CN112682078B - Mining anti-impact active roof-contacting retractable pillar structure, supporting system and construction method - Google Patents
Mining anti-impact active roof-contacting retractable pillar structure, supporting system and construction method Download PDFInfo
- Publication number
- CN112682078B CN112682078B CN202011636317.6A CN202011636317A CN112682078B CN 112682078 B CN112682078 B CN 112682078B CN 202011636317 A CN202011636317 A CN 202011636317A CN 112682078 B CN112682078 B CN 112682078B
- Authority
- CN
- China
- Prior art keywords
- column
- yielding
- section column
- lower section
- steel plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention relates to a mining anti-impact active roof-contacted retractable pillar structure, which comprises a lower section pillar, an upper section pillar and a yielding device, wherein the lower section pillar is fixedly connected with the upper section pillar; the upper section column is arranged on the lower section column in a sliding manner; the upper section column is provided with a cavity, and the yielding device is vertically arranged in the cavity; the yielding device consists of a plurality of steel plates and yielding small columns, and has two important functions of jacking and contractibility; the yielding device is vertically provided with the yielding small columns, the initial supporting force and the yielding capacity of the yielding small columns are different when the diameters and the number of the yielding small columns are different, and the yielding small columns can be steel pipes, steel bars or other compressible materials; the top of the pressure yielding device is contacted with the top cover of the upper section column; the bottom of the yielding small column is in contact with a freely moving steel plate in the column body, the freely moving steel plate is lifted through grouting to enable the yielding small column to move upwards, the yielding device is driven to achieve top connection of the support column, and when the pressure of the top plate is too high, the yielding device is lowered through deformation, compression and lowering of the yielding small column to achieve that the yielding device lowers and drive the support column to be retractable; the lower section column, the upper section column and the yielding device jointly form a retractable supporting column structure which is supported between the roadway roof and the bottom plate. The pier column structure has the advantages of simple structure, high bearing capacity, capability of keeping the pier column bearing capacity not reduced, rapid constant-resistance contraction, impact energy absorption and capability of protecting the safety of personnel and equipment in a roadway space.
Description
Technical Field
The invention belongs to the field of coal mine roadway anti-impact support, and particularly relates to a mining anti-impact active roof-contacting retractable pillar structure, a support system and a construction method.
Background
Rock burst is a phenomenon that an empty rock body is suddenly destroyed in a deep mining process, when the rock burst occurs, a large amount of impact energy is released in the rock body, the occurrence frequency and the destruction degree of the rock burst are increasingly strong along with the continuous increase of the depth and the strength of coal mining, and the rock burst is one of the main potential safety hazards faced by deep mines at present. In an actual roadway, the safety of the roadway is usually ensured through a high-strength support form, for example, an anchor rod (anchor cable) support, a U-shaped steel support, a body fluid pressure pier stud support and the like are designed according to quasi-static mine pressure, and the capability of bearing static load is relatively strong, but under the action of impact load, the high impact effect of energy carried by sudden rock burst on a support system cannot be borne, the sudden damage of a part of support bodies often causes the impact instability damage of the whole support system, while the advanced hydraulic support has relatively high protection capability, and has a certain abdicating capability by adopting a hydraulic pier stud, but the self weight is large, the abdicating speed is low, the capability of absorbing impact energy is not available, and the hydraulic support is often subjected to severe bending deformation and even is damaged.
Compared with the prior patent CN106285738A, constant-group pressure transformation is realized by releasing the emulsion, but when the pressure is pressed by rock burst, the pressure is difficult to release in time, and the release time of the emulsion is far longer than the acting time of the rock burst, so that the impact energy cannot be absorbed. Compare CN107905825A, realize letting press through the log, the log mechanical properties is changeable on the one hand, and not compressed deformation when unable assurance pier stud normal use, on the other hand when proruption load appears, the log is in three-dimensional atress state under the restraint of cylinder shell, along with compressed, the bearing capacity improves, but the contractible space is little. Therefore, a supporting form which has simple structure, large bearing load, quick response and high energy absorption efficiency is provided.
Disclosure of Invention
In order to solve the problems, the invention provides a mining anti-impact active roof-contacted retractable pillar structure, a supporting system and a construction method, wherein the anti-impact pillar is used as a main bearing structure, has a simple structure and large bearing capacity, and can provide higher working resistance (4000-10000N/pillar) during normal use; when rock burst occurs, the bearing capacity of the support can be kept not to be reduced, and the support can be quickly contracted in a constant resistance manner, so that impact energy is absorbed, and the safety of personnel and equipment in a roadway space is protected.
The purpose of the invention is realized as follows:
a mining scour protection initiative meets and carries contractible type pillar structure, including lower sectional column, upper sectional column and letting the pressure equipment; the upper section column is arranged on the lower section column in a sliding manner; the upper section column is provided with the pressure yielding device, the pressure yielding device is vertically provided with pressure yielding small columns: the top of the pressure yielding device is in contact with the top cover of the upper section column, and the bottom of the steel pipe is in contact with the top of the lower section column; the lower section column, the upper section column and the yielding device are combined to form a retractable supporting column structure which is supported between the top and the bottom plate of the roadway.
The upper and lower section columns can be matched with each other in a sliding mode to provide a certain yielding space, the resistance effect of the yielding device can play a role of preliminary bracing, only when rock burst occurs, the yielding device can be quickly contracted, effective bracing is provided, yielding in the space is realized, and the completeness of a roadway and the safety of personnel are guaranteed.
In a preferred embodiment of the present invention, a bending-resistant steel bar or a bending-resistant steel bar penetrates through the lower column.
The bending-resistant steel bars or bending-resistant steel bars resist the horizontal thrust of the goaf caving gangue.
In a preferred embodiment of the invention, the upper and lower supporting columns are of steel tube structures, and slurry is poured into the steel tubes of the lower section column; the upper section column is sleeved on the outer wall of the lower section column.
The steel pipe has the advantages of inertia moment, uneasy distortion, high supporting force, capability of meeting the supporting requirement by filling slurry inside, and controllable cost. In addition, FRP pipes can also be used.
In a preferred embodiment of the invention, a slidable first circular steel plate is arranged in the upper section column steel pipe, and the first circular steel plate is fixedly arranged at the top of the yielding small column; a second slidable round steel plate is arranged in the steel pipe of the lower section column; the second round steel plate is fixedly arranged at the bottom of the yielding small column.
Through slidable steel sheet, the inside steel sheet that can jack that fills the thick liquid of section post down, thereby the jacking lets the pressure equipment put and drives section post support on the roof under the effect of steel sheet.
The invention also comprises a second round steel plate arranged in the cavity of the upper section column; the second round steel plate is arranged on the yielding small column in a penetrating mode and is located between the first round steel plate and the third round steel plate.
The position of the third round steel plate can be adjusted between the first round steel plate and the second round steel plate, so that the supporting resistance is changed to a certain degree.
In a preferred embodiment of the present invention, a first sealing ring is disposed between the third circular steel plate and the inner wall of the steel pipe of the lower column, and the first sealing ring is fixed on the outer periphery of the third circular steel plate; a second sealing ring is arranged between the steel pipe of the upper section column and the steel pipe of the lower section column; and the second sealing ring is fixed on the inner wall of the bottom of the steel pipe of the upper section column.
Sufficient jacking pressure can be guaranteed through the arrangement of the sealing ring, slurry leakage is prevented, meanwhile, after the lower section column is filled with slurry, the top connection is not carried out or the top connection pressure is not enough, the slurry can be continuously injected, the slurry enters the upper section column, a first sealing ring is arranged between the third circular steel plate and the inner wall of the steel pipe of the upper section column, and a second sealing ring is arranged between the steel pipe of the upper section column and the steel pipe of the lower section column; the slurry can be sealed in the second space and the jacking or holding pressure against the top can be continued.
In a preferred embodiment of the invention, the top cover, the first round steel plate and the third round steel plate are provided with exhaust holes;
or the middle of the pressure yielding device is provided with an exhaust pipe in a through mode, the upper end of the exhaust pipe penetrates through the top cover, and the lower end of the exhaust pipe penetrates through the third round steel pipe and is communicated with the interior of the steel pipe of the lower section column.
The exhaust hole is used for exhausting gas in the pillar cavity during grouting, and grouting is guaranteed to be more sufficient. The exhaust hole can be of a steel pipe structure.
In a preferred embodiment of the invention, the bottom end of the lower section column is fixed on the shoe plate, and a plurality of column claws are fixed on the top of the top cover and the top of the shoe plate.
The upper section of the column is provided with a top cover which is in contact with the roadway, the top cover increases the friction with the roadway through column claws, and the capability of the support column for bearing lateral pressure is increased. The bottom of the lower section column is welded with a shoe plate, four column claws are arranged on the shoe plate, and the friction with the ground is increased through the shoe plate.
The invention also relates to a mining anti-impact active roof-contacting retractable supporting system which comprises a plurality of groups of retractable supporting column structures supported along a roadway.
The invention also relates to a construction method of the mining anti-impact active roof-contacted retractable supporting structure, which is characterized by comprising the following steps:
1) Processing and manufacturing a support body hollow steel pipe support column body, a yielding small column, a circular steel plate, a top cover and a shoe plate on the ground, processing the top cover and an exhaust hole on an upper section column, processing a grouting hole and the shoe plate on a lower section column, assembling the yielding small column and the first, second and third circular steel plates to form a yielding device, welding the second circular steel plate to the top end of the lower section column, and sleeving the upper section column into the lower section column;
2) After the support is assembled, the support is transported to the interior of a roadway, a preset field of the support is leveled, a support position is determined according to design, the support is generally placed by a side wall, and the support is installed by using a special installing machine or a manual (2-3 persons);
3) Fixing a pillar, connecting the pillar with the anchor rods of the side wall, connecting at least two anchor rods to form an upper fixing measure and a lower fixing measure, and considering steel belt connection between the pillars when the distance between the upright columns is not more than 3 m;
4) Putting the dry materials into a pulping barrel, and adding water, an early strength agent, a water reducing agent, GFRP fibers and the like into the mixing of the pulp according to a certain proportion to enable the prepared pulp to reach preset strength;
5) Connect the slip casting pipeline, do in proper order: the method comprises the following steps that (1) a small-sized slurry pump, a conveying pipe, a check valve and a grouting hole are arranged, the check valve is opened, when the slurry pump is used for the first time, a tank of cement mortar is pumped to lubricate a pipeline, and then normal grouting is carried out;
6) During formal pouring, vibration measurement is carried out on the outer side of the strut by using a vibrator every 50cm to ensure the compactness of slurry, after the slurry is flush with the top of the lower section column, the upper section column is gradually lifted under the jacking pressure of the slurry at the lower part until the strut reaches the preset jacking pressure, the slurry pump is stopped, the check valve is closed, then the pipeline is disassembled, the grouting hole is blocked, the next empty strut is connected, and pouring is continued until all the preset empty struts are poured;
7) After grouting is finished, plumpness inspection is carried out the next day, knocking is adopted for preliminary inspection, careful detection is carried out on shock-proof pillars with different knocking sounds through ultrasonic waves, pillars with incompact slurry are found through inspection, a small-sized pump is adopted to inject high-consistency slurry with lower water-cement ratio through an exhaust hole for slurry supplement, or new pillars are erected again;
8) When in normal use, the internal high-strength slurry is combined with the strut shell to form a high-strength support body; when rock burst comes, huge pressure exceeds the rated bearing value of the strut, the yielding small column in the upper section column is compressed and deformed, the strut realizes transverse resistance deformation, and stability of a roadway is guaranteed.
The invention has at least the following beneficial effects:
1) The upper and lower section columns can be matched with each other in a sliding mode to provide a certain yielding space, the resistance effect of the yielding device can play a role of preliminary bracing, only when rock burst occurs, the yielding device can be quickly contracted, effective bracing is provided, yielding in the space is realized, and the completeness of a roadway and the safety of personnel are guaranteed.
2) The bending-resistant steel bars or bending-resistant steel bars resist the horizontal thrust of the goaf caving gangue.
3) The steel pipe has the advantages of inertia moment, uneasy distortion, high supporting force, capability of meeting the supporting requirement by filling slurry inside, and controllable cost.
4) Through slidable steel sheet, the inside steel sheet that can jack that fills the thick liquid of section post down, thereby the jacking lets the pressure equipment put and drives section post support on the roof under the effect of steel sheet.
5) The position of the third round steel plate can be adjusted between the first round steel plate and the second round steel plate, so that the supporting resistance is changed to a certain degree.
6) Sufficient jacking pressure can be ensured through the arrangement of the sealing ring, slurry leakage is prevented, meanwhile, after the lower section column is filled with slurry, the top connection is not carried out or the top connection pressure is not enough, the slurry can be continuously injected, the slurry enters the upper section column, a first sealing ring is arranged between the third circular steel plate and the inner wall of the steel pipe of the lower section column, and a second sealing ring is arranged between the steel pipe of the upper section column and the steel pipe of the lower section column; the slurry can be sealed in the second space and the jacking or holding pressure against the top can be continued.
7) The exhaust hole is used for exhausting gas in the pillar cavity during grouting, and grouting is guaranteed to be more sufficient. The exhaust hole can be of a steel pipe structure.
8) The upper section of the column is provided with a top cover which is in contact with the roadway, the top cover increases the friction with the roadway through column claws, and the capability of the support column for bearing lateral pressure is increased. The bottom of the lower section column is welded and connected with a shoe plate, four column claws are arranged on the shoe plate, and the friction between the shoe plate and the ground is increased.
9) When no impact load acts, the slurry is in a three-way compression state under the restraint of the column shell, so that the bearing capacity is increased, the stability of the pipe wall is increased under the restraint of the slurry in the column shell, and the bearing capacity and the stability of the support are greatly improved due to the 'symbiosis' of the slurry and the column body;
10 The small yielding columns are arranged in the upper cavity, the mechanical properties of the small yielding columns are fixed, the impact load resistance capacities of different supporting columns can be provided by adjusting the diameters and the number of the small yielding columns, and the small yielding columns can be steel pipes, steel bars or other compressible materials.
11 The lower cavity can also be filled with water, emulsified oil of the mining hydraulic prop or other materials, and the cost is saved on the premise of ensuring the bearing capacity.
12 The construction process can quickly finish the installation work of the support column, the support column has high bearing capacity and strong shock resistance, and the safety of personnel and equipment in a roadway can be effectively protected.
Drawings
FIG. 1 is a schematic view of a support structure in an un-jacked state according to the present invention;
FIG. 2 is a schematic view of a support structure in a raised state according to the present invention;
FIG. 3 is a schematic view of a steady state structure of a strut according to the present invention;
FIG. 4 is a schematic view of a post structure for rapid yielding according to the present invention;
FIG. 5 is a schematic view of the construction structure of the present invention.
In the figure, 1-top cover; 2-a first circular steel plate; 3-a second circular steel plate; 4-yielding small columns; 5-a third circular steel plate; 6-upper section column; 7-grouting holes; 8-shoe board; 9-vent hole; 10-a first sealing ring; 11-a second sealing ring; 12-lower section column; 13-slurry; 14-crush yielding device; 15-a top plate; 16-non-perfused struts; 17-a delivery pipe; 18-a poured strut; 19-small size slurry pump; 20-pulping barrel; 21-a check valve; 22-vibrator.
Detailed Description
The invention will be further explained with reference to the drawings.
Example one
Fig. 1-5 show schematic views of one embodiment of the food processing assembly of the present invention;
a mining scour protection initiative roof-contacted retractable pillar structure comprises a lower section column 12, an upper section column 6 and a yielding small column 4; the upper section column 6 is arranged on the lower section column 12 in a sliding manner; the upper section column 6 is provided with a cavity, the small yielding column 4 is vertically arranged in the cavity, the top of the small yielding column 4 is in contact with the top cover of the upper section column 6, and the bottom of the small yielding column is in contact with the top of the lower section column 12; the lower section column 12, the upper section column 6 and the yielding small column 4 jointly form a retractable supporting column structure which is supported between the roadway roof and the bottom plate.
The upper and lower section columns can be matched with each other in a sliding mode to provide a certain yielding space, the resistance effect of the yielding device can play a role of preliminary bracing, only when rock burst occurs, the yielding device can be quickly contracted, effective bracing is provided, yielding in the space is realized, and the completeness of a roadway and the safety of personnel are guaranteed.
Specifically, a bending-resistant steel bar or a bending-resistant steel bar (not shown) is inserted into the lower column 12.
The bending-resistant steel bars or bending-resistant steel bars resist the horizontal thrust of the goaf caving gangue.
Specifically, the upper and lower support columns are of steel tube structures, and slurry 13 is poured into the steel tubes of the lower section column; the upper section column 6 is sleeved on the outer wall of the lower section column 12.
The steel pipe has the advantages of inertia moment, uneasy distortion, high supporting force, capability of meeting the supporting requirement by filling slurry inside, and controllable cost. In addition, FRP pipes can also be used.
Specifically, a first slidable circular steel plate 2 is arranged in the steel pipe of the upper section column 6, and the first circular steel plate 2 is fixedly arranged at the top of the yielding small column 4; a slidable third circular steel plate 3 is arranged in the steel pipe of the lower sectional column 12; the second round steel plate 3 is fixedly arranged at the bottom of the yielding small column 4.
Through slidable steel sheet, the inside steel sheet that can jack that fills the thick liquid of section post down, thereby the jacking lets the pressure equipment put and drives section post support on the roof under the effect of steel sheet.
Specifically, the steel plate comprises a second round steel plate 3 arranged in a cavity of an upper section column 6; the second round steel plate 3 penetrates through the yielding small column 4 and is located between the first round steel plate 2 and the third round steel plate 5.
The third round steel plate 5 allows the position to be adjusted between the first round steel plate 2 and the second round steel plate 3, so that the bracing resistance can be changed to some extent.
Specifically, a first sealing ring 10 is arranged between the third circular steel plate 5 and the inner wall of the steel pipe of the lower section column, and the first sealing ring 10 is fixed on the periphery of the third circular steel plate 5; a second sealing ring 11 is arranged between the steel pipe of the upper sectional column 6 and the steel pipe of the lower sectional column 12; and the second sealing ring 11 is fixed on the inner wall of the bottom of the steel pipe of the upper section column 6.
Sufficient jacking pressure can be ensured through the arrangement of the sealing ring, slurry leakage is prevented, meanwhile, the top connection is not carried out or the top connection pressure is not enough after the lower section column is filled, the slurry can be continuously injected, the slurry enters the upper section column, a first sealing ring is arranged between the third circular steel plate and the inner wall of the steel pipe of the lower section column, and a second sealing ring is arranged between the steel pipe of the upper section column and the steel pipe of the lower section column; the slurry can be sealed in the second space and the jacking or holding pressure against the top can be continued.
Specifically, the top cover 1, the first circular steel plate 2 and the third circular steel plate 5 are provided with exhaust holes 9;
or, the middle of the yielding small column 4 is provided with an exhaust pipe in a through mode, the upper end of the exhaust pipe penetrates through the top cover 1, and the lower end of the exhaust pipe penetrates through the third round steel pipe 5 and is communicated with the inside of the steel pipe of the lower section column 12.
The exhaust hole is used for exhausting gas in the pillar cavity during grouting, and grouting is guaranteed to be more sufficient. The exhaust hole can be of a steel pipe structure.
In a preferred embodiment of the present invention, the bottom end of the lower stud is fixed on the shoe plate 8, and a plurality of studs are fixed on the top of the top cover 1 and the shoe plate 8.
The upper section of the column is provided with a top cover which is in contact with the roadway, the top cover increases the friction with the roadway through column claws, and the capability of the support column for bearing lateral pressure is increased. The bottom of the lower section column is welded with a shoe plate, four column claws are arranged on the shoe plate, and the friction with the ground is increased through the shoe plate.
In short, the mining anti-impact active roof-contacted strut structure provided by the invention mainly comprises two aspects: overall and detail construction of the strut.
1. Integral structure of pillar
The pillar mainly includes upper and lower two section posts and lets the pressure structure, lets the pressure structure welding in lower section post top, and upper segment post cover is in lower section post and lets pressure system top, makes up into whole through the sealing washer, and the pillar main part adopts steel pipe or FRP pipe preparation, according to the form that transmits power in the tunnel, and the cross-section both can be equal moment of inertia, should not distort circular and can be more suitable for bearing the rectangle of moment of bending of unequal.
The upper section of column comprises a top cover and an exhaust hole, the pressure yielding structure comprises an exhaust hole, a pressure yielding small column, a first circular steel plate, a second circular steel plate, a third circular steel plate and a first sealing ring, and the lower section of column comprises a first sealing ring, a grouting hole and a shoe plate. The upper section column and the lower section column respectively contain a cavity, slurry is injected into the lower cavity body to lift the pillars, the slurry is solidified and then is combined with the pillar bodies to form a high-strength supporting body, a yielding structure is placed in the upper cavity body, and when the working pressure exceeds the rated pressure, the yielding small columns of the yielding structure are stressed and compressed to deform, and the pillars realize transverse resistance deformation.
2. Details of the pillar
Let and press the first circular steel sheet size of structure slightly to be less than last section post internal diameter, the circular steel sheet of second be the ring shape, and the external diameter size is between last section post internal diameter and lower section post external diameter, and the internal diameter size is greater than lets presses little post size, and there is first sealing washer the third circular steel sheet outside, can with lower section post in close contact with. When the device is installed, the first circular steel plate is welded and one end of the small yielding column is made to penetrate into the second circular steel plate, the third circular steel plate is welded with the other end of the small yielding column, and the second circular steel plate is located between the first circular steel plate and the third circular steel plate.
In addition, the first round steel plate and the top cover of the upper section column are not processed, and only have the force transmission function. The small hole is reserved in the center of the top cover of the upper section column, the center of the first circular steel plate and the center of the third circular steel plate, and when the supporting column structure is assembled, the exhaust holes of the upper section column can be formed together after the assembly is completed. The welding of upper segment post top has top cap and tunnel contact, and the top cap passes through the friction of post claw increase and tunnel, increases the pillar and bears the ability of lateral pressure.
The bottom of the lower section column is welded with a shoe plate, four column claws are arranged on the shoe plate, and the friction with the ground is increased through the shoe plate; the middle part is provided with a grouting hole for grouting; and a second sealing ring is fixed on the outer side of the top of the lower section column, so that the sealing performance of the lower cavity during grouting is ensured.
During the use, adopt the jacking method, through the inside high strength slurry that fills of slip casting hole to empty pillar, every notes 50cm, carry out the vibration measurement with the vibrating rod in the pillar outside to guarantee the closely knit degree of slurry, after slurry and lower section post top parallel and level, the upper segment post is raised gradually under the jacking pressure of lower part slurry, stops the slip casting until the pillar reaches and stops the slip casting after predetermined top pressure that connects, shutoff slip casting hole, slip casting in-process, intracavity gas is from top exhaust hole discharge.
Example two:
the invention also relates to a mining anti-impact active roof-contacting retractable supporting system which comprises a plurality of groups of retractable supporting column structures in the first embodiment of roadway supporting.
Example three:
the invention also relates to a construction method of the mining anti-impact active roof-contacted retractable supporting structure, which comprises the following steps:
1) Processing and manufacturing a support body hollow steel pipe support column body, a yielding small column, a circular steel plate, a top cover and a shoe plate on the ground, processing the top cover and an exhaust hole on an upper section column, processing a grouting hole and the shoe plate on a lower section column, assembling the yielding small column and the first, second and third circular steel plates to form a yielding structure, welding the second circular steel plate to the top end of the lower section column, and sleeving the upper section column into the lower section column;
2) After the support is assembled, the support is transported to the interior of a roadway, a preset field of the support is leveled, a support position is determined according to design, the support is generally placed by a side wall, and the support is installed by using a special installing machine or a manual (2-3 persons);
3) Fixing the pillar, connecting the pillar with the anchor rods of the side wall, connecting at least two anchor rods to form two fixing measures up and down, and considering steel belt connection between the pillars when the distance between the upright columns is not more than 3 m;
4) Putting the dry materials into a pulping barrel, and adding water, an early strength agent, a water reducing agent, GFRP fibers and the like into the mixing of the pulp according to a certain proportion to enable the prepared pulp to reach preset strength;
5) Connect the slip casting pipeline, do in proper order: the method comprises the following steps that (1) a small-sized slurry pump, a conveying pipe, a check valve and a grouting hole are arranged, the check valve is opened, when the slurry pump is used for the first time, a tank of cement mortar is pumped to lubricate a pipeline, and then normal grouting is carried out;
6) During formal pouring, vibration measurement is carried out on the outer side of the strut by using a vibrator every 50cm to ensure the compactness of slurry, after the slurry is flush with the top of the lower section column, the upper section column is gradually lifted under the jacking pressure of the slurry at the lower part until the strut reaches the preset jacking pressure, the slurry pump is stopped, the check valve is closed, then the pipeline is disassembled, the grouting hole is blocked, the next empty strut is connected, and pouring is continued until all the preset empty struts are poured;
7) Checking the fullness in the next day after grouting, performing preliminary checking by knocking, performing careful detection on impact-proof pillars with different knocking sounds by ultrasonic waves, checking pillars with incompact slurry, and injecting high-consistency slurry with a low water-cement ratio through an exhaust hole by using a small pump to supplement the slurry or re-erecting a new pillar;
8) When in normal use, the internal high-strength slurry is combined with the strut shell to form a high-strength support body; when rock burst comes, huge pressure exceeds the rated bearing value of the strut, the yielding small column in the upper section column is compressed and deformed, the strut realizes transverse resistance deformation, and stability of a roadway is guaranteed.
The technical key points of the invention are as follows:
1. the invention provides a mining anti-impact active roof-contacted pillar structure which mainly comprises an upper pillar body, a lower pillar body and a pressure yielding structure, wherein the upper pillar body comprises a top cover, anti-bending round steel and an exhaust hole, the pressure yielding structure comprises an exhaust hole, a pressure yielding small pillar, a first round steel plate, a second round steel plate, a third round steel plate and a first sealing ring, and the lower pillar body comprises a second sealing ring, a grouting hole, anti-bending round steel and a shoe plate.
2. A pressure relief device is arranged in the upper cavity and fixed at the top end of the lower section column, and the upper section column is sleeved outside the lower section column; the lower section column grips the ground through the shoe plate, the middle part is provided with the grouting hole, when in use, the grouting liquid is injected from the grouting hole of the lower section column, and the jacking upper section column is connected with the roof under pressure.
3. The anti-bending round steel is welded in the lower section column of the pillar, the round steel is outward in side direction, and the horizontal thrust of gangue falling in a goaf is resisted.
4. The pillar body provided by the invention can be made of steel pipes or GFRP pipes, and the cross section can be circular with equal moment of inertia and uneasy to twist or rectangular with unequal bending moment according to the form of force transmitted from a roadway.
5. The pouring system provided by the invention completes the pouring of 20-30 struts each time, and mainly comprises a pulping barrel, a small-sized grouting pump, a conveying pipe and a check valve. Specifically, the method comprises the following steps: stirring the slurry by the slurry making barrel; the small grouting pump is connected with the grouting hole through a conveying pipe and used for pumping slurry; the check valve can realize the unidirectional flow of the slurry; the delivery pipe serves as a medium for slurry transport.
6. The construction method provided by the invention specifically comprises the following steps of (1) manufacturing and assembling a strut structure on the ground; (2) primarily treating a support area, and erecting a strut; (3) a fixed pillar, which is connected with the anchor rod of the side wall; (4) preparing slurry; (5) connecting a grouting pipeline; (6) grouting into the strut to make the upper section of the strut connected with the top under pressure; (7) after grouting, checking the fullness, and supplementing unqualified grout; (8) during normal use, provide high bearing capacity, the rock burst comes temporarily, lets and presses the pillar by compression deformation, guarantees that the tunnel is stable.
While the foregoing is directed to the preferred embodiment of the present invention, the scope of the present invention is not limited thereto, and it will be appreciated by those skilled in the art that changes and modifications may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents, and that such changes and modifications are to be considered as within the scope of the invention.
Claims (6)
1. A mining anti-impact active roof-contacted retractable pillar structure is characterized by comprising a lower section pillar, an upper section pillar and a pressure yielding device; the upper section column is arranged on the lower section column in a sliding manner; the upper section column is provided with a pressure yielding device, and a small pressure yielding column is vertically arranged in the pressure yielding device; the top of the small yielding column is in contact with the top cover of the upper section column, and the bottom of the small yielding column is in contact with the top of the lower section column; the lower section column, the upper section column and the yielding device are combined to form a retractable pillar structure which is supported between the roadway top and the bottom plate;
the inner part of the lower section column is provided with a bending-resistant steel bar or a bending-resistant steel bar in a penetrating way;
the upper section column and the lower section column are both of steel tube structures, and slurry is poured into the steel tube of the lower section column; the upper section column is sleeved on the outer wall of the lower section column;
a first slidable circular steel plate is arranged in the steel pipe of the upper section column, and the first circular steel plate is fixedly arranged at the top of the yielding device; a third slidable round steel plate is arranged in the steel pipe of the lower section column; the third circular steel plate is fixedly arranged at the bottom of the yielding device;
the second round steel plate is arranged in the upper section column cavity; the second circular steel plate is arranged on the yielding device in a penetrating mode and is located between the first circular steel plate and the third circular steel plate.
2. The mining anti-impact active roof-contacted retractable pillar structure according to claim 1, wherein a first sealing ring is arranged between the third circular steel plate and the inner wall of the steel pipe of the lower section column, and the first sealing ring is fixed on the periphery of the third circular steel plate; a second sealing ring is arranged between the steel pipe of the upper section column and the steel pipe of the lower section column; and the second sealing ring is fixed on the inner wall of the bottom of the steel pipe of the upper section column.
3. The mining impact-prevention active roof-contacted retractable pillar structure of claim 2, wherein the top cover, the first circular steel plate and the third circular steel plate are provided with vent holes; or the middle of the pressure yielding device is provided with an exhaust pipe in a through mode, the upper end of the exhaust pipe penetrates through the top cover, and the lower end of the exhaust pipe penetrates through the third round steel pipe and is communicated with the interior of the steel pipe of the lower section column.
4. The mining erosion-resistant active roof-contacting retractable pillar structure of claim 2, wherein the bottom end of said lower stud is fixed to the shoe plate, and a plurality of stud claws are fixed to the top of said top cover and shoe plate.
5. An anti-impact active roof-contacting retractable support system for mines, which is characterized by comprising a plurality of groups of retractable support column structures according to any one of claims 1 to 4 supported along a roadway.
6. A construction method of a mining anti-impact active roof-contacted retractable pillar structure, which is used in the supporting system of claim 5, is characterized by comprising the following steps:
1) Processing and manufacturing a support body hollow steel pipe support column body, a yielding small column, a circular steel plate, a top cover and a shoe plate on the ground, processing the top cover and an exhaust hole on an upper section column, processing a grouting hole and the shoe plate on a lower section column, assembling the yielding small column, the first circular steel plate, the second circular steel plate and the third circular steel plate to form a yielding device, welding the second circular steel plate to the top end of the lower section column, and sleeving the upper section column into the lower section column;
2) Transporting the assembled support to the interior of a roadway, leveling a preset site of the support, determining a supporting position according to design, placing the support generally against a side wall, and using a special mounting machine or manual mounting;
3) Fixing a pillar, connecting the pillar with the anchor rods of the side wall, connecting at least two anchor rods to form an upper fixing measure and a lower fixing measure, and connecting steel belts between the pillars when the distance between the upright columns is not more than 3 m;
4) Putting the dry materials into a pulping barrel, and adding water, an early strength agent, a water reducing agent and GFRP fibers into the mixing of the pulp according to a certain proportion to enable the prepared pulp to reach a preset strength;
5) Connect the slip casting pipeline, do in proper order: the method comprises the following steps that (1) a small-sized slurry pump, a conveying pipe, a check valve and a grouting hole are arranged, the check valve is opened, when the slurry pump is used for the first time, a tank of cement mortar is pumped to lubricate a pipeline, and then normal grouting is carried out;
6) During formal pouring, vibration measurement is carried out on the outer side of the strut by using a vibrator every 50cm to ensure the compactness of slurry, after the slurry is flush with the top of the lower section column, the upper section column is gradually lifted under the jacking pressure of the slurry at the lower part until the strut reaches the preset jacking pressure, the slurry pump is stopped, the check valve is closed, then the pipeline is disassembled, the grouting hole is blocked, the next empty strut is connected, and pouring is continued until all the preset empty struts are poured;
7) Checking the fullness in the next day after grouting, performing preliminary checking by knocking, performing careful detection on impact-proof pillars with different knocking sounds by ultrasonic waves, checking pillars with incompact slurry, and injecting high-consistency slurry with a low water-cement ratio through an exhaust hole by using a small pump to supplement the slurry or re-erecting a new pillar;
8) When in normal use, the internal high-strength slurry is combined with the strut column shell to form a high-strength support body; when rock burst comes, huge pressure exceeds the rated bearing value of the strut, yielding small columns in the upper section of columns are compressed and deformed, the strut achieves transverse resistance deformation, and stability of a roadway is guaranteed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011636317.6A CN112682078B (en) | 2020-12-31 | 2020-12-31 | Mining anti-impact active roof-contacting retractable pillar structure, supporting system and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011636317.6A CN112682078B (en) | 2020-12-31 | 2020-12-31 | Mining anti-impact active roof-contacting retractable pillar structure, supporting system and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112682078A CN112682078A (en) | 2021-04-20 |
| CN112682078B true CN112682078B (en) | 2023-04-18 |
Family
ID=75456447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011636317.6A Active CN112682078B (en) | 2020-12-31 | 2020-12-31 | Mining anti-impact active roof-contacting retractable pillar structure, supporting system and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112682078B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482707B (en) * | 2021-07-19 | 2024-04-26 | 乔轻炳 | Impact-resistant supporting coal conveyor for fully mechanized mining face |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2163872Y (en) * | 1993-08-04 | 1994-05-04 | 龚义 | Steel-wood joined prop for ultra-unstable coal beds |
| US6394707B1 (en) * | 1997-05-08 | 2002-05-28 | Jack Kennedy Metal Products & Buildings, Inc. | Yieldable mine roof support |
| US6499916B2 (en) * | 1999-04-14 | 2002-12-31 | American Commercial Inc. | Compressible support column |
| CN106285738B (en) * | 2016-09-28 | 2018-10-16 | 山东科技大学 | A kind of " steel reinforced concrete-hydraulic pressure " roadside support device and method for protecting support for deep tunnel |
| CN206647117U (en) * | 2017-03-16 | 2017-11-17 | 山东科技大学 | A kind of surge combination formula hydraulic prop cap |
-
2020
- 2020-12-31 CN CN202011636317.6A patent/CN112682078B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112682078A (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112682077B (en) | Mining anti-impact three-column parallel type active roof-connecting retractable pier column structure, supporting system and construction method | |
| CN112832830B (en) | Mining anti-impact double-column combined pier column structure, supporting system and construction method | |
| CN105673039A (en) | Gob-side entryretaining roadway-side flexible and high-strength material bearing construction structure and construction method thereof | |
| US11248464B2 (en) | Method of treating tunnel collapse with roof-contacted shield support | |
| CN110424380B (en) | Accurate guiding construction method for cast-in-situ bored pile | |
| CN112682078B (en) | Mining anti-impact active roof-contacting retractable pillar structure, supporting system and construction method | |
| CN106368219B (en) | A kind of the support reinforcement structure and construction method of deep basal pit | |
| ES2669430T3 (en) | Soil densification system and method | |
| CN110966026A (en) | High-water-filling support roadside supporting method | |
| CN113027503A (en) | Movable device for filling non-Newtonian fluid to resist impact force and construction method | |
| CN114232611B (en) | Filling device and filling method for karst cave in pile hole | |
| CN107060876A (en) | Concrete filled steel tube pier stud gob side entry retaining active support structure and its construction method | |
| CN209585054U (en) | Be used for foundation ditch to speedily carry out rescue work emergent bracing fast | |
| CN215053063U (en) | Foundation pit supporting structure | |
| CN214247362U (en) | Mining scour protection initiative top-contacting spherical energy-absorbing pillar structure and supporting system | |
| CN214533011U (en) | Mining scour protection initiative is met a and is pressed log energy-absorbing strut structure and supporting system | |
| CN209384256U (en) | A kind of bracing means of offshore wind farm steel-pipe pile | |
| CN212054727U (en) | Pavilion type shield plate support | |
| JP2014211051A (en) | Underground structure, and method for reconstructing building structure having underground skeleton | |
| CN220955647U (en) | Roadside support grouting steel pipe pier for coal mine | |
| CN213329138U (en) | Loading device and test equipment for foundation pile pulling-resistant static load test | |
| CN111364531B (en) | Meet in-cylinder and out-cylinder net pulp load box | |
| CN116163337A (en) | Prefabricated piping lane with toughen prevention of seepage function | |
| CN216922142U (en) | Highway tunnel preliminary bracing punishment of collapsing strengthens device | |
| CN212641534U (en) | Load box using self-service in-cylinder grouting jack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |