielding initial load quantity of the U-shaped steel support obtained in the first step, and the vertical shrinkage deformation quantity under the load is equal to the initial deformation quantity obtained in the first step; therefore, the elastic modulus of the hard rubber material for manufacturing the primary pressure-equalizing pressure-releasing belt is required to meet the design requirements of the pressure-releasing initial load capacity and the initial deformation, and the design height of the primary pressure-equalizing pressure-releasing belt is required to meet the sum of the U-shaped groove section height of the U-shaped steel bracket and the initial deformation;
the design section of the secondary yielding belt shown in fig. 2 is rectangular, the design width is equal to that of the primary pressure-equalizing yielding belt, and the design height is designed to meet the deformation of the secondary yielding belt; in order to meet the secondary yielding deformation, the elastic modulus of the hard rubber material for manufacturing the secondary yielding belt is required to meet the load capacity and the deformation of the top plate during the secondary pressure coming obtained in the first step;
from the above figures, when the hardness of the manufacturing material is high and the elastic modulus of the manufacturing material cannot meet the requirement, the holes 6 which are uniformly arranged in the secondary yielding belt body can be formed, and the V-shaped holes 5 are designed in the primary pressure-equalizing yielding belt body along the length direction.
Thirdly, manufacturing, assembling and yielding process of yielding device
1. Manufacturing a primary pressure equalizing and yielding belt 2 and a secondary pressure yielding belt 1 of a yielding device according to the design of the second step;
2. pressing the primary pressure-equalizing yielding press belt 2 into a U-shaped groove of each section of assembly of the U-shaped steel bracket 8, then embedding the secondary pressure-equalizing yielding press belt 2 on the primary pressure-equalizing yielding press belt 2 through a mutual embedding structure 4, and fixing the two press belts together through bolt holes 3 by bolts 9, as shown in FIG. 4;
3. splicing and assembling all sections of components of the U-shaped steel support 8 provided with the pressure yielding device in a roadway in a lap joint manner, fastening the components by using a clamping cable 7, enabling the pressure yielding device to be tightly attached to the rock surface of the roadway surrounding rock 10 as much as possible and supporting the components in the roadway, and then driving an anchor rod 9 to fix the U-shaped steel support 8 on the roadway surrounding rock 10, as shown in fig. 5;
4. after the installation is finished, along with the increase of the deformation of the roadway surrounding rock 10, the primary pressure-equalizing yielding belt 2 is extruded, when the extrusion force reaches the yielding initial load, the primary pressure-equalizing yielding belt 2 is extruded and deformed and is pressed into the U-shaped groove of the U-shaped steel bracket 8, and because different parts of the bracket are subjected to different loads, the depths of pressing the yielding devices into the U-shaped groove are different, so that the primary pressure-equalizing and yielding effects are achieved;
along with the further increase of tunnel country rock 10 deflection, the secondary lets press the area 1 to begin compression deformation, lets in addition the whole deformation of pressing the device, has played the secondary and has let the effect of pressing, has both solved the local destruction problem that leads to because of U shaped steel support 8 atress is uneven, has also replaced the contractible volume of U shaped steel support 8, has improved the whole adaptability of support, reduces maintenance work volume to whole reduction tunnel struts the cost.
Claims (3)
1. A post-frame yielding method of a U-shaped steel support is characterized by comprising the following steps: firstly, obtaining yielding parameters of the U-shaped steel bracket
Researching the deformation rule of the surrounding rock of the roadway of the mine or an adjacent mine after the mine or the adjacent mine is supported by the U-shaped steel bracket, so as to obtain the initial yielding load capacity and the initial shrinkage of the U-shaped steel bracket, and obtain the roof load capacity and the surrounding rock deformation during secondary pressure;
second step, design yielding device
Designing a yielding device according to yielding parameters of the U-shaped steel support obtained in the first step; the pressure yielding device is a pressure yielding strip made of hard rubber materials and arranged between the U-shaped steel bracket and the arched top plate, the pressure yielding strip consists of an upper layer and a lower layer, the upper layer is a secondary pressure yielding belt, the lower layer is a primary pressure-equalizing pressure yielding belt, opposite surfaces of the upper layer and the lower layer are provided with mutual embedded structures, and two sides of the upper layer and the lower layer are provided with corresponding bolt holes;
the cross section of the primary pressure equalizing press belt is in a T shape, and the cross section of the T-shaped vertical part is in an inverted isosceles trapezoid shape; the designed lower bottom width of the inverted isosceles trapezoid is larger than the middle width of the U-shaped groove of the U-shaped steel bracket, so that the lower bottom width can contract and deform when the design pressure is reached and can be extruded into the U-shaped groove; the design pressure is equal to the initial yielding load quantity of the U-shaped steel bracket obtained in the first step, and the vertical shrinkage deformation under the initial yielding load quantity is equal to the initial shrinkage quantity obtained in the first step; therefore, the elastic modulus of the hard rubber material for manufacturing the primary pressure-equalizing pressure-releasing belt is required to meet the design requirements of the initial pressure-releasing load capacity and the initial shrinkage, and the design height of the primary pressure-equalizing pressure-releasing belt is required to meet the sum of the section height of the U-shaped groove of the U-shaped steel bracket and the initial shrinkage;
the design section of the secondary yielding belt is rectangular, the design width is equal to that of the primary pressure-equalizing yielding belt, and the design height meets the deformation of the secondary yielding belt; in order to meet the secondary yielding deformation, the elastic modulus of the hard rubber material for manufacturing the secondary yielding belt is required to meet the roof load and the surrounding rock deformation during the secondary pressure coming obtained in the first step;
when the hardness of the manufacturing material is high and the elastic modulus of the manufacturing material cannot meet the requirement, holes can be uniformly distributed in the secondary pressure belt body along the width direction, and V-shaped holes are designed in the primary pressure equalizing pressure belt body along the length direction;
thirdly, manufacturing, assembling and yielding process of yielding device
1. Manufacturing a primary pressure equalizing and yielding belt and a secondary pressure yielding belt of the yielding device according to the design of the second step;
2, pressing the primary pressure-equalizing yielding belt into a U-shaped groove of each section of assembly of the U-shaped steel bracket, then embedding and fixing the secondary yielding belt on the primary pressure-equalizing yielding belt, and fixing the secondary pressure-equalizing yielding belt and the primary pressure-equalizing yielding belt together by using bolts;
3. splicing all sections of components of the U-shaped steel support provided with the pressure relieving device in a roadway in a lap joint mode, fastening the components by using clamping cables, enabling the pressure relieving device to be supported in the roadway in a manner of being tightly attached to a rock surface as much as possible, and then installing an anchor rod to fix the U-shaped steel support on surrounding rocks of the roadway;
4. after the installation is finished, the primary pressure-equalizing yielding belt is extruded along with the increase of the deformation of surrounding rocks of the roadway, and when the extrusion force reaches a yielding initial load, the primary pressure-equalizing yielding belt is extruded and deformed and is pressed into a U-shaped groove of the U-shaped steel bracket, and because different parts of the bracket are subjected to different loads, the depths of pressing the yielding devices into the U-shaped groove are different, so that the primary pressure-equalizing and yielding effects are achieved; along with the further increase of tunnel country rock deflection, the secondary lets the pressure area begin compression deformation, carries out the secondary and lets the pressure, and the reducible volume of replacement U shaped steel support to improve the whole adaptability of support.
2. A racking device for use in the method of claim 1,
the pressure-yielding belt is a strip-shaped pressure-yielding belt made of hard rubber materials, the pressure-yielding belt consists of an upper layer and a lower layer, the upper layer is a secondary pressure-yielding belt, the lower layer is a primary pressure-equalizing pressure-yielding belt, opposite surfaces of the upper layer and the lower layer are provided with a mutual embedded structure, and two sides of the upper layer and the lower layer are provided with corresponding bolt holes; the cross section of the primary pressure equalizing press belt is in a T shape, and the cross section of the T-shaped vertical part is in an inverted isosceles trapezoid shape; the width of the lower bottom of the inverted isosceles trapezoid is larger than the width of the middle part of the U-shaped groove of the U-shaped steel bracket, and the inverted isosceles trapezoid can contract and deform and is extruded into the U-shaped groove when reaching the design pressure; the section shape of the secondary yielding belt is rectangular, the width of the secondary yielding belt is equal to that of the primary pressure-equalizing yielding belt, and the height of the secondary yielding belt is required to meet the deformation of the surrounding rock.
3. The after-frame pressure relief device according to claim 2, wherein the secondary pressure relief belt has holes uniformly arranged in a width direction, and the primary pressure relief belt has V-shaped holes in a length direction.
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| CN201911311252.5A CN111022087B (en) | 2019-12-18 | 2019-12-18 | Post-frame yielding method and device for U-shaped steel support |
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| CN201911311252.5A CN111022087B (en) | 2019-12-18 | 2019-12-18 | Post-frame yielding method and device for U-shaped steel support |
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| CN111022087B true CN111022087B (en) | 2021-03-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4457366A (en) * | 1982-09-29 | 1984-07-03 | Trevor F. Cuthill | Wiper device for stripping fluid from well pipe |
| CN106677797A (en) * | 2017-03-13 | 2017-05-17 | 安徽理工大学 | U-shaped steel composite support structure for deep dynamic pressure soft rock roadway and construction method of U-shaped steel composite support structure |
| RU2664996C1 (en) * | 2017-08-28 | 2018-08-24 | Глушков Антон Александрович | Method of installation and shaft lining device |
| CN208220823U (en) * | 2018-05-17 | 2018-12-11 | 湖南有色金属职业技术学院 | Suspension device is used in a kind of mining |
| CN208396724U (en) * | 2018-06-06 | 2019-01-18 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of mine laneway composite supporting construction |
-
2019
- 2019-12-18 CN CN201911311252.5A patent/CN111022087B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4457366A (en) * | 1982-09-29 | 1984-07-03 | Trevor F. Cuthill | Wiper device for stripping fluid from well pipe |
| CN106677797A (en) * | 2017-03-13 | 2017-05-17 | 安徽理工大学 | U-shaped steel composite support structure for deep dynamic pressure soft rock roadway and construction method of U-shaped steel composite support structure |
| RU2664996C1 (en) * | 2017-08-28 | 2018-08-24 | Глушков Антон Александрович | Method of installation and shaft lining device |
| CN208220823U (en) * | 2018-05-17 | 2018-12-11 | 湖南有色金属职业技术学院 | Suspension device is used in a kind of mining |
| CN208396724U (en) * | 2018-06-06 | 2019-01-18 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of mine laneway composite supporting construction |
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