CN113217047B - Yielding high-strength concrete skeleton roadside support - Google Patents
Yielding high-strength concrete skeleton roadside support Download PDFInfo
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- CN113217047B CN113217047B CN202110513624.3A CN202110513624A CN113217047B CN 113217047 B CN113217047 B CN 113217047B CN 202110513624 A CN202110513624 A CN 202110513624A CN 113217047 B CN113217047 B CN 113217047B
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 115
- 239000010959 steel Substances 0.000 claims abstract description 115
- 238000013016 damping Methods 0.000 claims abstract description 80
- 239000004567 concrete Substances 0.000 claims abstract description 77
- 239000002184 metal Substances 0.000 claims abstract description 53
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 238000005065 mining Methods 0.000 claims abstract description 48
- 230000006835 compression Effects 0.000 claims abstract description 30
- 238000007906 compression Methods 0.000 claims abstract description 30
- 239000011435 rock Substances 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 239000004816 latex Substances 0.000 claims description 3
- 229920000126 latex Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003044 adaptive effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- 239000003245 coal Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/02—Non-telescopic props
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/58—Devices for setting props or chocks
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Abstract
The invention discloses a yielding high-strength concrete skeleton roadside support body which comprises a combined positioning compression-resistant structure, a steel pipe concrete skeleton structure and a yielding limiting device, wherein the combined positioning compression-resistant structure comprises a steel pipe concrete skeleton structure and a yielding limiting device; according to the mining steel pipe, concrete is poured into the mining steel pipe, the metal framework is additionally arranged in the concrete, a steel pipe-steel bar framework-concrete integral bearing steel pipe-concrete framework structure is formed, the bearing capacity of the mining steel pipe is improved, and the lateral pressure resistance of the mining steel pipe is enhanced; the yielding damping sheet of the yielding limiting device can realize flexible yielding bearing, and meanwhile, the limiting support controls the settlement of the top plate, so that a flexible-strong combined support is formed with a steel pipe concrete framework structure, and the effects of strong early-stage deformation capability and high later-stage support resistance are realized; the combined positioning compression-resistant structure increases the contact area of the bottom plate of the steel pipe concrete skeleton structure, limits the sliding of the steel pipe concrete skeleton structure, improves the stress state of the steel pipe concrete skeleton structure, and solves the problem that the traditional roadside support body has mechanical properties such as support resistance, retractility and the like and is not adaptive to the deformation of gob-side entry retaining surrounding rocks.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a yielding high-strength concrete skeleton roadside support body.
Background
With the implementation of the sustainable development strategy of coal mining in China, gob-side entry retaining is continuously popularized and applied as an effective coal pillar-free mining technology. The technology has the outstanding advantages of improving the recovery rate of coal resources, reducing the excavation amount of a roadway, realizing Y-shaped ventilation of a working face, solving the problem of gas accumulation at corners of the working face and the like.
The key to the success of gob-side entry retaining is the stability of the roadside support. The roadside support body bears the weight of the top rock beam in the violent motion state, is required to adapt to the early violent sedimentation motion of the basic top rock beam and bear the later acting force of the top plate, achieves the combination of yielding and controlled sedimentation, has the synergistic effect of the roadside support goaf waste rock and the solid coal and ensures the integral stability of the roadway surrounding rock support bearing system.
The main methods of roadway-side support at present comprise 3 methods of small coal pillars, roadway-side filling and pillars, and the 3 methods have own advantages and disadvantages. For example, patent CN110284905A discloses a gob-side entry retaining roadside support structure and a support method thereof, including a plurality of support bodies arranged at intervals near the sidewall of a goaf in a roadway, the support bodies being non-top cylindrical steel pipes; the outer wall of the support body is provided with a filling port; the supporting body is internally provided with a filling material; the supporting bodies are arranged in a straight line along the side wall of the goaf. Patent CN109209485A discloses a filling mining trapezoidal roadside support body and a support method. The problems with the above technique are as follows: the roadside support has mechanical properties such as support resistance, retractility and the like which are not suitable for gob-side entry retaining surrounding rock deformation and complex entry retaining process. Considering how to achieve good yielding performance of roadside support, high resistance increasing speed and high initial supporting force, the method realizes strong early-stage deformability and high later-stage support resistance, achieves 'soft-strong' combined support, is convenient for field construction, is economical and practical, and is a difficult problem in the process of gob-side entry retaining.
Disclosure of Invention
The invention aims to solve the technical problem of how to solve the problem that the traditional roadside support has mechanical properties such as support resistance, retractility and the like which are not suitable for gob-side entry retaining surrounding rock deformation.
The invention solves the technical problems through the following technical means:
a yielding high-strength concrete skeleton roadside support comprises a combined positioning compression-resistant structure, a steel pipe concrete skeleton structure and a yielding limiting device;
the combined positioning compression-resistant structure comprises a compression-resistant beam and a positioning groove; the positioning groove is fixed at the top of the compression beam;
the steel pipe concrete skeleton structure comprises a mining steel pipe, a metal skeleton and a connecting fixer; the mining steel pipe is fixed in the positioning groove; the metal framework is arranged in the mining steel pipe in the middle, and is fixedly connected with the interior of the mining steel pipe through the connecting fixator; concrete is poured into the metal framework and between the metal framework and the interior of the mining steel pipe;
the yielding limiting device comprises a connecting plate, and the connecting plate is horizontally or obliquely arranged according to the condition of the roadway roof; connecting plate bottom fixedly connected with a plurality of vertical settings and parallel with working face advancing direction let press the damping fin, a plurality of let press damping fin bottom with mining steel pipe top fixed connection, and a plurality of let the height of pressing the damping fin follow the incline direction of connecting plate is the same or different.
The combined positioning compression-resistant structure, the steel pipe concrete skeleton structure and the yielding limiting device are combined, wherein concrete is poured into the steel pipe for the mine, and the metal skeleton is additionally arranged in the concrete, so that the steel pipe concrete skeleton structure integrally bearing the steel pipe, the steel reinforcement skeleton and the concrete is formed, the bearing capacity of the steel pipe concrete skeleton structure is improved, and the lateral pressure resistance of the steel pipe concrete skeleton structure is enhanced; by utilizing the yielding damping sheet of the yielding limiting device, flexible yielding bearing can be realized, meanwhile, the limiting support controls the settlement of the top plate, and the limiting support and the steel pipe concrete skeleton structure form a 'flexible-strong' combined support, so that the effects of strong early-stage deformation capability and high later-stage support resistance are realized; and then the contact area of the bottom plate of the steel pipe concrete skeleton structure is increased by utilizing the combined positioning compression-resistant structure, the sliding of the steel pipe concrete skeleton structure is limited, and the stress state of the steel pipe concrete skeleton structure is improved. The problem of traditional roadside supporter exist and strut mechanical properties such as resistance, yieldability and gob entry surrounding rock deformation not suit is solved.
Preferably, three positioning grooves are arranged at equal intervals; three groups of steel pipe concrete framework structures and three groups of yielding limiting devices are correspondingly arranged; the three form the combination support body, promote the whole bearing strength of support body.
Preferably, the combined positioning and pressure resisting structure further comprises an anti-overflow gasket, and the anti-overflow gasket is arranged between the mining steel pipe and the positioning groove.
Preferably, the material of the anti-overflow gasket is a leakproof latex gasket.
Preferably, the metal framework comprises a plurality of metal framework longitudinal ribs and a plurality of metal framework transverse ribs; the plurality of metal framework longitudinal ribs are arranged in an annular shape at equal intervals; and the plurality of metal framework transverse ribs are internally connected or externally connected with the metal framework longitudinal ribs and are circumferentially and uniformly arranged.
Preferably, two groups of connecting and fixing devices are arranged, one group of connecting and fixing devices is used for connecting the mining steel pipe and the upper end of the metal framework, and the other group of connecting and fixing devices is used for connecting the mining steel pipe and the lower end of the metal framework;
the connecting fixer comprises three connecting pieces, the three connecting pieces are arranged in an annular shape at equal intervals, one end of each connecting piece is fixedly connected with the metal framework, and the other end of each connecting piece is fixedly connected with the inner wall of the mining steel pipe.
Preferably, the number of the yielding damping fins is four, two of the yielding damping fins are respectively fixed at the front and rear positions of the bottom of the connecting plate, and the other two yielding damping fins are respectively fixed at the left and right positions of the bottom of the connecting plate; and the bottoms of the yielding damping fins are all flat sections and are all on the same horizontal plane.
Preferably, when the connecting plate level set up, four let press the damping fin top to be the plain section, and four let press the height of damping fin the same.
Preferably, when the connecting plate is the tilt state, four let press the damping fin top to be the oblique cross-section, and four let press the height of damping fin to follow the incline direction of connecting plate changes, four let press the damping fin height to obtain through country rock roof structure deformation mechanism analysis and numerical simulation.
Preferably, the steel pipe concrete skeleton texture still includes the ring flange, the ring flange sets up mining steel pipe with let and press between the stop device, just the ring flange bottom with mining steel pipe top fixed connection, the ring flange top with let and press damping fin bottom fixed connection.
The invention has the advantages that:
1. the combined positioning compression-resistant structure, the steel pipe concrete skeleton structure and the yielding limiting device are combined, wherein concrete is poured into the steel pipe for the mine, and the metal skeleton is additionally arranged in the concrete to form the steel pipe concrete skeleton structure integrally bearing the steel pipe, the steel reinforcement skeleton and the concrete, so that the bearing capacity of the steel pipe concrete skeleton structure is improved, and the lateral pressure resistance of the steel pipe concrete skeleton structure is enhanced; the yielding damping sheet of the yielding limiting device can realize flexible yielding bearing, and meanwhile, the limiting support controls the settlement of the top plate, so that a flexible-strong combined support is formed with a steel pipe concrete framework structure, and the effects of strong early-stage deformation capability and high later-stage support resistance are realized; and then the contact area of the bottom plate of the steel pipe concrete skeleton structure is increased by utilizing the combined positioning compression-resistant structure, the sliding of the steel pipe concrete skeleton structure is limited, and the stress state of the steel pipe concrete skeleton structure is improved. The problem of traditional roadside supporter have mechanical properties such as supporting resistance, yieldability and the rock deformation is not adapted to gob-side entry retaining is solved.
2. According to the invention, the three positioning grooves are arranged on the compression beam at equal intervals, each positioning groove supports one group of steel pipe concrete framework structures and pressure yielding limiting devices, and the three positioning grooves form a combined support body, so that the integral bearing strength of the support body is improved.
3. The pressure yielding limiting device has deformation and pressure stabilization performance, can adapt to pressure caused by basic top rotation sinking, and avoids damage and instability of a roadside support body caused by stress concentration acting on the roadside support body; the combined positioning compression-resistant structure and the steel pipe concrete framework structure provide enough support resistance, have high strength and strong early-stage deformation capability, are suitable for violent movement of the top plate, and can maintain the stable structure of the cantilever beam after deformation of the overlying strata in the later stage.
4. The connecting plates are horizontally or obliquely arranged according to the condition of the roadway roof, and the heights of the four yielding damping pieces are obtained through structural deformation mechanism analysis and numerical simulation of the surrounding rock roof, so that the method is better suitable for migration of roof strata, and 'given deformation' in an early-stage constant-resistance state is realized.
Drawings
FIG. 1 is a schematic structural view of a yielding high-strength concrete skeleton roadside support body of the invention;
FIG. 2 is a schematic structural view of a steel pipe concrete skeleton structure according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a metal skeleton according to an embodiment of the present invention;
FIG. 4 is an enlarged structural view of the embodiment A of the present invention;
fig. 5 is a schematic structural view of the pressure-yielding limiting device according to the embodiment of the invention.
The reference numbers illustrate:
1. combining and positioning the compression-resistant structure; 11. a compression beam; 12. positioning a groove; 13. an anti-overflow gasket; 2. a steel pipe concrete skeleton structure; 21. mining steel pipes; 22. a metal skeleton; 221. longitudinal bars of the metal framework; 222. a metal framework transverse bar; 23. connecting a fixer; 24. a flange plate; 3. a pressure relief limiting device; 31. a connecting plate; 32. let and press the damping fin.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, the embodiment discloses a yielding high-strength concrete skeleton roadside support body, which comprises a combined positioning compression-resistant structure 1, a steel pipe concrete skeleton structure 2 and a yielding limiting device 3.
As shown in fig. 1, and specifically with reference to the orientation of fig. 1, the combined positioning and pressure-resisting structure 1 includes a pressure-resisting beam 11, three positioning grooves 12 and three spill-preventing gaskets 13; the compression beam 11 of the present embodiment is machined from steel of the prior art; the three positioning grooves 12 are fixed at the top of the compression beam 11 at equal intervals, the interval between two adjacent positioning grooves 12 in the embodiment is 600mm, the positioning grooves 12 are formed by cutting steel pipes in the prior art, the bottoms of the positioning grooves 12 are fixed at the top of the compression beam 11 in a welding manner, and in other embodiments, the bottoms of the positioning grooves 12 can also be fixed at the top of the compression beam 11 in a bolt or screw connection manner; an anti-overflow gasket 13 is placed at the top end inside each positioning groove 12, the anti-overflow gasket 13 of the embodiment is of a circular ring structure, and the anti-overflow gasket 13 is made of an anti-leakage latex gasket in the prior art.
As shown in fig. 1-4, and with reference to the orientation of fig. 1 in particular, the steel tube concrete skeleton structure 2 is composed of a mining steel tube 21, a metal skeleton 22, a connecting fixer 23, concrete and a flange 24; the mining steel pipe 21 is sleeved in the positioning groove 12, the bottom of the mining steel pipe 21 is pressed on the anti-overflow gasket 13, and the anti-overflow gasket 13 is matched with the inner diameter of the positioning groove 12, so that the contact area of the bottom plate of the steel pipe concrete skeleton structure 2 is increased, and the steel pipe concrete skeleton structure 2 is limited from sliding;
as shown in fig. 2, the metal framework 22 is centrally disposed inside the mining steel pipe 21, and as shown in fig. 3, the metal framework 22 includes a plurality of metal framework longitudinal ribs 221 and a plurality of metal framework transverse ribs 222; the metal framework longitudinal ribs 221 are made of round steel in the prior art, and the plurality of metal framework longitudinal ribs 221 are arranged in an annular shape at equal intervals; the metal framework transverse ribs 222 are made of plain round steel in the prior art, a plurality of metal framework transverse ribs 222 are internally connected or externally connected with the metal framework longitudinal ribs 221 and are circumferentially and uniformly arranged, and the intersection points of the metal framework longitudinal ribs 221 and the metal framework transverse ribs 222 are bound by iron wires;
as shown in fig. 1, 2 and 4, the metal framework 22 of the present embodiment is connected to the mining steel pipe 21 by using a connecting fixer 23, the connecting fixer 23 is formed by processing round steel in the prior art, two groups of connecting fixers 23 are provided in the present embodiment, one group of connecting fixer 23 is used for connecting the mining steel pipe 21 and the upper end of the metal framework 22, and the other group of connecting fixer 23 is used for connecting the mining steel pipe 21 and the lower end of the metal framework 22; the connecting and fixing device 23 comprises three connecting pieces which are arranged in an annular shape at equal intervals, one ends of the three connecting pieces are fixedly welded with the metal framework 22, and the other ends of the three connecting pieces are fixedly welded with the inner wall of the mining steel pipe 21;
concrete is poured into the metal framework 22 and between the metal framework 22 and the interior of the mining steel pipe 21, the concrete is prepared from ordinary portland cement, and is directly pumped into the mining steel pipe 21 by a concrete pump after being stirred underground to form a steel pipe-steel bar framework-concrete integrally-bearing steel pipe concrete framework structure 2, so that the concrete can be changed from a unidirectional stress state to a three-way stress state, and the bearing strength of the concrete is improved;
the flange 24 is welded on the top of the mining steel pipe 21, or can be integrally formed with the top of the mining steel pipe 21, and in other embodiments, the flange 24 can be mounted on the top of the mining steel pipe 21 by bolts or screws.
As shown in fig. 1 and 5, and specifically referring to the orientation of fig. 1, the yielding limiting device 3 includes a connecting plate 31, the connecting plate 31 is a square steel plate structure in the prior art, and the connecting plate 31 of this embodiment is horizontally or obliquely arranged according to the condition of the roadway roof; the bottom of the connecting plate 31 is welded with a plurality of yielding damping fins 32 which are vertically arranged and are parallel to the propelling direction of the working face, the bottoms of the plurality of yielding damping fins 32 are welded and fixed with the top of the flange plate 24, and the heights of the plurality of yielding damping fins 32 are the same or different along the inclined direction of the connecting plate 31;
as shown in fig. 1 and 5, four yielding damping fins 32 are provided, and the heights of the four yielding damping fins change along with the inclination state of the connecting plate 31; two of the yielding damping fins 32 are respectively welded at the front and rear positions of the bottom of the connecting plate 31, and the other two yielding damping fins 32 are respectively welded at the left and right positions of the bottom of the connecting plate 31; the bottoms of the four yielding damping fins 32 are all flat sections and are all on the same horizontal plane.
The working principle of the embodiment is as follows: the invention provides a yielding high-strength concrete skeleton roadside support body, which is characterized in that before use, a metal skeleton 22 is connected with a mining steel pipe 21 by a connecting fixer 23, then the height of four yielding damping sheets 32 is obtained by adopting roof surrounding rock structure deformation mechanism analysis and numerical simulation according to whether the roof condition of a roadway is horizontal or inclined, the four yielding damping sheets 32 are respectively welded at the top of a flange plate 24 according to corresponding positions, the four yielding damping sheets 32 are ensured to be parallel to the advancing direction of a working face, finally a connecting plate 31 is correspondingly welded at the tops of the four yielding damping sheets 32, and meanwhile, three positioning grooves 12 are welded at the top of a compression-resistant beam 11 at equal intervals; during the use, put into the constant head tank 12 with anti-overflow gasket 13 earlier, then with the steel pipe concrete skeleton texture 2 assembled with let press stop device 3 insert in the constant head tank 12, keep connecting plate 31 and tunnel roof to meet the top, rethread lets press damping fin 32 clearance pour into C40 concrete, the working face distance is no longer than 10m after the concrete pouring lags behind, after the concrete solidification, can realize steel pipe concrete skeleton texture 2 and let and press stop device 3's final assembly.
Compared with the prior art, the invention has the following advantages: firstly, the combined positioning compression-resistant structure 1, the steel pipe concrete skeleton structure 2 and the yielding limiting device 3 are combined, wherein concrete is poured into a mining steel pipe 21, a metal skeleton 22 is additionally arranged in the concrete, so that the steel pipe concrete skeleton structure 2 integrally bearing the steel pipe-steel bar skeleton-concrete is formed, the bearing capacity of the steel pipe concrete skeleton structure is improved, and the lateral pressure resistance of the steel pipe concrete skeleton structure is enhanced; the yielding damping fins 32 of the yielding limiting device 3 are utilized to realize flexible yielding bearing, meanwhile, the limiting support controls the settlement of the top plate, and the top plate and the steel pipe concrete skeleton structure 2 form a 'flexible-strong' combined support, so that the effects of strong early-stage deformability and high later-stage support resistance are realized; and then the contact area of the bottom plate of the steel pipe concrete skeleton structure 2 is increased by utilizing the combined positioning compression-resistant structure 1, the sliding of the steel pipe concrete skeleton structure 2 is limited, and the stress state of the steel pipe concrete skeleton structure 2 is improved. The problem that the traditional roadside support body has mechanical properties such as support resistance and retractility and is not adaptive to gob-side entry retaining surrounding rock deformation is solved; secondly, three positioning grooves 12 are arranged on the compression-resistant beam 11 at equal intervals, each positioning groove 12 supports a group of steel pipe concrete skeleton structures 2 and a yielding limiting device 3, and three positioning grooves form a combined support body to improve the integral bearing strength of the support body; thirdly, the yielding limiting device 3 has deformation and pressure stabilization performance, can adapt to pressure caused by basic top rotation sinking, and avoids damage and instability of a roadside support body caused by stress concentration acting on the roadside support body; the combined positioning compression-resistant structure 1 and the steel pipe concrete skeleton structure 2 provide enough support resistance, have high strength and strong early-stage deformability, are suitable for violent movement of a top plate, and can maintain the stability of the cantilever beam structure after the overlying strata deforms in the later stage; fourthly, the connecting plates 31 are horizontally or obliquely arranged according to the condition of the roadway roof, and the heights of the four yielding damping pieces 32 are obtained through structural deformation mechanism analysis and numerical simulation of the surrounding rock roof, so that the method is better suitable for the migration of the roof rock stratum, and the given deformation in the early stage constant resistance state is realized.
Example two
The present embodiment differs from the above embodiments in that: the connecting plate 31 of this embodiment is the tilt state according to the tunnel roof condition, and four let press the damping fin 32 highly different, and four let press the damping fin 32 highly to obtain through surrounding rock roof structure deformation mechanism analysis and numerical simulation, and the particular case is as follows:
when the connecting plate 31 is in an inclined state with a low front part and a high rear part, the tops of the four yielding damping fins 32 are all inclined sections with a low front part and a high rear part, and the heights of the yielding damping fin 32 at the front end, the two yielding damping fins 32 at the left and right sides and the yielding damping fin 32 at the rear end are sequentially increased;
when the connecting plate 31 is in an inclined state with a high front part and a low rear part, the tops of the four yielding damping fins 32 are all inclined sections with high front parts and low rear parts, and the heights of the yielding damping fin 32 positioned at the front end, the two yielding damping fins 32 positioned at the left and right and the yielding damping fin 32 positioned at the rear end are sequentially decreased;
when the connecting plate 31 is in an inclined state with the left high and the right low, the tops of the four yielding damping fins 32 are all inclined sections with the left high and the right low, the heights of the yielding damping fins 32 positioned at the front end and the rear end are the same, and the height of the yielding damping fin 32 positioned at the left end is higher than that of the yielding damping fin 32 positioned at the right end;
when the connecting plate 31 is in an inclined state with a low left and a high right, the top of each of the four yielding damping fins 32 is an inclined cross section with a low left and a high right, the yielding damping fins 32 at the front end and the rear end have the same height, and the height of the yielding damping fin 32 at the left end is lower than that of the yielding damping fin 32 at the right end.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a let pressure concrete skeleton roadside supporter that excels in which characterized in that: comprises a combined positioning compression-resistant structure, a steel pipe concrete skeleton structure and a yielding limiting device;
the combined positioning compression-resistant structure comprises a compression-resistant beam and a positioning groove; the positioning groove is fixed at the top of the compression-resistant beam; the number of the positioning grooves is three, and the three positioning grooves are arranged at equal intervals; three groups of steel pipe concrete framework structures and pressure relief limiting devices are correspondingly arranged;
the steel pipe concrete skeleton structure comprises a mining steel pipe, a metal skeleton and a connecting fixer; the mining steel pipe is fixed in the positioning groove; the metal framework is arranged in the mining steel pipe in the middle, and is fixedly connected with the interior of the mining steel pipe through the connecting fixator; concrete is poured into the metal framework and between the metal framework and the interior of the mining steel pipe; the metal framework comprises a plurality of metal framework longitudinal ribs and a plurality of metal framework transverse ribs; the plurality of metal framework longitudinal bars are arranged in an annular shape at equal intervals; a plurality of metal framework transverse ribs are internally connected with or externally connected with the metal framework longitudinal ribs and are circumferentially and uniformly arranged;
the yielding limiting device comprises a connecting plate, and the connecting plate is horizontally or obliquely arranged according to the condition of the roadway top plate; the bottom of the connecting plate is fixedly connected with a plurality of pressure yielding damping fins which are vertically arranged and parallel to the propelling direction of a working face, the bottoms of the pressure yielding damping fins are fixedly connected with the top of the mining steel pipe, and the heights of the pressure yielding damping fins are the same or different along the inclination direction of the connecting plate; four pressure yielding damping fins are arranged, wherein two pressure yielding damping fins are respectively fixed at the front and rear positions of the bottom of the connecting plate, and the other two pressure yielding damping fins are respectively fixed at the left and right positions of the bottom of the connecting plate; the bottoms of the four yielding damping fins are all flat sections and are all on the same horizontal plane; when the connecting plate is horizontally arranged, the tops of the four yielding damping pieces are flat sections, and the heights of the four yielding damping pieces are the same; when the connecting plate is the tilt state, four let press the damping fin top to be the oblique cross-section, and four let press the height of damping fin to follow the incline direction of connecting plate changes, four let press the damping fin height to obtain through country rock roof structure deformation mechanism analysis and numerical simulation.
2. The yielding high-strength concrete skeleton roadside support body as claimed in claim 1, wherein: the combined positioning compression-resistant structure further comprises an anti-overflow gasket, and the anti-overflow gasket is arranged between the mining steel pipe and the positioning groove.
3. The yielding high-strength concrete skeleton roadside support body as claimed in claim 2, wherein: the material of the anti-overflow gasket is an anti-leakage latex gasket.
4. The yielding high-strength concrete skeleton roadside support body as claimed in claim 1, characterized in that: the connecting and fixing devices are arranged in two groups, one group of connecting and fixing devices are used for connecting the mining steel pipe and the upper end of the metal framework, and the other group of connecting and fixing devices are used for connecting the mining steel pipe and the lower end of the metal framework;
the connecting and fixing device comprises three connecting pieces, the three connecting pieces are arranged in an annular and equidistant mode, one ends of the three connecting pieces are fixedly connected with the metal framework, and the other ends of the three connecting pieces are fixedly connected with the inner wall of the mining steel pipe.
5. The yielding high-strength concrete skeleton roadside support body as claimed in claim 1, wherein: the steel pipe concrete skeleton texture still includes the ring flange, the ring flange sets up mining steel pipe with let and press between the stop device, just the ring flange bottom with mining steel pipe top fixed connection, the ring flange top with let and press damping fin bottom fixed connection.
6. The yielding high-strength concrete skeleton roadside support body as claimed in claim 1, characterized in that: when the connecting plate is in an inclined state with a low front part and a high rear part, the tops of the four yielding damping fins are inclined sections with a low front part and a high rear part, and the heights of the yielding damping fin positioned at the front end, the two yielding damping fins positioned at the left and the right and the yielding damping fin positioned at the rear end are sequentially increased;
when the connecting plate is in an inclined state with a high front part and a low back part, the tops of the four yielding damping pieces are all inclined sections with high front parts and low back parts, and the heights of the yielding damping piece positioned at the front end, the two yielding damping pieces positioned at the left and the right and the yielding damping piece positioned at the back end are sequentially decreased;
when the connecting plate is in an inclined state with the left high and the right low, the tops of the four yielding damping fins are all inclined sections with the left high and the right low, the heights of the yielding damping fins positioned at the front end and the rear end are the same, and the height of the yielding damping fin positioned at the left end is higher than that of the yielding damping fin positioned at the right end;
when the connecting plate is the high inclined state in the low right side in a left side, four let press the damping fin top to be the high oblique cross-section in the low right side in a left side, and be located both ends around just let press the highly the same of damping fin, be located the left end let press the highly being less than of damping fin be located the right-hand member let press the height of damping fin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110513624.3A CN113217047B (en) | 2021-05-11 | 2021-05-11 | Yielding high-strength concrete skeleton roadside support |
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| CN103291319B (en) * | 2013-05-20 | 2015-06-24 | 山东科技大学 | Rigid-flexible combination gob-side entry retaining method and rigid-flexible combination gob-side entry retaining device by aid of roadside supports |
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