CN113738409A - Active support type yielding bearing support column and use method thereof - Google Patents
Active support type yielding bearing support column and use method thereof Download PDFInfo
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- CN113738409A CN113738409A CN202111096688.4A CN202111096688A CN113738409A CN 113738409 A CN113738409 A CN 113738409A CN 202111096688 A CN202111096688 A CN 202111096688A CN 113738409 A CN113738409 A CN 113738409A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 189
- 239000010959 steel Substances 0.000 claims abstract description 189
- 239000011435 rock Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 8
- 210000001503 joint Anatomy 0.000 claims abstract description 6
- 230000000452 restraining effect Effects 0.000 claims abstract 3
- 239000011513 prestressed concrete Substances 0.000 claims 2
- 239000011150 reinforced concrete Substances 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 210000003462 vein Anatomy 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
- E21D15/14—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
- E21D15/50—Component parts or details of props
-
- 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
- E21D15/50—Component parts or details of props
- E21D15/54—Details of the ends of props
- E21D15/55—Details of the ends of props of prop heads or feet
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
An active supporting type yielding bearing support column and a using method thereof comprise a prestress applying device, an inner supporting steel pipe, an outer restraining steel pipe and a top-contacting steel plate, wherein the inner supporting steel pipe and the outer restraining steel pipe are arranged on a top plate of the prestress applying device; wherein, the external restraint steel pipe is formed by butt joint of two semicircular pipes, and the inner wall of the upper end of the external restraint steel pipe is provided with a cutting rubber pad. The using method comprises the steps of prefabricating the component; placing a prestress applying device on a bottom plate rock body at a supporting position; welding the inner support steel pipe on a top plate of the prestress applying device; fixedly connecting the external constraint steel pipe with a top plate of a prestress applying device; and injecting water into the prestress applying device to expand the expansion material, so that the expansion material is converted into active support between the top plate and the bottom plate. The strut can keep constant ultimate bearing capacity after the inner supporting steel pipe is greatly deformed, and long-term yielding support is realized; the inner support steel pipe and the outer constraint steel pipe bear the load together when the compression deformation of the inner support steel pipe is the same as the height of the outer constraint steel pipe, so that the bearing capacity is increased; the external constraint steel pipe can be recycled.
Description
Technical Field
The invention relates to metal mine underground support, in particular to an active support type yielding bearing support column and a using method thereof.
Background
When metal ores enter deep high-stress mining, the safety of personnel and equipment is seriously threatened by ground pressure disasters such as wall stripping of a stope, large-area collapse of a top plate and the like. Although the original rock pillar can improve the safety of a stope, the original rock pillar is easy to be subjected to brittle fracture under a single-shaft loading condition, and the original rock pillar is reserved to cause serious loss of ore resources. In order to improve the recovery rate of ore and ensure the stability of the prop, artificial ore pillars with low cost and excellent performance become the research subject of more and more scholars.
Most of the existing artificial ore pillars of different types have the defects of small active supporting force, low bearing strength, long erection period, complex construction process and the like, and particularly have the problems of difficult roof contact and passive bearing in most common concrete pillars.
In order to solve the above-mentioned disadvantages of the existing artificial ore pillar, the patent document CN109944615A discloses an artificial ore pillar for underground support. This artificial pillar is including connecing a steel sheet, support post and prestressing force applying device, and prestressing force applying device is the power supply in artificial pillar initiative support excavation space in the pit, and inside is filled with expanding material, meets the water after the chemical reaction can expand and produce the prestressing force more than 10 MPa. 5 ~ 7 support posts are evenly distributed between the roof-contacting steel plate and the prestress applying device, and are main bearing and supporting components of the artificial ore pillar. This artificial pillar has two drawbacks: firstly, the support upright posts are a plurality of independent hollow steel pipes or seamless pipes, belong to rigid support, and when the load bearing capacity is greater than the maximum bearing capacity of the support force column, the support upright posts are rapidly bent and unstable, and lose the function of providing long-term pressure yielding support for the underground excavation space (namely, the performance of keeping constant or larger support force after large deformation); secondly, all components of the artificial ore pillar are disposable and cannot be recycled, and the supporting cost is high.
Disclosure of Invention
In order to overcome the defects of the artificial ore pillar disclosed in the patent document CN109944615A, the invention provides an active support type yielding bearing support pillar and a use method thereof.
The active support type yielding bearing pillar provided by the invention comprises a prestress applying device (the internal structure of which is the same as that of an artificial ore pillar disclosed in the patent document CN 108625653A) arranged on a stope floor rock body; an inner support steel pipe and an outer constraint steel pipe are concentrically and vertically fixedly arranged at the center position of a top plate of the prestress applying device, a distance of 5-20 mm is kept between the outer wall of the inner support steel pipe and the inner wall of the outer constraint steel pipe, and the height of the outer constraint steel pipe is 20-60 mm smaller than that of the inner support steel pipe; the upper end of the inner support steel pipe is connected with a stope roof rock mass through a plug-in type roof connecting steel plate (a cylinder which can be plugged with the inner support steel pipe is welded on the bottom surface of the roof connecting steel plate).
In order to facilitate the recovery of the external restraint steel pipe after the mining of the original rock pillar, the external restraint steel pipe is formed by butting two semicircular steel pipes in the axial direction, and the joint is fastened by a connecting piece A and a bolt A which are respectively welded on the two semicircular steel pipes; the lower ends of the two semicircular steel pipes are fixedly connected with the top plate of the prestress applying device through a connecting piece B and a bolt B which are welded at the bottom ends of the two semicircular steel pipes.
In order to prevent the outer wall from being in strong contact with the inner wall of the upper end of the external constraint steel pipe to be damaged when the internal support steel pipe is pressed to axially displace, an anti-cutting rubber pad can be bonded on the inner wall of the upper end of the integral external constraint steel pipe; and semi-circular arc-shaped cutting-resistant rubber pads are respectively bonded on the inner walls of the upper ends of the two semi-circular steel pipes forming the split type external constraint steel pipe.
The use method of the active support type yielding bearing support column which is formed by integral steel pipes and aims at externally restricting the steel pipes comprises the following steps:
step 1: the prefabricated part: determining the types, wall thicknesses and lengths of the inner support steel pipe and the outer constraint steel pipe according to the compressive stress of surrounding rocks of the stope and the stope height; determining the yielding amount of the strut and the prestress of the prestress applying device according to the distribution condition of the ground stress, the stope span and the properties of the surrounding rock; welding a connecting piece B used for being connected with a top plate of the prestress applying device at the lower end of the external constraint steel pipe, and arranging a bolt hole used for installing a bolt B on the top plate of the prestress applying device corresponding to the connecting piece B; the upper part of the external constraint steel pipe is provided with a cutting-proof rubber pad which is bonded on the upper part of the external constraint steel pipe;
step 2: determining a supporting position, and placing a prestress applying device on a base plate rock body at the corresponding supporting position;
and step 3: inserting the plug-in type top-contacting steel plate into the top end of the inner support steel pipe; taking the axis of the prestress applying device as the circle center, and welding the lower end of the inner support steel pipe on a top plate of the prestress applying device;
and 4, step 4: fixedly connecting the external constraint steel pipe with a top plate of a prestress applying device by using a connecting piece B and a bolt B at the lower end of the external constraint steel pipe; if the external constraint steel pipe is formed by butting two semicircular steel pipes in the axial direction, and then the two butted semicircular steel pipes are fastened into a whole by a bolt A through a connecting piece A;
and 5: and injecting water into the prestress applying device, enabling the expansion material to expand when encountering water, outputting expansion force along the axial direction, enabling the inner support steel pipe and the outer support steel pipe to ascend through a top plate of the prestress applying device, and enabling the upper end of the inner support steel pipe to be tightly attached to a roof of a stope through a roof connecting steel plate and finally to be converted into active supporting force between the roof and a bottom plate.
Step 6: if the external restraint steel pipe is formed by butt joint of two semicircular steel pipes, the external restraint steel pipe which does not bear pressure (the internal support steel pipe is not bent and the external restraint steel pipe is not stressed) can be disassembled and recovered by loosening and screwing down the fastening bolt B and the bolt A after the stope is stoped and before the goaf is filled, and the external restraint steel pipe can be recycled for secondary utilization.
The use method of the active support type yielding bearing support column which is formed by butting two semicircular steel pipes and aims at externally restricting the steel pipes comprises the following steps:
step 1: the prefabricated part: determining the types, wall thicknesses and lengths of the inner support steel pipe and the outer constraint steel pipe according to the compressive stress of surrounding rocks of the stope and the stope height; determining the yielding amount of the strut and the prestress of the prestress applying device according to the distribution condition of the ground stress, the stope span and the properties of the surrounding rock; the external constraint steel pipe is made into an axial direction and is formed by butt joint of two semicircular steel pipes, and a group of connecting pieces A are respectively welded at the upper part and the lower part of the joint of the two semicircular steel pipes; connecting pieces B used for being connected with a top plate of the prestress applying device are respectively welded at the lower ends of the two semicircular steel pipes, and bolt holes used for installing bolts B are formed in the top plate of the prestress applying device corresponding to the connecting pieces B; the upper parts of the two semicircular steel pipes are provided with semicircular arc-shaped cutting-proof rubber pads which are bonded on the upper parts of the semicircular steel pipes;
step 2: determining a supporting position, and placing a prestress applying device on a base plate rock body at the corresponding supporting position;
and step 3: inserting the plug-in type top-contacting steel plate into the top end of the inner support steel pipe; taking the axis of the prestress applying device as the circle center, and welding the lower end of the inner support steel pipe on a top plate of the prestress applying device;
and 4, step 4: the two semicircular steel pipes are respectively and fixedly connected with a top plate of the prestress applying device by utilizing a connecting piece B and a bolt B at the lower ends of the two semicircular steel pipes; then fastening the two butted semicircular steel pipes into a whole by using a bolt A through a connecting piece A;
and 5: injecting water into the prestress applying device, enabling the expansion material to expand when encountering water, outputting expansion force along the axial direction, enabling the inner support steel pipe and the outer constraint steel pipe to ascend through a top plate of the prestress applying device, enabling the upper end of the inner support steel pipe to be tightly attached to a top plate of a stope through a top connecting steel plate, and finally converting the upper end of the inner support steel pipe into active supporting force between the top plate and a bottom plate;
step 6: after stoping the original rock pillar and before filling the goaf, the external restraint steel pipe which does not bear pressure (the internal support steel pipe is not bent and the external restraint steel pipe does not bear pressure) can be disassembled and recovered by loosening and unscrewing the fastening bolt B and the bolt A for secondary utilization.
Compared with the prior art (the artificial ore pillar disclosed by CN 109944615A), the invention has the following beneficial effects:
1. the active support type yielding bearing support column can keep constant ultimate bearing capacity after the inner support steel pipe is greatly deformed, so that long-term yielding support for an excavation space is realized.
2. The invention can realize the graded bearing of the underground excavation space: when the inner support steel pipe reaches the ultimate bearing strength, the stable bearing capacity can be kept through the constraint of the outer constraint steel pipe; when the compression deformation of the inner support steel pipe after bearing is the same as the height of the outer constraint steel pipe, the inner support steel pipe and the outer constraint steel pipe bear together, so that the bearing capacity is enhanced.
3. If the external restraint steel pipe is of a split structure, the external restraint steel pipe can be disassembled and recycled after the original rock pillar is mined in a stope, and the external restraint steel pipe can be repeatedly used, so that the support cost is reduced.
Drawings
FIG. 1 is a perspective view of an embodiment of an actively supported yielding load-bearing support column according to the present invention;
FIG. 2 is an axial cross-sectional view of FIG. 1 taken along the seam of the two semicircular tubes;
FIG. 3 is a top view of FIG. 1 with the plug-in type jacking steel plate removed;
FIG. 4 is a graph of load-displacement curves for an actively supported crush tower.
The symbols in the drawings illustrate that: 1-a plug-in type top-contacting steel plate, 2-an inner support steel pipe, 3-an outer constraint steel pipe, 4-a connecting piece A, 5-a bolt A, 6-a connecting piece B, 7-a bolt B, 8-a top plate of a prestress applying device, 9-the prestress applying device and 10-a cutting-preventing rubber pad.
Detailed Description
The invention is further illustrated by the following figures and examples.
This example is the application of the invention to the stope pillar extraction of a metal mine.
The metal ore belongs to a gently inclined thin ore vein, the ore rock is medium and stable, the thickness of an ore body is 3m on average, the dip angle of the ore body is 5-15 degrees, the traditional room-column method is adopted for stoping the ore body, and the economic loss is large. In order to improve the recovery rate of ores, the active support type yielding bearing support column is adopted to replace the original rock ore pillar reserved in the stope.
With reference to fig. 1, 2 and 3, the active supporting type pre-stress applying device 9 for yielding load-bearing pillars has an active supporting force 1700 KN.; an inner support steel pipe 2 and an outer constraint steel pipe 3 are concentrically and vertically fixedly installed at the center position of a top plate 8 of a prestress applying device, wherein the inner support steel pipe is made of q235 steel, the length of the inner support steel pipe is 2800mm, the outer diameter of the inner support steel pipe is 108mm, and the wall thickness of the inner support steel pipe is 6 mm; the external restraint steel pipe is made of q345 steel, the length of the external restraint steel pipe is 2760mm, the external diameter of the external restraint steel pipe is 159mm, and the wall thickness of the external restraint steel pipe is 6 mm. The lower end of the inner support steel pipe is welded with a top plate 8 of the prestress applying device, and the upper end of the inner support steel pipe is spliced with the splicing type top-contacting steel plate 1. In order to disassemble the external restraint steel pipe after the original rock pillar is mined, the external restraint steel pipe is axially formed by butt joint of two semicircular steel pipes, seven groups of connecting pieces A4 are respectively welded at the upper part and the lower part along the butt joint, four connecting pieces B6 are symmetrically welded at the lower end, and a semicircular arc-shaped cutting-proof rubber pad 10 with the thickness of 2mm and the height of 500mm is adhered on the inner wall of the upper end; bolts B7 pass through bolt holes on the connecting piece B6 and the top plate 8 of the prestress applying device to fixedly connect the two semicircular steel pipes with the top plate 8 of the prestress applying device, and bolts A5 pass through the connecting piece A4 to fasten the two butted semicircular steel pipes into a whole.
When the active support type yielding bearing support column is used, a support position is determined, and a prestress applying device of the support column is placed on a bottom plate rock mass at the support position; then inserting the plug-in type top-contacting steel plate into the upper end of the inner support steel pipe, and welding the lower end of the inner support steel pipe at the center position of a top plate of the prestress applying device; then, a bolt B penetrates through bolt holes in the connecting piece B and a top plate of the prestress applying device to fixedly connect the two semicircular steel pipes with the top plate of the prestress applying device; and then, a bolt A is used for fastening the two butted semicircular steel pipes into a whole through a connecting piece A, so that the installation of the support is completed. After that, water is injected into the prestress applying device, the expansion material expands when encountering water, the expansion force is output along the axial direction, the inner support steel pipe and the outer steel pipe are lifted by the top plate of the prestress applying device, and the upper end of the inner support steel pipe is tightly attached to the top plate of the stope through the top-contacting steel plate and finally is converted into active support between the top plate and the bottom plate. After stoping the original rock pillar and before filling the goaf, the external restraint steel pipe which does not bear pressure is disassembled and recovered by loosening and unscrewing the fastening bolt B and the bolt A for secondary utilization.
Fig. 4 is a load-displacement curve diagram of the energy-absorbing yielding strut in the embodiment, and it can be known that, in the top plate sinking process of the inner support steel pipe, the initial bending process corresponds to the elastic load rising stage; the steel pipe is contacted with an outer constraint steel pipe in the bending process (before the axial displacement is 50 mm), and the outer constraint steel pipe provides radial supporting force for the inner support steel pipe so as to ensure that the bearing capacity of the inner support steel pipe is not changed and corresponds to a curve yielding stage; along with the sinking of the top plate, the top-contacting steel plate is contacted with the top end of the external restraint steel pipe (the axial displacement is 50-55 mm), the bearing capacity is improved, and the curve rigid support stage is corresponded; the top plate continues sinking, the outer constraint steel pipe is bent (the axial displacement is larger than 55mm), the bearing capacity is reduced, and the corresponding curve instability damage stage is realized.
It should be noted that, in the actively supporting yielding load-bearing support column of the present invention, a single support column composed of an inner support steel pipe and an outer constraint steel pipe may be installed on the top plate of the prestress applying device, or a plurality of support columns (the number of support columns is determined according to the magnitude of the ground pressure stress) may be symmetrically installed as in the artificial ore pillar disclosed in CN109944615A, both of which are within the protection scope of the present invention.
Claims (8)
1. An active support type yielding bearing pillar comprises a prestress applying device (9) arranged on a stope floor rock mass; the prestressed steel tube prestressed concrete reinforced concrete beam is characterized in that an inner support steel tube (2) and an outer constraint steel tube (3) are concentrically and vertically fixedly installed at the central position of a top plate (8) of a prestressed concrete; the upper end of the inner support steel pipe is connected with a stope roof rock mass through a plug-in type roof connecting steel plate (1).
2. The actively supported yielding load-bearing column as claimed in claim 1, wherein an annular anti-cutting rubber pad is bonded to the inner wall of the upper end of the outer restraining steel pipe.
3. The actively supported yield load bearing strut of claim 1, wherein: the external constraint steel pipe is formed by butting two semicircular steel pipes in the axial direction, and the joint is fastened by a connecting piece A (4) and a bolt A (5) which are respectively welded on the two semicircular steel pipes; the lower ends of the two semicircular steel pipes are fixedly connected with a top plate (8) of the prestress applying device through a connecting piece B (6) and a bolt B (7) which are welded at the bottom ends of the two semicircular steel pipes.
4. The active support type yielding bearing column as claimed in claim 3, wherein semi-circular arc-shaped cutting-proof rubber pads (10) are respectively bonded on the inner walls of the upper ends of the two semi-circular steel pipes.
5. The method of using an actively supported yielding load-bearing column as claimed in claim 1, comprising the steps of:
step 1: the prefabricated part: determining the types, wall thicknesses and lengths of the inner support steel pipe and the outer constraint steel pipe according to the compressive stress of surrounding rocks of the stope and the stope height; determining the yielding amount of the strut and the prestress of the prestress applying device according to the distribution condition of the ground stress, the stope span and the properties of the surrounding rock; welding a connecting piece B used for being connected with a top plate of the prestress applying device at the lower end of the external constraint steel pipe, and arranging a bolt hole used for installing a bolt B on the top plate of the prestress applying device corresponding to the connecting piece B;
step 2: determining a supporting position, and placing a prestress applying device on a base plate rock body at the corresponding supporting position;
and step 3: inserting the plug-in type top-contacting steel plate into the top end of the inner support steel pipe; taking the axis of the prestress applying device as the circle center, and welding the lower end of the inner support steel pipe on a top plate of the prestress applying device;
and 4, step 4: fixedly connecting the external constraint steel pipe with a top plate of a prestress applying device by using a connecting piece B and a bolt B at the lower end of the external constraint steel pipe;
and 5: and injecting water into the prestress applying device, enabling the expansion material to expand when encountering water, outputting expansion force along the axial direction, enabling the inner support steel pipe and the outer support steel pipe to ascend through a top plate of the prestress applying device, and enabling the upper end of the inner support steel pipe to be tightly attached to a roof of a stope through a roof connecting steel plate and finally to be converted into active supporting force between the roof and a bottom plate.
6. The method for using the actively supported yielding load-bearing support column as claimed in claim 2, wherein step 1 is to add an anti-cutting rubber pad to the upper part of the outer constraint steel pipe in the step of claim 6, and the rest steps are the same as the steps of claim 6.
7. The method of using an actively supported yielding load-bearing column as claimed in claim 3, comprising the steps of:
step 1: the prefabricated part: determining the types, wall thicknesses and lengths of the inner support steel pipe and the outer constraint steel pipe according to the compressive stress of surrounding rocks of the stope and the stope height; determining the yielding amount of the strut and the prestress of the prestress applying device according to the distribution condition of the ground stress, the stope span and the properties of the surrounding rock; the external constraint steel pipe is made into an axial direction and is formed by butt joint of two semicircular steel pipes, and a group of connecting pieces A are respectively welded at the upper part and the lower part of the joint of the two semicircular steel pipes; connecting pieces B used for being connected with a top plate of the prestress applying device are respectively welded at the lower ends of the two semicircular steel pipes, and bolt holes used for installing bolts B are formed in the top plate of the prestress applying device corresponding to the connecting pieces B;
step 2: determining a supporting position, and placing a prestress applying device on a base plate rock body at the corresponding supporting position;
and step 3: inserting the plug-in type top-contacting steel plate into the top end of the inner support steel pipe; taking the axis of the prestress applying device as the circle center, and welding the lower end of the inner support steel pipe on a top plate of the prestress applying device;
and 4, step 4: the two semicircular steel pipes are respectively and fixedly connected with a top plate of the prestress applying device by utilizing a connecting piece B and a bolt B at the lower ends of the two semicircular steel pipes; then fastening the two butted semicircular steel pipes into a whole by using a bolt A through a connecting piece A;
and 5: injecting water into the prestress applying device, enabling the expansion material to expand when encountering water, outputting expansion force along the axial direction, enabling the inner support steel pipe and the outer constraint steel pipe to ascend through a top plate of the prestress applying device, enabling the upper end of the inner support steel pipe to be tightly attached to a top plate of a stope through a top connecting steel plate, and finally converting the upper end of the inner support steel pipe into active supporting force between the top plate and a bottom plate;
step 6: after stoping the original rock pillar and before filling the goaf, the external restraint steel pipe which does not bear pressure (the internal support steel pipe is not bent and the external restraint steel pipe does not bear pressure) can be disassembled and recovered by loosening and unscrewing the fastening bolt B and the bolt A for secondary utilization.
8. The method for using the actively supported yielding load-bearing support column as claimed in claim 4, wherein step 1 is to add a semi-circular arc-shaped anti-cutting rubber pad respectively adhered to the upper parts of the two semi-circular steel pipes in step 1 of claim 7, and the rest steps are the same as the steps of claim 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111096688.4A CN113738409B (en) | 2021-09-18 | 2021-09-18 | Active support type yielding bearing support column and use method thereof |
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| CN202111096688.4A CN113738409B (en) | 2021-09-18 | 2021-09-18 | Active support type yielding bearing support column and use method thereof |
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| CN109944615A (en) * | 2019-04-18 | 2019-06-28 | 东北大学 | A kind of underground supporting manually ore pillar and erection method |
| CN112324478A (en) * | 2020-11-23 | 2021-02-05 | 东北大学 | Roadway U-shaped support device and method |
| CN112682077A (en) * | 2020-12-31 | 2021-04-20 | 山东建筑大学 | Mining anti-impact three-column parallel type retractable pier column structure with active roof connection, supporting system and construction method |
| CN113187519A (en) * | 2021-06-01 | 2021-07-30 | 重庆大学 | Variable prestress supporting method for controlling deformation of tunnel excavation surrounding rock mass |
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2021
- 2021-09-18 CN CN202111096688.4A patent/CN113738409B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105040849A (en) * | 2015-07-20 | 2015-11-11 | 清华大学 | Prestressed concrete-filled steel tube buckling-restrained supporting member |
| CN109184758A (en) * | 2018-08-21 | 2019-01-11 | 长春黄金研究院有限公司 | A kind of Monodirectional piston stope support device and method for protecting support |
| CN109944615A (en) * | 2019-04-18 | 2019-06-28 | 东北大学 | A kind of underground supporting manually ore pillar and erection method |
| CN112324478A (en) * | 2020-11-23 | 2021-02-05 | 东北大学 | Roadway U-shaped support device and method |
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| CN113738409B (en) | 2022-06-24 |
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